ACDIS CCDS Dumps

The most clinically supported clarification is acute cerebral infarction. A transient ischemic attack is characterized by transient neurologic dysfunction without acute infarction. In this scenario, the patient's slurred speech has resolved, but the right-sided weakness persists, and CT demonstrates a new hypodense cerebral area. Together, those findings raise substantial concern for an established ischemic infarction rather than a completely transient event.

The CDI specialist should not independently convert the diagnosis of TIA to cerebral infarction. Instead, the persistent focal deficit and imaging findings establish an appropriate clinical basis for a provider query asking whether the final diagnosis is acute cerebral infarction, TIA, another neurologic condition, or clinically undetermined.

Acute encephalopathy generally produces global cerebral dysfunction rather than the focal unilateral weakness described here. Transient global amnesia predominantly affects memory formation and would not explain persistent unilateral motor deficits. Transient cerebral ischemia/TIA becomes less consistent once objective evidence of acute infarction and persistent neurologic impairment is present.

Accurate clarification is important because cerebral infarction and TIA differ substantially in coding, severity representation, quality reporting, and secondary-prevention planning.

CCDS Reference Topics: Neurologic clinical indicators; cerebral infarction versus TIA; diagnostic clarification; medical record specificity.

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The CDI specialist should clarify the clinical significance and relationship to the procedure. Not every condition occurring after surgery constitutes a complication of care, and mechanical ventilation itself does not establish postoperative respiratory failure.

Major operations often require planned postoperative ventilatory support because of anesthesia, surgical duration, hemodynamic status, or other expected recovery needs. Conversely, unexpected inability to extubate, severe hypoxemia or hypercapnia, escalating ventilatory support, or other clinical deterioration may support a genuine postoperative respiratory complication.

ICD-10-CM complication reporting requires careful attention to provider documentation of the relationship between the condition and the procedure. The FY 2026 Official Guidelines emphasize that the fact a condition occurs after a procedure is not, by itself, sufficient to classify it as a complication.

Option A therefore assumes a complication that may not exist. Option C improperly alters provider documentation without clarification. Option D mistakes treatment for diagnosis.

A compliant query should objectively present respiratory findings, duration of ventilation, reintubation or escalation when present, and the operative/anesthesia documentation, then allow the provider to characterize the condition.

CCDS Reference Topics: Postoperative respiratory failure; complications of care; mechanical ventilation; clinical validation.

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ICD-10-CM permits the NIH Stroke Scale score to be reported from documentation by an appropriate clinician other than the provider responsible for establishing the diagnosis. The underlying stroke diagnosis itself must be appropriately documented by the provider.

This is similar to other specified exceptions such as BMI, pressure-ulcer stage, coma scale values, and certain additional clinical elements for which qualified non-provider documentation may support code assignment.

The exception does not mean that a stroke nurse can independently establish cerebral infarction for coding. Rather, once the provider has documented the stroke, the nurse's formal NIHSS assessment can supply the standardized severity measurement.

This approach recognizes that specially trained clinical professionals routinely collect and document these structured measurements as part of patient care.

If multiple NIHSS values are documented, the applicable coding instructions and timing requirements should be followed rather than simply selecting the highest score because it produces a different code.

For CDI professionals, awareness of these non-provider documentation exceptions prevents unnecessary physician queries while ensuring that important severity information is not lost.

CCDS Reference Topics: NIH Stroke Scale; cerebral infarction; non-provider documentation; coding exceptions; stroke severity.

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The CDI specialist should clarify whether the urinary retention represents an actual postoperative complication or an expected consequence of surgery/anesthesia.

ICD-10-CM does not classify every condition that occurs after medical or surgical care as a complication. Provider documentation must establish the appropriate relationship when required, and the condition should represent more than an expected physiologic consequence.

Temporary urinary retention can occur after anesthesia, opioid administration, pelvic surgery, or immobilization. Its appearance following surgery therefore does not automatically establish a complication of care.

The query should objectively present the postoperative urinary retention, catheterization, duration, treatment, and any surgeon or anesthesia documentation indicating whether the event was expected. The provider can then characterize the condition appropriately.

Automatically assigning a device-related complication would introduce another unsupported causal relationship. CDI also cannot delete the documented condition simply because it may be expected.

This distinction is important because complication codes can influence MS-DRG assignment, quality reporting, patient-safety analyses, and public performance information. Accurate characterization is therefore essential.

CCDS Reference Topics: Complications of care; postoperative urinary retention; cause-and-effect relationship; clinical clarification.

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CMS PSI 90, the Patient Safety and Adverse Events Composite, is one of the six measures used in the FY 2026 HAC Reduction Program.

CMS states that the program uses one claims-based patient-safety composite—PSI 90—plus five healthcare-associated infection measures: CLABSI, CAUTI, colon and abdominal hysterectomy surgical-site infection, MRSA bacteremia, and C. difficile infection.

Case mix index is an MS-DRG resource-intensity statistic and is not a HACRP quality measure. Query-response rate is an internal CDI performance metric. Patient-experience measures belong to other CMS quality frameworks, including Hospital VBP, rather than constituting a HACRP measure.

For FY 2026, hospitals with Total HAC Scores above the 75th percentile—effectively the worst-performing quartile—are subject to a 1% payment reduction under the program.

A CDI specialist should also distinguish HACRP from the separate HAC/POA payment provision. CMS explicitly identifies them as distinct programs, even though both involve hospital-acquired conditions.

CCDS Reference Topics: HACRP; PSI 90; healthcare-associated infections; patient safety; quality reimbursement.

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The FY 2026 ICD-10-CM Official Guidelines specifically address a pressure ulcer that progresses to a higher stage during an inpatient admission. Two codes are assigned: one representing the site and stage present on admission and another representing the same ulcer site at the highest stage documented during the hospitalization.

Therefore, this patient's stage 2 sacral pressure ulcer on admission and subsequent progression to stage 3 must both be represented according to the applicable coding instructions.

The distinction is important for both clinical and quality purposes because the record must accurately show what condition existed when the patient entered the hospital and how the wound subsequently evolved. Coding only the stage 3 ulcer would lose information about its status at admission. Coding only stage 2 would fail to represent the deterioration that occurred during the stay.

Pressure-ulcer staging is also one of the circumstances in which qualified non-provider clinician documentation, such as wound-care nursing documentation, may be used to establish stage when the diagnosis itself is appropriately documented.

For CDI, accurate wound location, stage, progression, and POA documentation are essential because advanced pressure injuries may influence MS-DRG severity and hospital quality reporting.

CCDS Reference Topics: Pressure ulcers; staging; POA; wound-care documentation; Official Guidelines.

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The CDI specialist should first review the final coded record together with the Coding Clinic guidance identified by the coder. This provides an objective basis for understanding why the final MS-DRG differs from the CDI working DRG.

A mismatch does not automatically indicate that either CDI or coding made an error. Working DRGs are provisional and may change after complete review of discharge documentation, operative reports, pathology, final diagnostic information, coding conventions, official guidelines, or authoritative Coding Clinic advice.

Reviewing the applicable guidance before contacting the coder promotes an informed and efficient reconciliation process. Once the specialist understands the coding rule, discussion with the coder may still be useful if ambiguity remains. Immediately escalating to the coding manager is unnecessary unless the issue cannot be resolved through normal collaboration. Forwarding the record without investigating the mismatch would defeat the purpose of a reconciliation process and could allow recurring education opportunities to remain unidentified.

Mismatch analysis is a valuable CDI quality metric because it can identify documentation gaps, coding-knowledge issues, changes in authoritative guidance, and opportunities to improve CDI/coding alignment.

CCDS Reference Topics: MS-DRG reconciliation; CDI/coder collaboration; Coding Clinic application; CDI program analysis.

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A multiple-choice query is appropriate when clinical indicators support the possibility of a condition but the diagnosis itself has not yet been documented. The query may present clinically reasonable diagnostic choices supported by the patient's record while also allowing an alternative response such as “other, please specify” or an inability to determine.

A yes/no query is not the appropriate format for introducing a new, previously undocumented diagnosis. AHIMA/ACDIS guidance has specifically distinguished this situation from circumstances where yes/no clarification may be used for an already documented condition, POA determination, cause-and-effect clarification, or similar defined purposes.

A clinical-validation query addresses the opposite problem: a diagnosis is already documented, but the health record appears to lack sufficient clinical support for that diagnosis. Therefore, option C does not match the scenario.

A cause-and-effect query would be appropriate when two documented conditions require clarification of their relationship, not when the fundamental issue is the absence of a diagnosis.

Current AHIMA/ACDIS guidance continues to permit multiple-choice queries supported by relevant clinical indicators and emphasizes neutral wording.

CCDS Reference Topics: Compliant query formats; missing diagnosis; clinical validation; nonleading queries.

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The phrase “post-op ileus” establishes that the ileus occurred after surgery, but it does not necessarily establish that the ileus represents a reportable surgical complication rather than an expected transient consequence of abdominal surgery. The relationship and clinical significance therefore require clarification.

ICD-10-CM guidance on complications of care states that not every condition occurring during or following surgery is automatically classified as a complication. Code assignment depends on provider documentation establishing the relationship between the condition and the care or procedure, and the documentation must support clinical significance. When that relationship is unclear, the provider should be queried.

Assigning a complication code immediately would therefore be premature. Likewise, simply coding postoperative ileus without resolving whether it represents expected postoperative physiology or a clinically significant complication could misrepresent the episode.

Escalation to a physician advisor or CDI manager is unnecessary as the first action because this is a standard documentation-clarification issue that can be addressed directly through a compliant provider query.

CCDS Reference Topics: Official Guidelines—complications of care; medical record documentation; compliant provider clarification.

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The clinically meaningful documentation gap concerns what condition actually occasioned the inpatient admission and whether the altered mental status represents a defined diagnosis associated with the episode. The record identifies a UTI due to E. coli, but the patient also presented with AMS significant enough to undergo head CT evaluation. The AMS subsequently resolved to baseline.

A creatinine of 1.2 mg/dL alone does not establish acute kidney injury because AKI requires evidence of an acute change from baseline and appropriate clinical context. Similarly, sodium of 146 mEq/L is only minimally elevated and, without clinical evaluation or treatment demonstrating significance, does not justify a query designed to generate hypernatremia.

Merely clarifying AMS as acute versus chronic is also less useful than determining the actual diagnosis explaining the altered mental state and its relationship to the admission. Depending on provider judgment and supporting evidence, possibilities could include an acute encephalopathic process, delirium, symptoms associated with infection, or another condition.

The query should remain neutral and should not presume that the UTI caused the AMS.

CCDS Reference Topics: Principal diagnosis clarification; AMS; clinical indicators; query prioritization; documentation integrity.

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The most effective intervention is targeted, service-line-specific physician education based on actual documentation trends and clinically relevant examples.

Repeated queries for the same issue usually indicate a systematic documentation opportunity rather than isolated provider mistakes. Education should therefore show cardiologists how documentation of heart-failure type—such as systolic, diastolic, or combined—and acuity—acute, chronic, or acute on chronic—communicates the patient's clinical condition more precisely.

Using deidentified examples from the service line makes the education immediately relevant and enables physicians to recognize which clinical circumstances frequently generate clarification. Aggregate query data can demonstrate where documentation gaps occur without criticizing individual providers.

Sending an entire code book places coding responsibility on physicians and is unlikely to change documentation behavior. Stopping queries leaves unresolved clinical ambiguity. Framing the education around reduced reimbursement is also inappropriate because the goal of CDI education is accurate clinical representation, not coaching physicians toward higher-paying diagnoses.

The 2026 ACDIS/AHIMA query guidance identifies accurate representation of the patient's clinical status as the underlying purpose of CDI clarification.

CCDS Reference Topics: Physician education; communication; heart-failure specificity; query trend analysis.

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PACT stands for Post-Acute Care Transfer. The PACT policy is part of Medicare's IPPS transfer-payment framework and can modify the normal full MS-DRG payment when a qualifying inpatient stay ends with an early transfer or discharge to specified post-acute settings.

CMS applies transfer-payment methodology when applicable conditions are met, including circumstances involving selected discharges to skilled nursing facilities, inpatient rehabilitation facilities, long-term care hospitals, psychiatric facilities, and certain home-health arrangements. For home health, the timing and relationship of post-discharge care can be relevant.

The policy exists because a short acute-care hospitalization followed by transfer to another care setting may not involve the same hospital resource utilization as a conventional discharge completing the expected course of inpatient treatment. Accordingly, the transferring hospital may receive a calculated transfer payment rather than the unrestricted full MS-DRG amount.

For CDI professionals, PACT illustrates why accurate discharge disposition and documentation can affect reimbursement even when the principal diagnosis, procedures, CCs, and MCCs are correctly captured.

CCDS Reference Topics: IPPS; MS-DRG reimbursement; discharge disposition; transfer payment policy.

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For excisional debridement, documentation of the deepest tissue level actually removed is essential for accurate ICD-10-PCS procedure assignment. Relevant levels may include skin, subcutaneous tissue, fascia, muscle, or bone.

The presence of a deep wound does not establish that debridement reached the deepest anatomical layer visible in the wound. For example, a wound may extend to muscle while the physician removes only necrotic subcutaneous tissue. Coding must reflect the body part and tissue actually debrided rather than the overall depth of the wound.

Therefore, the CDI specialist should clarify what tissue was excised. Other procedural elements may already be supported by the operative documentation, including the excisional nature of the procedure.

The number of instruments or duration of anesthesia does not determine the applicable body-part value. Similarly, administrative details have no bearing on procedural specificity.

CDI specialists working with surgical records must understand the distinction between wound description and procedure performance. Accurate procedural documentation can affect ICD-10-PCS coding and ultimately MS-DRG assignment, particularly when an operating-room procedure influences grouper logic.

The CCDS competency framework includes medical-record review and coding/payment implications of inpatient procedures.

CCDS Reference Topics: Excisional debridement; ICD-10-PCS; tissue depth; operative documentation.

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The most appropriate clarification concerns the underlying cause/type of pneumonia. The record documents “HCAP,” but that term does not identify a specific causative organism or pathophysiologic pneumonia type. The patient is being actively treated with antibiotics, has leukocytosis, and was admitted with pneumonia-related documentation, creating a legitimate opportunity to clarify clinically supported specificity.

The other options are weaker. Hemoglobin of 9.0 supports anemia but does not establish acute blood loss anemia without evidence of active/recent blood loss or an acute decline. Sodium of 134 mEq/L is only mildly reduced and, without treatment or other clinical significance, does not by itself justify seeking a diagnosis solely from the laboratory value.

The record already specifies diastolic heart failure. Although acuity could sometimes warrant clarification, the presented findings do not strongly establish acute decompensated heart failure: oxygen requirement is modest, saturation is 98%, and no pulmonary edema, diuretic escalation, or other acute HF indicators are provided.

The query should remain neutral and allow the provider to identify the pneumonia type only if clinically determinable.

CCDS Reference Topics: Pneumonia specificity; clinical indicators; documentation clarification; query prioritization.

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A verbal query is the most efficient and appropriate action because the responsible physician is immediately available and the documentation gap has already been identified. CDI practice is not limited to written or electronic queries; verbal clarification is an accepted communication method when conducted compliantly.

The CDI specialist should present the relevant clinical indicators objectively and ask for clarification without directing the physician toward a preferred diagnosis. The conversation should remain clinically focused and must not mention reimbursement, MS-DRG impact, quality scoring, or other incentives.

Importantly, verbal does not mean informal or undocumented. Current query standards require organizations to maintain an auditable query process. Historically, ACDIS/AHIMA guidance has specifically required the essence of verbal queries to be memorialized, including the reason for clarification and relevant clinical indicators. The 2026 ACDIS/AHIMA Guidelines for Achieving a Compliant Query Practice supersede previous versions and remain the current foundational industry standard for query practice.

Waiting unnecessarily could delay clarification and interfere with concurrent CDI workflow. Since the physician is available, direct professional communication is preferable.

CCDS Reference Topics: Communication skills; verbal queries; concurrent CDI review; compliant query practice.

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When all four Hospital VBP domains are scored, each domain contributes 25% of the hospital's Total Performance Score.

For FY 2026, the four domains are Clinical Outcomes, Person and Community Engagement, Safety, and Efficiency and Cost Reduction. CMS's Provider Data Catalog confirms that each contributes one-quarter of the Total Performance Score under the standard four-domain configuration.

The Clinical Outcomes domain includes mortality and complication measures. Person and Community Engagement incorporates HCAHPS patient-experience dimensions. The Safety domain contains healthcare-associated infection and safety-related measures, while Efficiency and Cost Reduction incorporates Medicare spending measures.

If a hospital receives valid scores in only three domains, CMS proportionately reweights the scored domains rather than simply assigning zero to the missing domain.

For CCDS practice, understanding these domains helps explain why accurate documentation influences more than MS-DRG reimbursement. Clinical documentation can affect severity adjustment, complications analysis, mortality calculations, and the reliability of administrative data used in performance measurement.

CCDS Reference Topics: Hospital VBP; Total Performance Score; quality domains; risk adjustment; hospital performance.

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The CDI specialist should query the provider regarding the cause-and-effect relationship between the urinary catheter and the infection. The simultaneous presence of a catheter and UTI does not, by itself, establish a device-related complication for coding.

A positive culture, pyuria, and fever may support infection, but attribution to an indwelling catheter requires appropriate provider documentation when the classification does not independently establish the relationship.

The query should present relevant facts neutrally: catheter placement and duration, fever, urinary symptoms when present, urinalysis, culture findings, antibiotic treatment, and existing UTI documentation. Possible responses should allow the physician to identify catheter-associated UTI, UTI unrelated to the catheter, another diagnosis, or inability to determine.

Option A improperly infers causation. Option C goes too far in the opposite direction; although asymptomatic bacteriuria is common in catheterized patients, the provider has documented UTI and the patient has clinical findings that may support infection. Option D similarly equates a test result with a complication diagnosis.

This is a classic CCDS cause-and-effect clarification issue and demonstrates why device-related complications require careful documentation.

CCDS Reference Topics: CAUTI; device-related complications; cause-and-effect queries; clinical indicators; quality reporting.

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When sepsis due to a localized infection is responsible for the admission, the systemic infection is generally sequenced first, followed by the localized infection. If acute organ dysfunction is documented as associated with the sepsis, severe sepsis coding additionally requires the appropriate R65.2- code and code(s) for the acute organ dysfunction.

The severe-sepsis code itself is not sequenced as principal diagnosis. The underlying systemic infection precedes it. In this case, the patient's AKI has specifically been linked to sepsis, supporting the severe-sepsis framework.

Pneumonia remains important because it identifies the localized source of infection, but it does not generally precede the systemic infection when sepsis is present on admission and is responsible for the hospitalization.

The CDI specialist should verify that the documentation clearly establishes the relationship between the acute organ dysfunction and sepsis. Organ dysfunction occurring in a patient with sepsis is not automatically attributable to sepsis when another cause is documented or clinically plausible.

The FY 2026 ICD-10-CM Official Guidelines govern these sequencing principles.

CCDS Reference Topics: Sepsis; severe sepsis; principal diagnosis; acute organ dysfunction; sequencing.

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When a patient is admitted specifically for treatment of a documented postoperative complication, the complication is generally sequenced as the principal diagnosis when it is established after study to be chiefly responsible for the admission.

In this scenario, the surgeon has explicitly documented the wound infection as a complication of the prior procedure, and treatment of that complication is the reason for the current hospitalization. The original surgical disease therefore does not automatically remain the principal diagnosis simply because it led to the earlier operation.

Fever and abdominal pain are clinical manifestations or symptoms and ordinarily are not sequenced ahead of the definitive postoperative infection once that condition has been established.

A critical CDI principle is that a temporal relationship alone is insufficient to classify a postoperative condition as a complication. The provider must establish the appropriate relationship when required by ICD-10-CM. Here, that documentation is already present, so a query simply asking whether the infection is postoperative would be unnecessary.

The principal-diagnosis decision should still account for all applicable complication-code sequencing instructions and circumstances of admission. The FY 2026 Official Guidelines emphasize both principal-diagnosis rules and requirements surrounding complications of care.

CCDS Reference Topics: Principal diagnosis; postoperative complications; complications of care; sequencing.

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A significant mismatch rate should trigger structured CDI/coding reconciliation, not an assumption that either department is wrong.

Working MS-DRGs are provisional. Final coding may change because of discharge-summary diagnoses, operative reports, pathology results, late physician clarification, Coding Clinic guidance, sequencing conventions, final procedure coding, CC/MCC exclusions, or other grouper logic unavailable during the concurrent CDI review.

The manager should categorize mismatch causes. Useful categories include principal-diagnosis differences, missed secondary diagnoses, procedure-code differences, coding-guideline interpretation, query results, discharge documentation, and technical grouper issues.

Patterns can then identify whether education is needed for CDI specialists, coding professionals, physicians, or multiple groups.

Requiring coding staff to adopt the CDI working DRG would undermine coding independence and final coding accountability. Excluding mismatches from metrics would conceal an important quality indicator.

CMS confirms that the FY 2026 MS-DRG Definitions Manual contains the complete grouper logic for Version 43.1, making current grouper rules essential when evaluating discrepancies.

CCDS Reference Topics: MS-DRG reconciliation; CDI/coder agreement; program analysis; education; grouper logic.

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When an inpatient encounter is solely for administration of chemotherapy, the encounter-for-chemotherapy code is generally sequenced first, followed by the code identifying the malignancy being treated.

This represents an important exception to the usual expectation that the underlying disease is the principal diagnosis. The circumstances of admission are specifically treatment administration rather than management of an acute complication of the malignancy.

If, however, the patient were admitted because of a complication—such as chemotherapy-induced neutropenic fever, dehydration, anemia, or another adverse effect—the principal-diagnosis analysis would follow the applicable guideline for that condition rather than automatically using the chemotherapy encounter code.

Similarly, if chemotherapy were administered incidentally during a hospitalization principally required for another condition, the encounter-for-chemotherapy code would not displace the actual principal diagnosis.

CDI professionals should therefore distinguish planned treatment encounters from admissions caused by complications of treatment or malignancy.

Clear documentation regarding the reason for admission, cancer site, treatment intent, metastatic disease, and complications helps support proper sequencing and accurate oncology data.

CCDS Reference Topics: Antineoplastic chemotherapy; encounter codes; neoplasm sequencing; principal diagnosis; oncology documentation.

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ICD-10-CM Chapter 15 codes generally have sequencing priority over codes from other chapters when a condition complicates pregnancy, childbirth, or the puerperium.

Therefore, when pyelonephritis complicates pregnancy, the appropriate obstetric complication code is generally sequenced first, with additional code(s) used as instructed to identify the specific infection or organism.

This principle is important because ordinary principal-diagnosis logic can be modified by chapter-specific instructions. CDI specialists working with obstetric cases therefore must determine whether the pregnancy affects management and whether the condition is documented as complicating pregnancy.

The only major exception would be when the provider specifically determines that the pregnancy is incidental to the encounter and the applicable coding requirements for incidental pregnancy are met.

A symptom code does not generally supersede an established definitive diagnosis. Likewise, the fact that an infection could occur outside pregnancy does not negate Chapter 15 sequencing when it is complicating the pregnancy.

Correct gestational-age documentation is also important because an additional code may be required to identify the specific week of gestation.

CCDS Reference Topics: Obstetric coding; Chapter 15; sequencing priority; infection in pregnancy; principal diagnosis.

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POA indicator W means the provider is clinically unable to determine whether the condition was present on admission. That is precisely what is documented in this scenario.

This must be distinguished from POA indicator U. U means the documentation is insufficient to determine POA status, whereas W reflects an actual clinical determination that the timing cannot be established even after appropriate assessment.

Indicator Y means the condition was present when the inpatient admission order occurred, while N means it was not present at that point.

This distinction matters because POA status contributes to CMS Hospital-Acquired Condition payment logic and hospital quality analyses. CDI specialists should attempt to obtain clarification when timing is unclear, but they must accept a legitimate provider determination that onset cannot clinically be established.

Not every ambiguous timeline should be forced into either Y or N. When clinical evidence truly cannot resolve the timing, W is an appropriate reporting outcome.

CMS maintains separate annual POA-exempt resources and HAC/POA coding information for the applicable fiscal year.

CCDS Reference Topics: POA indicators; W versus U; onset timing; HACs; inpatient coding.

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The Hospital-Acquired Condition Reduction Program (HACRP) imposes a 1% reduction in applicable Medicare fee-for-service payments on subsection (d) hospitals ranking in the worst-performing quartile based on the Total HAC Score.

For the current program, CMS uses six measures: the CMS Patient Safety and Adverse Events Composite (PSI 90) and five healthcare-associated infection measures—CLABSI, CAUTI, specified surgical-site infection, MRSA bacteremia, and C. difficile infection.

HACRP must be distinguished from the separate DRA Hospital-Acquired Condition/Present-on-Admission payment provision. CMS explicitly states that these are different programs.

Hospital Value-Based Purchasing also links quality performance with hospital payment, but its structure is different: it is funded through a 2% reduction of participating hospitals' base operating DRG payments that is redistributed through value-based incentives.

For CDI professionals, accurate clinical documentation helps ensure that quality data appropriately represent the patient's condition and hospital course. CDI should not attempt to suppress valid complications or create unsupported comorbidities to change quality performance.

CCDS Reference Topics: HACRP; PSI 90; HAIs; quality reimbursement; CMS quality programs.

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The findings create a strong clarification opportunity for hepatic encephalopathy. Cirrhosis, altered mental status, asterixis, elevated ammonia, and improvement with lactulose collectively support an encephalopathic process related to hepatic dysfunction.

The CDI specialist should not independently diagnose hepatic encephalopathy from the findings. Instead, the physician should be asked to clarify the condition represented by the documented phrase “altered mental status due to liver disease.”

Hepatic encephalopathy is clinically more specific than a nonspecific symptom such as altered mental status and has a distinct ICD-10-CM classification. Elevated ammonia alone is not sufficient to establish the diagnosis because ammonia levels do not always correlate directly with the severity of encephalopathy. The entire clinical picture must be considered.

Dementia generally represents a chronic neurocognitive disorder and does not adequately explain the acute presentation. Alcohol withdrawal requires an appropriate history of cessation or reduction plus characteristic withdrawal manifestations. Metabolic acidosis concerns acid-base physiology and is not supported by the described findings.

This is an example of CDI moving documentation from a nonspecific symptom to a clinically meaningful diagnosis without directing the provider to a predetermined answer.

CCDS Reference Topics: Hepatic encephalopathy; cirrhosis; neurologic manifestations; clinical indicators; documentation specificity.

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A clinical validation query is appropriate because the documented diagnosis appears inconsistent with the available clinical evidence. The creatinine values remain essentially unchanged, urine output is normal, and there is no apparent treatment or monitoring consistent with acute renal dysfunction.

The CDI specialist cannot simply delete the diagnosis because providers are responsible for establishing diagnoses. Conversely, a diagnosis should not automatically be accepted when substantial clinical evidence raises a legitimate question about its validity.

A compliant query would present the documented AKI together with the pertinent renal findings and request clarification. The provider could confirm AKI and provide supporting clinical reasoning, revise the diagnosis, state that it was ruled out, or document another condition.

Assigning chronic kidney disease would be equally inappropriate because CKD requires evidence of chronic kidney abnormality and cannot be inferred from these laboratory values.

The August 2026 ACDIS/AHIMA query guidance supersedes prior versions and remains the foundational standard for clinical validation and documentation clarification.

Clinical validation protects data integrity because diagnoses influence reimbursement, quality reporting, severity measurement, utilization analysis, and downstream patient information.

CCDS Reference Topics: Clinical validation; AKI; unsupported diagnoses; provider clarification; compliance.

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Severe protein-calorie malnutrition is the correct answer. This question is adapted from an official CCDS sample question published by ACDIS.

Under the FY 2026 MS-DRG Definitions Manual, E43, unspecified severe protein-calorie malnutrition, is classified as an MCC. In contrast, moderate and mild protein-calorie malnutrition codes are classified as CCs rather than MCCs.

An MCC can materially affect MS-DRG assignment when the applicable DRG family differentiates cases by MCC status and when no exclusion or other grouper rule prevents the effect. However, the financial effect is never sufficient justification for a query. Documentation must be clinically supported and reflect the patient's actual condition.

A dietitian may document detailed nutrition findings and malnutrition criteria, but the reportable diagnosis ordinarily requires documentation by the provider responsible for establishing diagnoses. Therefore, when strong nutritional indicators exist but the provider has not documented malnutrition, a compliant query may be appropriate.

For CCDS preparation, candidates should understand both the clinical characteristics of malnutrition and its coding/reimbursement classification.

CCDS Reference Topics: MCCs; malnutrition; MS-DRG methodology; documentation requirements; IPPS.

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Vascular dementia is the correct answer. CMS MS-DRG logic places qualifying vascular dementia diagnoses from category F01.- within MS-DRG 884, Organic Disturbances and Intellectual Disability. The FY 2026 CMS MS-DRG Definitions Manual specifically lists vascular dementia codes among the principal diagnoses assigned to MS-DRG 884.

MS-DRG assignment depends on the principal diagnosis code, major diagnostic category, procedures when applicable, and other grouper logic. Therefore, clinically related forms of dementia do not necessarily group to the same MS-DRG. Alzheimer's disease is classified primarily as a neurologic degenerative disorder and requires appropriate dementia manifestations where applicable. Alcohol-induced dementia is classified within substance-related mental and behavioral disorders, while Wernicke encephalopathy is associated with thiamine deficiency and follows different classification logic.

For CCDS practice, this question illustrates why documentation of dementia etiology and type matters. Simply documenting “dementia” can produce a less specific code and may affect MS-DRG assignment, risk adjustment, severity representation, and quality data.

The CDI specialist should seek clarification only when the clinical record supports a more specific dementia type.

CCDS Reference Topics: MS-DRG assignment; mental disorders; dementia specificity; IPPS reimbursement.

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The documented acute mental-status change associated with systemic infection creates a reasonable clarification opportunity for acute metabolic encephalopathy, assuming the complete clinical record supports that diagnosis.

Encephalopathy represents diffuse cerebral dysfunction arising from systemic, metabolic, toxic, hypoxic, infectious, or other causes. Acute confusion, impaired attention, fluctuating cognition, and absence of a focal lesion can support an encephalopathic process.

However, the CDI specialist cannot convert “altered mental status” into encephalopathy independently. The provider must determine whether the patient's presentation represents metabolic encephalopathy, delirium, medication effect, dementia, another neurologic condition, or simply a nonspecific symptom.

Chronic dementia does not fit the acute fluctuating pattern unless underlying dementia is separately documented. Cerebral infarction would generally require compatible focal neurologic findings and clinical or imaging evidence. Transient global amnesia typically presents with prominent acute memory disturbance rather than generalized encephalopathy.

A compliant query should include the mental-status findings, infectious process, relevant laboratory data, neurologic evaluation, treatment, and clinical course.

CCDS Reference Topics: Encephalopathy; altered mental status; infection; neurologic clinical indicators; diagnostic clarification.

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For an inpatient discharge, a diagnosis documented as “probable” may be coded as though the condition existed or was established when it remains documented as such at discharge.

The FY 2026 ICD-10-CM Official Guidelines provide a specific inpatient rule for uncertain diagnoses documented at the time of discharge. Terms such as probable, suspected, likely, questionable, possible, still to be ruled out, compatible with, and consistent with are coded as if the condition existed, because the diagnostic workup and treatment generally correspond to the suspected condition.

Therefore, aspiration pneumonia—not merely the respiratory symptoms—is the appropriate condition to code in this scenario.

This rule is specific to inpatient hospital coding and should not be generalized to outpatient encounters, where uncertain diagnoses are handled differently and symptoms or confirmed conditions are generally reported instead.

A query would still be appropriate if the documentation were contradictory, clinically ambiguous, or if multiple competing diagnoses remained without sufficient clarification. But the word “probable” itself does not create a mandatory inpatient query.

CCDS Reference Topics: Inpatient uncertain diagnoses; aspiration pneumonia; discharge documentation; Official Guidelines.

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Among the listed diagnoses, acute diastolic heart failure has the greatest potential MS-DRG impact because ICD-10-CM code I50.31 is classified as an MCC under the FY 2026 CMS MS-DRG system. CMS specifically identifies I50.31 as an MCC, whereas diagnoses classified only as a CC generally produce a lower severity level within DRG families that distinguish no CC/MCC, CC, and MCC cases.

Acute kidney injury, commonly represented by N17.9 when unspecified, is generally a CC rather than an MCC; CMS examples demonstrate N17.9 functioning as a CC in MS-DRG assignment. COPD with acute exacerbation and many delirium diagnoses may also affect severity assignment, but they do not exceed the MCC effect of qualifying acute heart failure in the standard hierarchy represented here.

The wording “monetary impact” must not be interpreted as permission to pursue diagnoses for financial gain. CDI professionals should query only when clinical indicators justify clarification. Reimbursement is a consequence of accurate documentation and coding, not the clinical justification for creating a diagnosis.

The actual payment impact also depends on the principal diagnosis, existing MCCs, procedures, payer methodology, and final MS-DRG.

CCDS Reference Topics: CC/MCC hierarchy; MS-DRG reimbursement; acute heart failure; compliant CDI practice.

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ICD-10-CM permits a presumed causal relationship between diabetes mellitus and certain conditions indexed under “diabetes, with,” including chronic kidney disease. Therefore, when diabetes and CKD are both documented and the provider has not specifically indicated that they are unrelated, the diabetes-with-CKD combination code is assigned together with an additional code identifying the CKD stage.

For type 2 diabetes, diabetic CKD is classified to E11.22, while an N18.- code identifies the documented CKD stage. In this scenario, stage 4 CKD would be additionally represented by the appropriate stage-specific N18 code.

A query is not routinely necessary simply to obtain wording such as “diabetic CKD” when the classification itself establishes the presumed relationship. However, clarification would be appropriate if documentation explicitly states another unrelated etiology or contains contradictory information.

This distinction is important for CDI because excessive querying can create unnecessary provider burden. CDI specialists must understand which diagnostic relationships require explicit provider linkage and which are established through ICD-10-CM conventions.

The FY 2026 Official Guidelines remain applicable to discharges through September 30, 2026.

CCDS Reference Topics: Diabetes; CKD; presumed causal relationships; combination codes; coding conventions.

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An MS-DRG relative weight represents relative expected resource consumption, not a direct severity score or mortality probability. Therefore, a relative weight of approximately 2.0 means the MS-DRG is associated with roughly twice the resource intensity of the average case represented by the standardized reference point.

CMS calculates and recalibrates MS-DRG relative weights using national hospital data as part of IPPS rate setting. The FY 2026 final-rule materials include the MS-DRG weighting factors as well as supporting cost data used in the relative-weight methodology.

Clinically complex cases often consume more resources, so relative weight may correlate with severity. However, it is not equivalent to a patient's severity-of-illness score or risk-of-mortality score. Likewise, hospitals do not simply multiply their billed charges based on the DRG weight. IPPS payment involves the standardized amount plus various adjustments, including wage index and other applicable payment factors.

For CDI, accurate documentation matters because diagnoses and procedures drive MS-DRG assignment, and the assigned MS-DRG carries its specific relative weight.

CCDS Reference Topics: IPPS; MS-DRG relative weight; resource consumption; reimbursement methodology.

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The laboratory trajectory strongly supports consideration of acute kidney injury (AKI). The creatinine increased from 0.9 to 1.5 mg/dL, an absolute increase of 0.6 mg/dL over 48 hours and approximately 1.67 times the baseline value. Combined with decreased urine output, this represents a clinically significant acute change in renal function.

The key distinction is the acute change from baseline. A single creatinine value cannot reliably establish AKI because renal function must be interpreted in context, including baseline creatinine, fluid status, urine output, medications, hemodynamics, and other contributing factors.

Chronic kidney disease requires evidence of persistent kidney abnormality over time rather than an isolated rapid deterioration. End-stage renal disease represents advanced irreversible kidney failure and is not supported by this scenario. Nephrotic syndrome is characterized by a different constellation including heavy proteinuria, hypoalbuminemia, and edema.

The CDI specialist should not independently diagnose AKI. Instead, the laboratory trend and reduced urine output create an appropriate basis for a provider query when no corresponding diagnosis has been documented.

CCDS Reference Topics: Renal pathophysiology; AKI clinical indicators; baseline comparison; diagnostic clarification.

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The attending physician is the correct answer and this scenario is adapted from an official ACDIS CCDS sample item addressing conflicting medical-record documentation.

ICD-10-CM coding depends on provider documentation, but when clinically significant documentation conflicts within the record, the discrepancy must be clarified rather than resolved independently by the coder or CDI specialist. The FY 2026 Official Guidelines specifically state that when medical-record documentation conflicts, the patient's provider should be queried for clarification.

In the inpatient environment, the attending provider is generally responsible for synthesizing the patient's diagnoses and final clinical picture. A consultant's documentation may supply essential clinical information and may support code assignment when there is no conflict, but conflicting descriptions of heart-failure type or acuity should not simply be selected based on which diagnosis produces the higher-severity code.

The query should identify the conflicting statements objectively and request clarification of the clinically appropriate diagnosis. It should not suggest which diagnosis should be selected or mention reimbursement consequences.

This concept is central to CDI because unresolved contradictions can affect MS-DRG assignment, risk adjustment, severity measurement, quality reporting, and the clinical integrity of the record.

CCDS Reference Topics: Conflicting documentation; provider clarification; heart-failure specificity; medical-record integrity.

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The clinical presentation most strongly supports clarification of hypovolemic shock, specifically hemorrhagic shock in the context of traumatic splenic bleeding. Profound hypotension at 80/60 mmHg, extreme tachycardia at 160 beats/min, substantial crystalloid resuscitation, transfusion of three units of packed red blood cells, and vasopressor support demonstrate severe circulatory compromise.

Acute blood loss anemia may also be present and should be documented when clinically supported, but it does not fully represent the patient's hemodynamic instability. Shock describes failure of effective tissue perfusion and therefore more accurately captures the immediate physiologic severity.

SIRS due to trauma is less specific than the evident volume-loss state and would not adequately describe the hemorrhagic circulatory collapse. The record already identifies splenic laceration; “ruptured spleen” should not be substituted without provider confirmation and appropriate operative/imaging evidence.

For CDI purposes, this is a classic situation in which documentation of only the anatomical injury understates the patient's physiologic acuity. A neutral query can present the documented hypotension, tachycardia, transfusion, fluids, and vasoactive treatment and request clarification of the associated condition.

CCDS Reference Topics: Shock; trauma; hemorrhage; acute blood loss; severity-of-illness documentation.

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An observed-to-expected mortality ratio is calculated by dividing observed deaths by expected deaths. Here, 125 divided by 100 equals 1.25. Therefore, observed deaths are 25% higher than the number predicted by the risk-adjustment model.

A ratio of 1.0 indicates observed mortality equals expected mortality. A value below 1.0 indicates fewer observed deaths than predicted, while a value above 1.0 indicates more observed deaths than predicted.

The CDI implication is important. Expected mortality is influenced by the patient's documented disease burden and other variables used by the applicable risk-adjustment methodology. If clinically significant conditions are underdocumented, the coded record may fail to represent the patient's actual severity, potentially reducing calculated expected mortality.

However, CDI should never seek diagnoses solely to improve a mortality ratio. Each diagnosis must be clinically supported and accurately documented. A high ratio can reflect multiple factors—including clinical outcomes, case mix, documentation, coding, data quality, or model characteristics—and should trigger multidisciplinary analysis rather than automatic querying.

ACDIS includes mortality and severity/risk adjustment within CCDS competency expectations.

CCDS Reference Topics: O/E mortality; risk adjustment; severity documentation; quality outcomes.

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ICD-10-CM presumes a causal relationship between hypertension and chronic kidney disease when both are documented, unless the provider specifically states that the conditions are unrelated. Therefore, the working coding logic should recognize hypertensive CKD and additionally identify the patient's CKD stage.

The FY 2026 Official Guidelines direct assignment of a code from category I12, Hypertensive chronic kidney disease, when hypertension and a condition classified to N18.- are both present. An additional N18.- code is required to identify the CKD stage. In this case, the documented stage is 3b.

A provider query solely to establish the hypertension-CKD relationship is unnecessary because ICD-10-CM itself supplies the presumed relationship. However, a query could become necessary if the physician explicitly states or strongly suggests that the CKD is unrelated to hypertension or if conflicting documentation exists.

The CDI specialist must distinguish coding conventions that automatically establish certain relationships from situations in which provider linkage is mandatory. This prevents unnecessary queries and supports accurate working-DRG assignment.

CCDS Reference Topics: Hypertensive CKD; presumed causal relationships; CKD staging; coding conventions; working MS-DRG.

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The fracture occurred after inpatient admission as the result of a hospital fall, placing it within CMS's Hospital-Acquired Condition category for Falls and Trauma when the applicable fracture code is included in the HAC code list. CMS's FY 2026 MS-DRG Definitions Manual continues to identify qualifying fracture codes within HAC 05.

The fracture must still be coded; therefore, option D is incorrect. Because it clearly developed after admission, it would not appropriately receive POA indicator “U,” which indicates insufficient documentation to determine whether the condition was present on admission.

For qualifying HAC diagnoses that are not POA, CMS payment logic prevents the hospital from receiving the higher MS-DRG payment that would otherwise result solely from the condition's CC/MCC status. Thus, option B expresses the intended payment effect.

This distinction is central to CDI practice: a hospital-acquired diagnosis does not disappear from the record or coding. It remains reportable for clinical and quality purposes, but certain qualifying HACs are treated differently in MS-DRG payment calculations.

CCDS Reference Topics: HACs; POA indicators; Falls and Trauma; MS-DRG payment adjustment.

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CMS's Hospital-Acquired Condition payment provisions include DVT and pulmonary embolism following certain orthopedic procedures, including qualifying hip and knee replacement cases. Consequently, accurate POA determination is important when a DVT occurs during the hospitalization.

If a qualifying HAC diagnosis was not present on admission, CMS's MS-DRG payment methodology may prevent the condition from generating the higher payment that its CC/MCC status would otherwise produce, subject to applicable grouper rules.

The diagnosis is still coded. Hospital-acquired status does not mean the condition disappears from the medical record or claim. The purpose of HAC payment logic is to modify payment treatment for defined conditions rather than suppress their reporting.

Nor does a single qualifying HAC necessarily eliminate the entire hospital payment. It affects how the MS-DRG is calculated in accordance with CMS rules.

CDI specialists should also distinguish the HAC/POA payment provision from the separate HAC Reduction Program. CMS explicitly identifies HACRP as a separate quality-payment program.

CCDS Reference Topics: DVT; orthopedic procedures; POA; HAC payment adjustment; MS-DRG.

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Severe intellectual disability is recognized ICD-10-CM terminology and maps to F72, Severe intellectual disabilities. The other phrases are not equivalent standardized ICD-10-CM diagnostic terminology.

This distinction is highly relevant to CDI. Terms used conversationally in the clinical record do not necessarily provide sufficient specificity or map cleanly to reportable ICD-10-CM diagnoses. When a patient's cognitive or developmental condition affects treatment, monitoring, self-management, nursing requirements, or the complexity of care, the CDI specialist should seek clinically appropriate provider documentation using recognized diagnostic terminology.

For FY 2026 MS-DRG logic, CMS identifies F72 as a CC, meaning it can qualify as a complication/comorbidity when it meets secondary-diagnosis reporting requirements. That does not mean the CDI specialist should query merely for reimbursement impact. The query must be clinically justified by the record and should allow the provider to determine the correct diagnosis.

“Severe mental challenge,” “acute mental incapacity,” and “acute intellectual disability” do not represent the same codable disease classification.

CCDS Reference Topics: Medical terminology; mental/behavioral and neurodevelopmental disorders; CC recognition; clinically supported query opportunities.

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The high-risk practice is destroying unanswered queries. Query retention should be governed by an established organizational policy and should not depend on whether the provider answers the query. Selectively destroying unanswered queries can create significant compliance, audit, and record-integrity concerns because it removes evidence of the documentation-clarification process.

ACDIS/AHIMA guidance has consistently required organizations to establish query-retention policies. Queries may be retained as part of the permanent health record or maintained as a retrievable business record according to organizational policy and legal requirements. The current 2026 ACDIS/AHIMA query practice guidance supersedes all previous editions, reinforcing the importance of a standardized, defensible query process.

Keeping queries in the health record is not inherently problematic when policy defines them as part of that record. Likewise, a new diagnosis may be included in a multiple-choice query when it is supported by patient-specific clinical indicators and the choices remain nonleading. A yes/no query can also be compliant in defined circumstances, such as clarification of a diagnosis or relationship already documented.

Selective destruction is therefore the clear compliance risk.

CCDS Reference Topics: Query retention; compliance; organizational query policy; audit integrity.

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When a patient is admitted with a localized infection and sepsis develops after admission, the localized infection is generally sequenced as the principal diagnosis, followed by the appropriate sepsis code.

The FY 2026 ICD-10-CM Official Guidelines explicitly distinguish this circumstance from cases in which both the localized infection and sepsis are present on admission. When sepsis develops only after admission, the localized infection responsible for the original hospitalization remains principal.

Therefore, pneumonia is sequenced first in this scenario.

If the patient subsequently develops acute organ dysfunction related to sepsis and the provider documents severe sepsis, additional severe-sepsis and organ-dysfunction codes are assigned as appropriate. The severe-sepsis code cannot itself serve as principal diagnosis.

This question demonstrates why CDI specialists must clarify timing. Simply seeing both “pneumonia” and “sepsis” in a discharge summary is insufficient to determine correct sequencing when the onset relationship is unclear.

The POA status of sepsis also becomes relevant because documentation indicates that it developed after inpatient admission.

CCDS Reference Topics: Sepsis; pneumonia; sequencing; timing; POA; principal diagnosis.

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Megestrol acetate is the correct choice. This item is adapted from an official ACDIS CCDS sample question in the Candidate Handbook, where Megace—megestrol acetate—is identified as the appropriate appetite-stimulating medication.

Megestrol acetate is a synthetic progestational agent with recognized appetite-stimulating effects. Current U.S. prescribing information specifically identifies megestrol acetate oral suspension for anorexia, cachexia, or significant unexplained weight loss in patients with AIDS. Its use illustrates why CDI specialists need functional knowledge of pharmacology: medication profiles can provide clinically relevant clues to diagnoses under evaluation, although a medication alone never establishes a reportable diagnosis.

Memantine is primarily used in Alzheimer's disease and is not an appetite stimulant. Levothyroxine replaces thyroid hormone in hypothyroidism. Sibutramine was historically used for weight reduction rather than cachexia and is therefore directionally opposite to the desired effect.

In CDI review, identification of megestrol may prompt assessment of the record for malnutrition, cachexia, malignancy-related weight loss, HIV-associated wasting, or another underlying cause, but the provider must document the diagnosis.

CCDS Reference Topics: Pharmacology; cachexia; nutrition disorders; clinical indicators.

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The significant hemoglobin decline, documented surgical blood loss, and transfusion requirement create a strong clinical basis to clarify whether the patient has acute blood loss anemia or another form of postoperative anemia.

However, neither the hemoglobin value nor transfusion independently establishes the diagnosis. The provider must determine the clinical significance and etiology. A postoperative hemoglobin decline can reflect actual hemorrhage, hemodilution, preexisting anemia, expected procedural blood loss, or multiple factors.

A compliant query could present baseline and postoperative hemoglobin levels, estimated blood loss, transfusion, hemodynamic findings, and relevant treatment, then ask the provider to characterize the anemia.

The CDI specialist should also distinguish anemia from a postprocedural complication. Even if acute blood loss anemia is documented, that does not automatically mean a surgical complication occurred. Complication status may require separate provider clarification depending on the record.

Hemolytic anemia has a different pathophysiology involving red-cell destruction, while chronic iron deficiency cannot be inferred from the acute postoperative course.

CCDS Reference Topics: Acute blood loss anemia; postoperative documentation; transfusion; clinical indicators; complications of care.

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