CCDS ACDIS Certified Clinical Documentation Specialist Free Practice Exam Questions (2026 Updated)

The most meaningful indicator is an increased volume of appropriately supported cases grouping to respiratory infection DRGs. The stated purpose of the pilot is not merely to obtain more physician responses; it is specifically to improve documentation of the type or etiology of pneumonia.

When providers document clinically supported pneumonia specificity—for example, an identified bacterial etiology or another qualifying respiratory infection—the coded case may move from a less specific/simple pneumonia grouping into a respiratory infections and inflammations DRG family, depending on the final diagnoses and grouper logic. A trend toward the expected DRG distribution can therefore demonstrate that the form is accomplishing its documentation objective.

Provider response and agreement rates are valuable CDI process metrics, but neither proves that useful specificity was obtained. A physician could respond to every query without adding meaningful diagnostic detail. Likewise, an increase in simple pneumonia DRGs would suggest that the intended specificity is not being captured effectively.

A robust CDI analysis should also verify that any DRG shift reflects clinically valid documentation rather than query pressure or reimbursement-oriented behavior.

CCDS Reference Topics: CDI metrics; query effectiveness; pneumonia specificity; MS-DRG trend analysis.

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This scenario requires a clinical validation query. The diagnosis of respiratory failure is documented, but the remainder of the record lacks clinical evidence supporting it. CDI should not automatically accept the diagnosis solely because it appears in a progress note, nor should the specialist unilaterally remove or invalidate the provider's diagnosis.

The appropriate process is to present relevant patient-specific clinical information objectively and ask the responsible provider to clarify whether respiratory failure remains clinically appropriate. A compliant validation query should permit the provider to confirm the diagnosis, document another condition, indicate that it was ruled out, or provide another clinically appropriate response.

Looking only for CPAP documentation is inadequate because CPAP can be used for multiple conditions and its presence or absence does not independently determine whether respiratory failure exists. Similarly, simply refusing to code the diagnosis without seeking clarification bypasses the provider's clinical judgment and the organization's validation process.

The 2026 ACDIS/AHIMA query guidance is now the current foundational standard and supersedes earlier versions of the practice brief.

CCDS Reference Topics: Clinical validation; compliant querying; unsupported diagnoses; documentation integrity.

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The findings strongly support a clarification opportunity for acute hypercapnic respiratory failure. The patient has a substantial acute rise in PaCO₂ above the documented baseline, respiratory acidemia with a pH of 7.27, hypoxemia, altered mental status, respiratory distress, and escalation to noninvasive ventilatory support.

In chronic CO₂ retention, renal compensation commonly increases serum bicarbonate and may allow a relatively preserved pH. A pronounced fall in pH in conjunction with a significant increase in PaCO₂ suggests an acute ventilatory deterioration. The need for BiPAP provides additional evidence of clinically significant respiratory compromise.

Option C is incorrect because the acidemia is driven primarily by elevated carbon dioxide, indicating respiratory rather than metabolic acidosis. Option A fails to capture the apparent acute deterioration from the patient's baseline. Option D is inconsistent with the physiologic abnormalities and treatment intensity.

The CDI specialist must still obtain provider documentation rather than independently diagnose respiratory failure. The CCDS examination specifically includes acute/chronic respiratory failure, COPD, ventilation support, and diagnostic-test interpretation among expected clinical competencies.

CCDS Reference Topics: Acute respiratory failure; hypercapnia; ABG interpretation; COPD; noninvasive ventilation.

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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 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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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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Case mix index is calculated by dividing the sum of MS-DRG relative weights by the number of inpatient discharges:

2,640 ÷ 1,600 = 1.65

Therefore, the CMI is 1.65.

CMI represents the average relative resource intensity of the hospital's inpatient cases. It is affected by the types of patients treated, surgical versus medical mix, tertiary services, transplant or trauma volume, documentation specificity, coding accuracy, and annual changes to MS-DRG relative weights and grouper logic.

CMS publishes hospital case-mix information and FY 2026 relative weighting factors through the IPPS Final Rule supporting data. Table 5 contains MS-DRGs and relative weighting factors, while Table 2 contains hospital-specific case-mix information.

A decline in CMI should not automatically be interpreted as a CDI failure. A shift toward lower-complexity cases or changes in service lines can legitimately reduce CMI even with excellent documentation.

CDI managers should therefore trend CMI alongside diagnosis capture, surgical volume, service lines, payer population, coding reconciliation, and quality indicators.

CCDS Reference Topics: Case mix index; MS-DRG relative weight; CDI analytics; hospital performance.

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The provider query response rate is calculated by dividing answered queries by total queries issued:

720 ÷ 800 × 100 = 90%.

Therefore, the correct answer is 90%.

The 540 responses agreeing with the clarification are relevant to a different measure: provider agreement rate. If agreement were calculated against answered queries, it would be 540 ÷ 720 = 75%.

These metrics should not be confused. Response rate measures whether providers participate in the clarification process, whereas agreement rate measures the proportion of responses that substantively agree with the diagnosis or clarification being evaluated.

A lower agreement rate is not necessarily evidence of poor CDI performance. Providers should remain free to disagree, document another supported diagnosis, rule out a condition, or indicate that the issue cannot be determined.

A CDI manager should trend response rate, agreement rate, response time, unanswered-query aging, retrospective-query percentage, and query type together rather than judging program success from a single number.

The 2026 ACDIS/AHIMA guidance reinforces provider independence as a fundamental aspect of a compliant query process.

CCDS Reference Topics: Query response rate; agreement rate; CDI metrics; provider engagement; program analysis.

A condition documented in the medical record does not automatically qualify as a reportable secondary diagnosis. For inpatient coding, additional diagnoses generally must be clinically significant during the current hospitalization. Qualifying significance includes clinical evaluation, therapeutic treatment, diagnostic procedures, an extended length of stay, or increased nursing care and/or monitoring.

Here, GERD is merely part of the patient's historical medical background and does not affect current management. Therefore, it generally should not be reported as an additional diagnosis solely because it appears in the past medical history.

Whether a diagnosis is classified as a CC or MCC is a separate issue. A condition must first satisfy applicable reporting requirements before its MS-DRG severity classification matters. CDI specialists should never encourage coding of clinically irrelevant historical conditions merely because they could affect reimbursement.

This principle protects the clinical integrity of coded data and prevents inappropriate inflation of disease burden. CDI review should focus on conditions that meaningfully describe the patient's current hospitalization, treatment requirements, clinical risk, and resource consumption.

CCDS Reference Topics: Reporting additional diagnoses; secondary-diagnosis criteria; medical-record review; resource utilization; coding compliance.

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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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This is an appropriate clinical validation query because the provider has documented a diagnosis while the available clinical information appears inconsistent with that diagnosis.

The CDI specialist should not automatically accept every documented diagnosis when substantial contradictory clinical evidence exists. Conversely, CDI cannot independently delete the physician's diagnosis or replace the physician's clinical judgment.

The query should objectively identify the documented severe malnutrition and relevant contradictory findings—for example, stable weight, adequate nutritional intake, and absence of documented muscle or fat loss—and ask the provider to clarify whether severe malnutrition remains clinically appropriate, whether another nutritional condition better describes the patient, whether the diagnosis has been ruled out, or whether additional clinical reasoning supports it.

The query must remain neutral and should not mention the MCC status or potential reimbursement effect of severe malnutrition.

The August 2026 ACDIS/AHIMA compliant-query guidance supersedes previous editions and is the current foundational standard for compliant documentation clarification.

CCDS Reference Topics: Clinical validation; malnutrition; conflicting clinical indicators; compliant queries; documentation integrity.

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This is a classic clinical validation query scenario. A diagnosis has been documented, but the available clinical evidence appears inconsistent with or insufficient to support that diagnosis.

The CDI specialist should not independently delete acute respiratory failure, substitute another diagnosis, or direct coding personnel to disregard provider documentation without an appropriate clarification process. Instead, the query should objectively present the relevant clinical findings—normal respiratory effort, room-air oxygenation, absence of escalating oxygen requirements, and absence of ventilatory support—and ask the provider to clarify the diagnosis.

The provider may confirm respiratory failure and document additional clinical reasoning, revise the diagnosis, identify another condition, or state that the diagnosis was ruled out. The CDI specialist's responsibility is to support record integrity, not to replace provider clinical judgment.

The official CCDS content outline specifically requires candidates to understand mechanisms for addressing diagnoses lacking clinical support and to distinguish compliant from noncompliant queries. The current 2026 ACDIS/AHIMA guidance is the foundational query-practice standard.

CCDS Reference Topics: Clinical validation; respiratory failure; unsupported diagnoses; compliant query practice; documentation integrity.

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For POA reporting, “present on admission” refers to a condition present at the time the order for inpatient admission occurs. Conditions that develop during an outpatient encounter—including emergency-department, observation, or outpatient surgery care—before the inpatient admission order are generally considered POA when they are present at that inpatient admission point.

Therefore, the NSTEMI in this scenario is considered present on admission even though it developed after the patient physically arrived at the hospital.

This distinction is essential because hospital arrival and inpatient admission are not synonymous for POA purposes. A patient may spend hours in the ED or observation status before an inpatient order is entered.

The POA indicator applies to applicable principal and secondary diagnoses and is important to CMS's HAC payment provisions as well as quality analysis. A condition does not become hospital acquired merely because it arose somewhere on hospital premises before inpatient status began.

CDI specialists should clarify timing when the record does not establish whether a diagnosis existed before or after the inpatient admission order rather than relying solely on note timestamps or physical location.

The FY 2026 ICD-10-CM Official Guidelines contain the governing POA definitions and reporting rules.

CCDS Reference Topics: POA; emergency department; observation; timing of diagnosis; HAC payment logic.

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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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Taking more medication than prescribed constitutes poisoning under ICD-10-CM drug-event rules. The drug may have been correctly prescribed, but the patient took an incorrect amount.

For poisoning, the applicable poisoning code is generally sequenced first, followed by codes identifying manifestations such as gastrointestinal bleeding.

This differs from an adverse effect, in which a drug is correctly prescribed and properly administered but causes an undesirable reaction. In adverse-effect scenarios, the nature of the adverse effect is coded first, followed by the drug code with the appropriate adverse-effect character.

Underdosing applies when the patient takes less of a medication than prescribed, whether intentionally or unintentionally. It does not describe excessive dosing.

For CDI specialists, determining whether an event represents poisoning, adverse effect, or underdosing requires careful review of how the medication was prescribed and actually taken. Phrases such as “warfarin-related bleeding” may not always provide enough information to determine the correct classification.

A clarification query may therefore be appropriate when dose, intent, or medication-use circumstances are unclear.

CCDS Reference Topics: Poisoning; adverse effects; underdosing; medication events; sequencing.

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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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Case mix index is calculated by dividing the total MS-DRG relative weights by the number of discharges:

1,750 ÷ 1,000 = 1.75

Therefore, the hospital's CMI is 1.75.

CMI is an aggregate measure representing the average relative resource intensity of the hospital's inpatient population under the MS-DRG system. A higher CMI generally indicates that the hospital treated cases assigned to DRGs with higher average relative weights.

However, CMI should never be interpreted as a pure measure of clinical quality. It can be affected by patient population, service-line composition, surgical volume, transplant activity, documentation completeness, coding accuracy, changes in grouper methodology, and other factors.

CMS specifically publishes hospital CMI data and uses MS-DRG relative weights in the IPPS payment methodology. CMS also maintains FY 2026 case-mix and relative-weight files as part of the final-rule data package.

For CDI program analysis, unexplained CMI changes should trigger investigation rather than an automatic assumption of poor documentation. Service-line and diagnosis-level analysis usually provides a more meaningful interpretation.

CCDS Reference Topics: Case mix index; relative weights; CDI analytics; MS-DRGs; program performance.

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The key issue is whether the sepsis documented on hospital day 2 was present on admission (POA) or developed after admission. The admission already contains potentially relevant indicators—fever, pneumonia, hypotension, cultures, and IV antibiotic treatment—but a CDI specialist cannot independently determine from those indicators that sepsis was POA. Provider clarification is necessary.

This distinction directly affects principal-diagnosis sequencing. When sepsis and a localized infection such as pneumonia are both responsible for admission, the systemic infection is generally sequenced before the localized infection. Conversely, when the patient is admitted with pneumonia and sepsis develops only after admission, pneumonia is sequenced first.

The POA guidelines also emphasize that a diagnosis may not be recognized until days after admission and that delayed documentation does not automatically mean the condition was hospital-acquired. When timing is unclear, querying the provider is appropriate.

There is no evidence supporting aspiration pneumonia, so option B would introduce an unsupported concept. Options C and D prematurely determine principal diagnosis without resolving the timing of sepsis.

CCDS Reference Topics: Sepsis sequencing; POA assignment; principal diagnosis; compliant clarification of timing.

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An MCC—major complication or comorbidity—represents the highest secondary-diagnosis severity category within the standard three-tier MS-DRG hierarchy. CMS describes MCCs as diagnoses with the highest level of severity affecting hospital resource use, CCs as conditions with a moderate level, and non-CC diagnoses as the lowest severity level.

When an MS-DRG family is divided into “with MCC,” “with CC,” and “without CC/MCC,” the presence of a qualifying MCC generally moves the case into the highest severity subdivision, assuming no exclusion or other grouper rule prevents that effect.

This does not mean every MCC always increases payment. Some secondary diagnoses are excluded as MCCs or CCs in particular circumstances because of principal-diagnosis exclusions or DRG-specific logic. CMS's FY 2026 Definitions Manual specifically contains exclusion lists and severity logic for such situations.

CDI specialists should understand MCC/CC logic to interpret working DRGs, but query activity must be driven by clinical accuracy rather than the financial value of a severity level.

CCDS Reference Topics: MS-DRGs; MCC; CC; severity subdivisions; resource utilization; reimbursement compliance.

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