Authentic ACDIS Certification Exam CCDS-O Questions Answers

Under the Medicare Outpatient Prospective Payment System (OPPS), hospital outpatient services are paid based on Ambulatory Payment Classifications (APCs). APCs are the mechanism that groups clinically similar services and procedures—typically identified through CPT/HCPCS reporting—into payment categories with established relative resource costs. CPT codes identify what service was performed, but CPT itself is not the OPPS payment grouping methodology; OPPS takes the coded line items and maps many of them into APC groupings (with packaging rules, status indicators, and modifier impacts) to determine the payment rate. DRGs are used for inpatient prospective payment and do not apply to OPPS outpatient claims in the same way. The Physician Fee Schedule applies to professional services (physician/clinician billing) rather than the hospital facility component paid under OPPS. From an outpatient CDI lens, accurate, specific documentation supports correct CPT/HCPCS selection, modifier use, units, and medical necessity linkages—ensuring services map to the correct APC and are not inappropriately bundled, denied, or downcoded during review. This protects payment accuracy and compliance by aligning the clinical story with the reported outpatient services.

This query is non-compliant because it isleading: it asks the provider to “confirm a diagnosis of hemiplegia,” presenting only one targeted outcome rather than requesting clarification in a neutral, clinically appropriate way. ACDIS-aligned outpatient query practice requires queries to be compliant, non-leading, and supported by clinical indicators, typically offering multiple reasonable options (or an open-ended format) and allowing the provider to document the most accurate clinical impression. In this scenario, “history of CVA,” “left-sided weakness,” and “physical therapy ordered” could reflect several possibilities—such as hemiparesis, residual weakness, post-stroke deficits, deconditioning, or other neurologic impairment—so the query should ask the provider to clarify thenature and diagnosisof the deficit (and laterality), not to confirm a single diagnosis. Option A is incorrect because coding cannot assume hemiplegia without provider documentation. Option C is not the best feedback because indicators can justify clarification. Option D is unnecessary; MRI results are not required for a compliant outpatient query.

In HCC risk adjustment, chronic kidney disease (CKD) is captured by stage-based HCCs that are hierarchical—only the highest supported CKD stage in the hierarchy is counted for RAF when multiple stages (or a range) are referenced. The documentation includes “CKD – stage 3–4,” which indicates the patient’s baseline CKD severity falls somewhere between stage 3 and stage 4. When selecting from the provided table, stage 4 maps to HCC 327 and is higher than stage 3 categories (HCC 328 for stage 3B and HCC 329 for stage 3 except 3B). AKI due to ATN describes an acute process and does not replace the need to capture baseline CKD stage when it is clinically relevant and documented. Outpatient CDI best practice would be to query the provider to specify the exact CKD stage (since “3–4” is imprecise), but when forced to choose from the hierarchy shown, the correct HCC assignment based on the highest stated stage in the documented range is HCC 327 (CKD stage 4).