AAPC CIC Course Notes

Master the inpatient rules before chasing individual codes. Principal diagnosis is the condition established after study to be chiefly responsible for occasioning the admission. Additional diagnoses are reported when they meet UHDDS criteria such as clinical evaluation, treatment, diagnostic procedures, extended length of stay, or increased nursing care/monitoring. POA is a separate timing indicator, not a test of whether a diagnosis is reportable. At discharge, qualifying uncertain diagnoses in an inpatient setting are coded as if established; conditions explicitly ruled out are not.

• Expanding POA as anything other than Present on Admission.

• Read the final diagnostic statement before deciding what is confirmed, uncertain, or ruled out.

PCS is definition-driven. In Medical and Surgical, the seven characters are Section, Body System, Root Operation, Body Part, Approach, Device, and Qualifier. Build only valid combinations from a single PCS table row and support every character with documentation. Root operation is based on the objective actually performed, not the procedure name. Approach describes how the site is reached, device reflects qualifying material that remains after the procedure, and multiple-procedure rules determine when separate codes are required.

• Using procedure names instead of PCS definitions to choose the root operation.

• For every PCS question say out loud: objective, body part, approach, device, qualifier.

Code first, group second. Medicare IPPS classifies a completed, supported inpatient record through the current MS-DRG Grouper. The Grouper uses the principal diagnosis, procedures, age/sex/discharge status and valid CC/MCC information plus exclusions and other logic. Coders do not choose a DRG because it pays more. Observation remains outpatient unless the patient is formally admitted; the two-midnight benchmark concerns the physician's documented expectation and medical necessity, not whether an overnight stay automatically becomes inpatient.

• Choosing codes or sequencing based on which DRG pays more.

• When the stem mentions CC/MCC, ask first whether the diagnosis is supported and reportable.

CIC questions often separate code assignment from clinical validation and financial pressure. Code from supported documentation and official guidelines, query when documentation is conflicting, incomplete, ambiguous, or clinically inconsistent, and never query merely to create a higher-paying diagnosis. Certain code elements may be taken from appropriate non-provider documentation when ICD-10-CM expressly permits it. Audit findings should be validated, corrected when appropriate, followed by root-cause remediation and follow-up.

• Treating a query as a tool to maximize reimbursement.

• If documentation is conflicting, think 'clarify' rather than 'guess.'

This domain is practical, not encyclopedic. Know enough anatomy, terminology, and pharmacology to understand what the record says before applying ICD-10-CM/PCS. Focus on organ location/function, common procedure terms, word-part decoding, and recognizable inpatient medication classes.

• Guessing from a familiar word instead of parsing the term.

• Break unfamiliar terms into word parts.

Integrated cases test whether you can combine the rules instead of applying them in isolation. Start with the final record, establish principal diagnosis under UHDDS, identify reportable secondary diagnoses and POA status, abstract reportable procedures, construct valid PCS codes, determine sequencing, then run the complete supported case through the current Grouper. Never let reimbursement change what the documentation supports.

• Starting with the DRG instead of the record.

• Use a fixed sequence: final documentation -> PD -> secondary diagnoses -> POA -> procedures -> PCS -> sequencing -> Grouper.