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CAC leverages NLP to propose codes based on clinical text, but it cannot replace the coder’s application of official guidelines, payer policies, and clinical context. Best practice is a human-in-the-loop model where coders validate suggested codes, confirm principal/primary selection, verify specificity (laterality, acuity, staging), apply sequencing rules, and reconcile documentation inconsistencies. Option A over-trusts confidence scores; NLP can misinterpret negations, history vs. current, or rule-out statements. Option C risks inappropriate code acceptance without due diligence or query escalation for ambiguous documentation; coding must be based on provider documentation, not CAC output alone. Option D would prevent correction of misassigned codes, undermining accuracy and compliance. Effective CAC governance includes quality audits, feedback loops to improve NLP models, coder training, and monitoring KPIs (DNFB days, accuracy rates, denial trends). Integration with encoders and edit systems (NCCI, MUE, LCD/NCD) should complement, not replace, expert review.

Systemic Inflammatory Response Syndrome (SIRS) due to infection typically indicates sepsis when clinically validated. However, since provider did not document “sepsis,” the coder cannot assign it directly. The correct action is to code pneumonia and query for clarification. If confirmed, assign A41.x (sepsis) plus pneumonia code. Querying avoids compliance issues and ensures clinical accuracy.

Assign K57.32 (Diverticulitis of large intestine with perforation and abscess without bleeding). The sigmoid colon is part of the large intestine. Code choice reflects both diverticulitis and the abscess complication. Correct coding captures severity and aligns with ICD-10-CM guidelines.

Coders cannot assign malignancy based only on pathology. Provider must confirm diagnosis. Query is needed to determine whether excised “uterine mass” is malignant. Coding malignancy without documentation risks compliance violations. Correct practice: query and, if confirmed, assign C54.x malignant neoplasm of uterus.

In inpatient coding, uncertain diagnoses documented as “probable,” “likely,” “suspected,” or “possible” are coded as if established. Therefore, pneumonia should be coded. Outpatient rules differ—uncertain conditions are not coded. Coders must distinguish settings carefully. Option B/C would underreport severity. No query is required since provider clearly documented “probable pneumonia” at discharge.