The HCC medical abbreviation stands for both Hierarchical Condition Categories and Hepatocellular Carcinoma in healthcare. HCC codes help in risk adjustment and RAF scoring for Medicare Advantage, while in oncology, HCC refers to primary liver cancer, often linked to hepatitis or liver disease. Accurate ICD-10 coding like C22.0 and thorough EHR documentation are crucial for reimbursement, care planning, and audit readiness. Understanding both uses ensures better clinical, coding, and billing outcomes across healthcare.