ICD-10 to HCC/RAF Pipeline: Why Same Codes Yield Different Scores

ICD-10 codes don't directly carry RAF weights; they map to HCCs via a crosswalk, then hierarchies remove less severe conditions before summing coefficients. The same code set produces different scores under CMS-HCC V24 vs V28 due to different maps and coefficients. Developers need current crosswalk, hierarchy, coefficient, and interaction tables for accurate computation.