Free medical coding reference tools
Fast, free lookups built on the licensed CMS dataset our coding engine validates against — 74,879 billable FY2027 ICD-10-CM codes, 115 CMS-HCC V28 categories, 768 MS-DRGs, and 33,627,784 CC/MCC exclusion pairs. No login, no gates.
Map any ICD-10-CM code to its CMS-HCC V28 category and RAF coefficients across all seven population segments.
Paste a problem list — V28 HCCs with hierarchy logic applied and PY2026 coefficients summed by population segment.
Base AND effective severity status. The only free checker that applies the FY2026 principal-diagnosis exclusion pairs.
FY2027 (MS-DRG v44) relative weights, GMLOS/AMLOS, and severity-split families for all 768 MS-DRGs.
Why these tools are free
Rafter builds prospective revenue-integrity software for independent practices with 1–15 clinicians. Every lookup here runs against the same CMS reference tables our production coding engine uses — kept current every October 1. If your practice bills Medicare Advantage, the same engine can read your last 30 days of charts and show what documentation gaps cost you: get a free look-back.