M65.311
BillableTrigger thumb, right thumb
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M65.311 an HCC code?
No. M65.311 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
M65.311 is the ICD-10-CM diagnosis code for trigger thumb, right thumb. A condition where the right thumb gets stuck or locks in a bent position due to inflammation of the tendon sheath, causing a snapping or clicking sensation when straightening it. M65.311 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering disorders of synovium and tendon (m65-m67).
M65.311 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Verify laterality is documented as right thumb in the medical record before assigning this code.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M65.311 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.