M60.821
BillableOther myositis, right upper arm
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M60.821 an HCC code?
No. M60.821 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
M60.821 is the ICD-10-CM diagnosis code for other myositis, right upper arm. Inflammation of muscle tissue in the right upper arm. M60.821 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering disorders of muscles (m60-m63).
M60.821 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.
Confirm laterality is documented as right; if bilateral, code both M60.821 and M60.822.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M60.821 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.