M61.261
BillableParalytic calcification and ossification of muscle, right lower leg
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M61.261 an HCC code?
No. M61.261 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
M61.261 is the ICD-10-CM diagnosis code for paralytic calcification and ossification of muscle, right lower leg. Abnormal bone and calcium deposits forming in the muscles of the right lower leg (between knee and ankle), typically occurring after paralysis or severe injury. M61.261 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).
M61.261 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.
Ensure documentation specifies right lower leg and not foot or ankle.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M61.261 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Ensure documentation specifies right lower leg and not foot or ankle
- •This condition is common in patients with spinal cord injuries or severe stroke