M85.339
BillableOsteitis condensans, unspecified forearm
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M85.339 an HCC code?
No. M85.339 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
M85.339 is the ICD-10-CM diagnosis code for osteitis condensans, unspecified forearm. A condition where bone becomes abnormally dense and hardened in the forearm, typically occurring as a response to inflammation or stress on the bones. M85.339 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering disorders of bone density and structure (m80-m85).
M85.339 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.
Use this code only when the specific forearm (right or left) is not documented; if laterality is known, use M85.331 or M85.332 instead.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M85.339 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.