M79.A29
BillableNontraumatic compartment syndrome of unspecified lower extremity
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M79.A29 an HCC code?
No. M79.A29 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
M79.A29 is the ICD-10-CM diagnosis code for nontraumatic compartment syndrome of unspecified lower extremity. A serious condition where pressure builds up in the muscles of an unspecified leg, potentially cutting off blood flow and damaging tissue, without being caused by an injury. M79.A29 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other soft tissue disorders (m70-m79).
M79.A29 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.
Specify the laterality (right vs. left) when documented; use M79.A21 for right or M79.A22 for left if available.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M79.A29 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.