M23.359
BillableOther meniscus derangements, posterior horn of lateral meniscus, unspecified knee
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M23.359 an HCC code?
No. M23.359 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
M23.359 is the ICD-10-CM diagnosis code for other meniscus derangements, posterior horn of lateral meniscus, unspecified knee. Damage or displacement of the back portion of the outer cartilage (lateral meniscus) when the specific knee side is not documented. M23.359 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other joint disorders (m20-m25).
M23.359 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.
This is a less specific code; query the provider or medical record for laterality information.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M23.359 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a less specific code; query the provider or medical record for laterality information
- •Use only when side cannot be determined from clinical documentation