M23.351
BillableOther meniscus derangements, posterior horn of lateral meniscus, right knee
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M23.351 an HCC code?
No. M23.351 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
M23.351 is the ICD-10-CM diagnosis code for other meniscus derangements, posterior horn of lateral meniscus, right knee. Damage or displacement of the back portion of the outer cartilage (lateral meniscus) in the right knee. M23.351 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).
M23.351 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.
The posterior horn is the back part of the lateral meniscus; distinguish from anterior horn (M23.341).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M23.351 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •The posterior horn is the back part of the lateral meniscus; distinguish from anterior horn (M23.341)
- •Ensure documentation clearly indicates posterior horn location