M23.031
BillableCystic meniscus, other medial meniscus, right knee
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M23.031 an HCC code?
No. M23.031 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
M23.031 is the ICD-10-CM diagnosis code for cystic meniscus, other medial meniscus, right knee. A fluid-filled cyst in another part of the inner cartilage (meniscus) of the right knee, not in the front or back sections. M23.031 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).
M23.031 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 when the cyst location is in the medial meniscus but not specifically anterior or posterior horn.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M23.031 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code when the cyst location is in the medial meniscus but not specifically anterior or posterior horn
- •Document the exact anatomical location in the medical record for clarity