M22.91
BillableUnspecified disorder of patella, right knee
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M22.91 an HCC code?
No. M22.91 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
M22.91 is the ICD-10-CM diagnosis code for unspecified disorder of patella, right knee. A right kneecap problem that cannot be more specifically identified or classified. M22.91 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).
M22.91 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 non-specific code; review the medical record to determine if a more specific diagnosis code applies.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M22.91 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a non-specific code; review the medical record to determine if a more specific diagnosis code applies
- •Query the provider if the specific nature of the patellar disorder is not documented