M22.8X9
BillableOther disorders of patella, unspecified knee
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M22.8X9 an HCC code?
No. M22.8X9 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
M22.8X9 is the ICD-10-CM diagnosis code for other disorders of patella, unspecified knee. Other miscellaneous problems affecting the kneecap in an unspecified knee that don't fit into standard categories. M22.8X9 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).
M22.8X9 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.
Avoid this code if possible by determining laterality and using M22.8X1 or M22.8X2.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M22.8X9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.