M13.131
BillableMonoarthritis, not elsewhere classified, right wrist
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M13.131 an HCC code?
No. M13.131 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
M13.131 is the ICD-10-CM diagnosis code for monoarthritis, not elsewhere classified, right wrist. Inflammation of a single joint in the right wrist that doesn't fit into other specific diagnostic categories. M13.131 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering inflammatory polyarthropathies (m05-m14).
M13.131 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.
Ensure documentation specifies right wrist to avoid confusion with left wrist.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M13.131 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Ensure documentation specifies right wrist to avoid confusion with left wrist
- •Distinguish between wrist monoarthritis and carpal tunnel syndrome or other wrist conditions