M13.122
BillableMonoarthritis, not elsewhere classified, left elbow
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M13.122 an HCC code?
No. M13.122 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
M13.122 is the ICD-10-CM diagnosis code for monoarthritis, not elsewhere classified, left elbow. Inflammation of a single joint in the left elbow that doesn't fit into other specific diagnostic categories. M13.122 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).
M13.122 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.
Verify left elbow is documented to distinguish from right elbow coding.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M13.122 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify left elbow is documented to distinguish from right elbow coding
- •Review clinical notes to confirm monoarthritis diagnosis rather than polyarthritis