M13.121: Monoarthritis, not elsewhere classified, right elbow
M13.121 is the billable ICD-10-CM diagnosis code for Monoarthritis, not elsewhere classified, right elbow. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code M13.121?
M13.121 is the ICD-10-CM diagnosis code for Monoarthritis, not elsewhere classified, right elbow. It belongs to category M13 (Other arthritis).
Is M13.121 a billable code?
Yes. M13.121 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does M13.121 belong to?
M13.121 is part of ICD-10-CM category M13 — Other arthritis, which has 94 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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