ICD-10 Code M05.261 – Rheumatoid vasculitis with rheumatoid arthritis of right knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.261 – Rheumatoid vasculitis with rheumatoid arthritis of right knee
What it is
M05.261 identifies rheumatoid vasculitis occurring with rheumatoid arthritis in the right knee. Use it when the record shows both rheumatoid arthritis and vasculitic involvement linked to that joint.
Clinical signs
Clinical features vary; refer to documentation. Rheumatoid vasculitis may present with inflammatory joint disease plus signs of vascular involvement, and the right knee must be specifically documented as affected.
When to use this code
Use this code when the provider documents rheumatoid vasculitis in a patient who also has rheumatoid arthritis of the right knee. It is appropriate when the right knee is the specified site and the vasculitis is part of the diagnosis. Check documentation if laterality or the vasculitic component is unclear.
Do not use for
Do not use this code for rheumatoid arthritis of the knee without vasculitis, or for vasculitis not linked to rheumatoid arthritis. If the affected knee is not the right knee, choose the correct laterality code.
Coding tip
Confirm both the rheumatoid vasculitis and the right-knee laterality in the provider note before assigning M05.261.