ICD-10 Code M05.26 – Rheumatoid vasculitis with rheumatoid arthritis of knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.26 – Rheumatoid vasculitis with rheumatoid arthritis of knee
What it is
This code identifies rheumatoid arthritis of the knee complicated by rheumatoid vasculitis, an inflammatory blood vessel disorder associated with severe rheumatoid disease. Use it when documentation links the knee involvement and vasculitis together.
Clinical signs
Clinical features may include longstanding rheumatoid arthritis with evidence of vasculitis affecting skin, nerves, or other organs. Knee pain, swelling, and inflammatory joint findings may be present; clinical features vary, so refer to documentation.
When to use this code
Use this code when the provider documents rheumatoid vasculitis and specifies rheumatoid arthritis affecting the knee. It applies when the knee is the documented joint site, not when arthritis is described without vasculitis. Check documentation if the record does not clearly connect both conditions.
Do not use for
Do not use this code for rheumatoid arthritis of the knee without vasculitis, or for vasculitis unrelated to rheumatoid disease. If the joint site or causal relationship is unclear, check documentation.
Coding tip
Confirm that both rheumatoid vasculitis and knee involvement are explicitly documented before assigning M05.26.