Rheumatoid vasculitis with rheumatoid arthritis of left knee

This code signifies a systemic inflammatory condition characterized by vasculitis occurring in a patient with rheumatoid arthritis, specifically affecting the left knee joint. It indicates the presence of blood vessel inflammation secondary to rheumatoid disease, with manifestations localized to the left knee.

Apply this code when documentation clearly states rheumatoid vasculitis in a patient diagnosed with rheumatoid arthritis, with specific involvement of the left knee. Supporting documentation should include physician notes detailing the diagnosis of rheumatoid arthritis, evidence of vasculitis, and explicit mention of left knee involvement.

• Ensure documentation specifies "rheumatoid vasculitis" and not just general vasculitis or rheumatoid arthritis with knee involvement.
• Verify laterality; this code is specific to the left knee. If the right knee or bilateral knees are affected, a different code is required.
• Do not use this code for rheumatoid arthritis without documented vasculitis, even if severe.