ICD-10 Code M06.061 – Rheumatoid arthritis without rheumatoid factor, right knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M06.061 – Rheumatoid arthritis without rheumatoid factor, right knee
What it is
This code identifies rheumatoid arthritis affecting the right knee when rheumatoid factor is not documented or is absent. Use it for a specific knee joint diagnosis, not for generalized rheumatoid arthritis.
Clinical signs
Typical findings include joint pain, swelling, stiffness, and reduced range of motion in the right knee. Clinical features vary; refer to documentation for confirmation of rheumatoid arthritis and laterality.
When to use this code
Use this code when the provider documents rheumatoid arthritis without rheumatoid factor and specifies the right knee. It is appropriate for encounters focused on that joint involvement, including evaluation, monitoring, or follow-up. Check documentation if the record does not clearly state seronegative disease or laterality.
Do not use for
Do not use it for rheumatoid arthritis with rheumatoid factor, unspecified knee involvement, or symptoms alone without a documented diagnosis. Check documentation if the note only says arthritis or joint pain.
Coding tip
Verify both the seronegative status and the right-knee laterality before assigning M06.061.