ICD-10 Code M05.761 – Rheumatoid arthritis with rheumatoid factor of right knee without organ or systems involvement (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.761 – Rheumatoid arthritis with rheumatoid factor of right knee without organ or systems involvement
What it is
This code identifies rheumatoid arthritis with rheumatoid factor affecting the right knee, without documented organ or system involvement. Use it when the diagnosis is limited to that joint and the record supports rheumatoid factor positivity.
Clinical signs
Common findings include chronic inflammatory joint pain, swelling, stiffness, and reduced range of motion in the right knee. Clinical features vary; refer to documentation for evidence of rheumatoid factor and joint-specific involvement.
When to use this code
Use this code when the provider documents rheumatoid arthritis with rheumatoid factor in the right knee and does not describe extra-articular disease. It fits outpatient, inpatient, or problem-list documentation when the knee is the only specified joint. If the record mentions organ or system involvement, choose a more specific code.
Do not use for
Do not use it for rheumatoid arthritis without rheumatoid factor, unspecified knee involvement, or disease affecting multiple joints without right-knee specificity. Check documentation if organ or system involvement is present.
Coding tip
Verify both the rheumatoid factor status and the right-knee site before assigning M05.761.