ICD-10 Code M05.762 – Rheumatoid arthritis with rheumatoid factor of left knee without organ or systems involvement (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.762 – Rheumatoid arthritis with rheumatoid factor of left knee without organ or systems involvement
What it is
This code identifies rheumatoid arthritis with positive rheumatoid factor affecting the left knee only, without documented involvement of other organs or body systems. Use it when the record specifies the left knee as the site and does not note systemic disease.
Clinical signs
Typical findings include chronic inflammatory joint pain, swelling, stiffness, and reduced motion in the left knee. Clinical features vary; refer to documentation for evidence of rheumatoid factor positivity and absence of extra-articular involvement.
When to use this code
Use this code when the provider documents rheumatoid arthritis with rheumatoid factor in the left knee and no organ or system involvement. It also fits follow-up visits, imaging review, or specialist assessments that confirm the same diagnosis. If the record does not clearly identify the knee or systemic status, check documentation.
Do not use for
Do not use it for rheumatoid arthritis without rheumatoid factor, other joints, or generalized rheumatoid disease with organ involvement. If the left knee site or seropositive status is not documented, choose a different code or check documentation.
Coding tip
Verify both the left-sided joint location and the rheumatoid factor documentation before assigning M05.762.