ICD-10 Code M05.70 – Rheumatoid arthritis with rheumatoid factor of unspecified site without organ or systems involvement (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.70 – Rheumatoid arthritis with rheumatoid factor of unspecified site without organ or systems involvement
What it is
This code identifies rheumatoid arthritis with a positive rheumatoid factor when the affected joint site is not specified and there is no documented organ or system involvement. Use it for RA cases documented without extra-articular disease.
Clinical signs
Typical findings include chronic inflammatory joint pain, stiffness, swelling, and tenderness consistent with rheumatoid arthritis. Clinical features vary; refer to documentation, especially when the record does not specify the involved site.
When to use this code
Use M05.70 when the provider documents rheumatoid arthritis with rheumatoid factor positivity but does not name a specific joint or site. Choose it when the chart also states there is no organ or system involvement. If the site or systemic manifestations are documented, code more specifically.
Do not use for
Do not use this code for rheumatoid arthritis without rheumatoid factor or for cases with documented organ or system involvement. Check documentation if the site is known, because a more specific code may apply.
Coding tip
Verify both rheumatoid factor status and the absence of extra-articular involvement before assigning M05.70.