ICD-10 Code M05.831 – Other rheumatoid arthritis with rheumatoid factor of right wrist (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.831 – Other rheumatoid arthritis with rheumatoid factor of right wrist
What it is
This code identifies rheumatoid arthritis affecting the right wrist, with rheumatoid factor documented, but not classified elsewhere. Use it when the diagnosis is specific to the right wrist and the record supports rheumatoid factor positivity.
Clinical signs
Typical findings include inflammatory joint pain, swelling, stiffness, and reduced wrist motion. Clinical features vary; refer to documentation for the exact joint involvement and whether rheumatoid factor is noted.
When to use this code
Use this code when the provider documents rheumatoid arthritis with rheumatoid factor in the right wrist and does not assign a more specific rheumatoid arthritis subtype. It is appropriate when the right wrist is the only documented site or the primary coded site. Check documentation if laterality or serology is unclear.
Do not use for
Do not use it for rheumatoid arthritis without rheumatoid factor, or when the affected joint is not the right wrist. If the chart only says “arthritis” or the site is unspecified, check documentation.
Coding tip
Confirm both the rheumatoid factor association and the right-sided wrist location before assigning M05.831.