ICD-10 Code M05.839 – Other rheumatoid arthritis with rheumatoid factor of unspecified wrist (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.839 – Other rheumatoid arthritis with rheumatoid factor of unspecified wrist
What it is
This code identifies rheumatoid arthritis with rheumatoid factor affecting an unspecified wrist, when the condition does not fit a more specific rheumatoid arthritis category. Use it for documented RA with RF involvement of the wrist side not named.
Clinical signs
Typical findings include chronic inflammatory joint pain, swelling, stiffness, and reduced wrist motion. Clinical features vary; refer to documentation, especially when the record confirms rheumatoid factor positivity and wrist involvement.
When to use this code
Use M05.839 when the provider documents rheumatoid arthritis with rheumatoid factor and specifies the wrist, but not left or right. It also fits cases where the record uses a nonspecific wrist designation. Check documentation if the laterality is unclear or another rheumatoid arthritis subtype is stated.
Do not use for
Do not use this code for rheumatoid arthritis without rheumatoid factor, or when the wrist side is documented as left or right. If the chart describes another joint or a more specific RA code, choose that instead.
Coding tip
Verify both rheumatoid factor status and wrist laterality before assigning M05.839.