ICD-10 Code M05.85 – Other rheumatoid arthritis with rheumatoid factor of hip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.85 – Other rheumatoid arthritis with rheumatoid factor of hip
What it is
This code identifies rheumatoid arthritis affecting the hip when rheumatoid factor is present, but the specific subtype is not otherwise classified. Use it for documented inflammatory arthritis of the hip linked to seropositive rheumatoid disease.
Clinical signs
Typical findings include chronic hip pain, stiffness, reduced range of motion, and inflammatory joint symptoms consistent with rheumatoid arthritis. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents rheumatoid arthritis with rheumatoid factor involving the hip and does not specify a more exact rheumatoid arthritis subtype. It is appropriate when the hip is the affected joint and seropositive disease is clearly stated. Check documentation if laterality or a more specific diagnosis is recorded.
Do not use for
Do not use it for rheumatoid arthritis without rheumatoid factor, or when the hip pain is due to osteoarthritis, trauma, or another non-rheumatoid cause. Check documentation if the diagnosis is uncertain.
Coding tip
Assign the most specific rheumatoid arthritis code available, and confirm the hip involvement and rheumatoid factor status in the provider note.