ICD-10 Code M05.84 – Other rheumatoid arthritis with rheumatoid factor of hand (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.84 – Other rheumatoid arthritis with rheumatoid factor of hand
What it is
This code identifies rheumatoid arthritis affecting the hand in a patient with a positive rheumatoid factor, when the record does not specify a more exact hand site. It reflects an autoimmune inflammatory arthritis, not a traumatic or degenerative hand condition.
Clinical signs
Typical findings include persistent hand joint pain, swelling, stiffness, and reduced range of motion. Clinical features vary; refer to documentation for the specific joints involved and confirmation of rheumatoid factor positivity.
When to use this code
Use M05.84 when the provider documents rheumatoid arthritis with rheumatoid factor involving the hand, but does not name a more specific hand joint or digit. It may apply when the note states “other rheumatoid arthritis” of the hand with seropositivity. Check documentation if laterality or a more precise site is recorded.
Do not use for
Do not use this code for rheumatoid arthritis without rheumatoid factor, or for hand pain and swelling without a documented rheumatoid arthritis diagnosis. Do not use it when a more specific M05 hand code is documented.
Coding tip
Match the hand site and rheumatoid factor status exactly to the provider’s wording before assigning M05.84.