ICD-10 Code M05.749 – Rheumatoid arthritis with rheumatoid factor of unspecified hand without organ or systems involvement (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.749 – Rheumatoid arthritis with rheumatoid factor of unspecified hand without organ or systems involvement
What it is
This code identifies rheumatoid arthritis affecting an unspecified hand, with a positive rheumatoid factor and no documented organ or system involvement. Use it when the record names the hand but does not specify right or left.
Clinical signs
Typical findings include chronic inflammatory joint pain, swelling, stiffness, and reduced hand function. Clinical features vary; refer to documentation for evidence of rheumatoid factor positivity and any mention of extra-articular disease.
When to use this code
Use this code when the provider documents rheumatoid arthritis with rheumatoid factor in the hand and does not specify laterality. It is appropriate for visits focused on hand joint involvement only, when no organ or systemic manifestations are recorded. Check documentation if the note is unclear about which hand is affected.
Do not use for
Do not use it if the record specifies right or left hand, or if rheumatoid arthritis is documented without rheumatoid factor. Also avoid it when organ or system involvement is present and separately documented.
Coding tip
Verify laterality and confirm that rheumatoid factor is documented before assigning M05.749.