ICD-10 Code M05.641 – Rheumatoid arthritis of right hand with involvement of other organs and systems (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.641 – Rheumatoid arthritis of right hand with involvement of other organs and systems
What it is
This code identifies rheumatoid arthritis affecting the right hand, with documented involvement beyond the joint itself. Use it when the record shows systemic or extra-articular disease linked to rheumatoid arthritis.
Clinical signs
Findings may include chronic inflammatory joint pain, swelling, stiffness, and reduced hand function. Clinical features vary; refer to documentation for evidence of other organ or system involvement.
When to use this code
Use M05.641 when the provider documents rheumatoid arthritis in the right hand and specifies involvement of other organs or systems. The record should support both the anatomic site and the systemic manifestation. If laterality or systemic involvement is unclear, check documentation before coding.
Do not use for
Do not use this code for rheumatoid arthritis without right-hand involvement, or when the disease is limited to the joints only. Check documentation if the note does not clearly state involvement of other organs or systems.
Coding tip
Confirm laterality and systemic involvement in the assessment or problem list before assigning M05.641.