ICD-10 Code M05.671 – Rheumatoid arthritis of right ankle and foot with involvement of other organs and systems (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.671 – Rheumatoid arthritis of right ankle and foot with involvement of other organs and systems
What it is
This code identifies rheumatoid arthritis affecting the right ankle and foot, with documented involvement of other organs or body systems. Use it when the record clearly links the joint disease to systemic rheumatoid involvement.
Clinical signs
Typical findings include inflammatory pain, swelling, stiffness, and reduced motion in the right ankle or foot. Clinical features vary; refer to documentation for evidence of extra-articular or systemic involvement.
When to use this code
Use this code when the provider documents rheumatoid arthritis in the right ankle and foot and specifies involvement of other organs or systems. The note should support both the joint location and the systemic manifestation. Check documentation if the record only mentions rheumatoid arthritis without site or systemic detail.
Do not use for
Do not use it for rheumatoid arthritis limited to the joint only, or when the affected side is not documented. Do not assign it if extra-articular involvement is not clearly stated.
Coding tip
Verify laterality and systemic involvement in the assessment, problem list, or rheumatology note before coding.