ICD-10 Code M05.472 – Rheumatoid myopathy with rheumatoid arthritis of left ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.472 – Rheumatoid myopathy with rheumatoid arthritis of left ankle and foot
What it is
This code identifies rheumatoid arthritis affecting the left ankle and foot, with associated rheumatoid myopathy. Use it when documentation shows both the joint disease and muscle involvement in that location.
Clinical signs
Typical findings include inflammatory joint pain, swelling, stiffness, and reduced motion in the left ankle or foot. Rheumatoid myopathy may be documented as muscle weakness or muscle involvement related to rheumatoid disease; clinical features vary, refer to documentation.
When to use this code
Use this code when the provider specifically documents rheumatoid arthritis with rheumatoid myopathy in the left ankle and foot. It is appropriate when the record clearly links the muscle involvement to the rheumatoid condition and identifies the left-sided location.
If the note only says rheumatoid arthritis without myopathy, or myopathy without a rheumatoid link, check documentation before coding. Make sure the laterality and joint site are both supported in the record.
Do not use for
Do not use this code for rheumatoid arthritis in another joint, unspecified laterality, or muscle weakness not documented as rheumatoid myopathy. Check documentation if the site or relationship is unclear.
Coding tip
Confirm both elements: rheumatoid myopathy and rheumatoid arthritis of the left ankle and foot.