ICD-10 Code M05.432 – Rheumatoid myopathy with rheumatoid arthritis of left wrist (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.432 – Rheumatoid myopathy with rheumatoid arthritis of left wrist
What it is
This code identifies rheumatoid arthritis affecting the left wrist with associated rheumatoid myopathy. It means the joint disease is documented along with muscle involvement linked to rheumatoid disease.
Clinical signs
Typical findings include inflammatory wrist pain, swelling, stiffness, and reduced motion, plus muscle weakness or wasting related to rheumatoid disease. Clinical features vary; refer to documentation.
When to use this code
Use M05.432 when the record clearly states rheumatoid arthritis of the left wrist and rheumatoid myopathy together. You should code it when the provider links the muscle disorder to the rheumatoid condition and specifies the left wrist.
If the note mentions rheumatoid arthritis without muscle involvement, or weakness without a documented rheumatoid cause, this code is not appropriate. Check documentation for laterality and the exact wording.
Do not use for
Do not use this code for rheumatoid arthritis of another joint, unspecified wrist, or non-rheumatoid myopathy. Do not assume left-sided involvement unless it is documented.
Coding tip
Verify both the rheumatoid myopathy and left wrist laterality in the provider note before assigning M05.432.