ICD-10 Code M05.43 – Rheumatoid myopathy with rheumatoid arthritis of wrist (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.43 – Rheumatoid myopathy with rheumatoid arthritis of wrist
What it is
This code identifies rheumatoid arthritis affecting the wrist with associated rheumatoid myopathy. It indicates both joint disease and muscle involvement are documented for the same wrist region.
Clinical signs
Typical findings include wrist pain, swelling, stiffness, and reduced range of motion, plus muscle weakness or wasting related to rheumatoid myopathy. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents rheumatoid arthritis of the wrist and specifies accompanying rheumatoid myopathy. It applies when the muscle involvement is part of the recorded diagnosis, not just generalized weakness. Check documentation if laterality or site details are unclear.
Do not use for
Do not use this code if the record shows rheumatoid arthritis of the wrist without myopathy, or myopathy from another cause. Do not assign it when the wrist site is not documented.
Coding tip
Confirm that both rheumatoid myopathy and wrist involvement are explicitly stated before assigning M05.43.