ICD-10 Code M05.521 – Rheumatoid polyneuropathy with rheumatoid arthritis of right elbow (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.521 – Rheumatoid polyneuropathy with rheumatoid arthritis of right elbow
What it is
This code identifies rheumatoid arthritis affecting the right elbow, with associated polyneuropathy. It tells you the patient has both inflammatory joint disease and nerve involvement documented together.
Clinical signs
Findings may include right elbow pain, swelling, stiffness, and reduced range of motion, along with sensory or motor changes from polyneuropathy. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly links rheumatoid arthritis of the right elbow with polyneuropathy. It is appropriate when the provider documents both conditions as current and related in the same encounter. If laterality or the neuropathy association is unclear, check documentation.
Do not use for
Do not use this code for rheumatoid arthritis without nerve involvement, or for neuropathy not documented as associated with rheumatoid arthritis. Do not assign it if the elbow side is not confirmed.
Coding tip
Verify the provider’s wording for both the rheumatoid arthritis site and the neuropathy link before coding.