ICD-10 Code M05.57 – Rheumatoid polyneuropathy with rheumatoid arthritis of ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.57 – Rheumatoid polyneuropathy with rheumatoid arthritis of ankle and foot
What it is
This code identifies rheumatoid arthritis affecting the ankle or foot together with rheumatoid polyneuropathy. Use it when the record shows both joint disease and nerve involvement linked to rheumatoid disease.
Clinical signs
Typical findings include inflammatory joint pain, swelling, stiffness, and limited motion in the ankle or foot, plus peripheral neuropathy symptoms such as numbness, tingling, burning, or weakness. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents rheumatoid arthritis of the ankle or foot and also states polyneuropathy due to rheumatoid disease. It supports coding of the combined manifestation, not just isolated joint or nerve symptoms. Check documentation if the neuropathy cause is unclear.
Do not use for
Do not use this code for rheumatoid arthritis without documented polyneuropathy, or for neuropathy from diabetes, compression, or other causes. If the ankle or foot site is not specified, check documentation.
Coding tip
Confirm that both the rheumatoid arthritis site and the neuropathy relationship are documented before assigning this code.