ICD-10 Code M05.561 – Rheumatoid polyneuropathy with rheumatoid arthritis of right knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.561 – Rheumatoid polyneuropathy with rheumatoid arthritis of right knee
What it is
This code identifies rheumatoid arthritis affecting the right knee, with associated polyneuropathy. Use it when the record documents both the joint disease and nerve involvement linked to rheumatoid arthritis.
Clinical signs
Findings may include inflammatory knee pain, swelling, stiffness, and reduced range of motion, along with symptoms of peripheral neuropathy such as numbness, tingling, or weakness. Clinical features vary; refer to documentation.
When to use this code
Use M05.561 when the provider clearly documents rheumatoid arthritis in the right knee and rheumatoid polyneuropathy. The diagnosis should support both the arthritic joint involvement and the neuropathic complication. If laterality or the neuropathy link is unclear, check documentation before coding.
Do not use for
Do not use this code for rheumatoid arthritis without documented polyneuropathy, or for neuropathy from another cause. Do not assign it when the affected knee is not the right knee. Check documentation.
Coding tip
Verify that the note links the neuropathy to rheumatoid arthritis and specifies the right knee before assigning M05.561.