ICD-10 Code M05.559 – Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified hip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.559 – Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified hip
What it is
This code identifies rheumatoid arthritis affecting an unspecified hip, with associated polyneuropathy. Use it when the record documents both the rheumatoid joint disease and nerve involvement, but does not specify which hip is involved.
Clinical signs
Expect inflammatory joint findings in rheumatoid arthritis, plus peripheral nerve symptoms such as numbness, tingling, weakness, or reduced sensation. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents rheumatoid arthritis with polyneuropathy and only an unspecified hip is named. It is appropriate when the hip laterality is not stated, or the note confirms hip involvement without further detail. Check documentation if the neuropathy is not clearly linked to rheumatoid arthritis.
Do not use for
Do not use it for rheumatoid arthritis without nerve involvement, or for neuropathy from another cause. Also avoid it when the hip side is specified and another more precise code applies.
Coding tip
Confirm both the rheumatoid arthritis relationship and the unspecified hip documentation before assigning M05.559.