ICD-10 Code M05.059 – Felty’s syndrome, unspecified hip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.059 – Felty’s syndrome, unspecified hip
What it is
M05.059 identifies Felty’s syndrome affecting the hip, with the hip site not otherwise specified. It is used when rheumatoid arthritis with Felty’s syndrome is documented and the provider does not specify the laterality.
Clinical signs
Clinical features vary; refer to documentation. Felty’s syndrome is classically associated with rheumatoid arthritis, splenomegaly, and neutropenia, but the coded diagnosis here is limited to the unspecified hip site.
When to use this code
Use this code when the record documents Felty’s syndrome involving the hip and no right or left side is stated. It may appear in assessments, problem lists, or specialist notes that link the syndrome to hip involvement. If the laterality is documented elsewhere, code that specific option instead.
Do not use for
Do not use this code for rheumatoid arthritis without Felty’s syndrome, or for hip pain without a documented diagnosis. Check documentation if the note only mentions arthritis, splenomegaly, or neutropenia separately.
Coding tip
Confirm that both the syndrome and the hip site are documented before assigning M05.059.