ICD-10 Code M05.05 – Felty’s syndrome, hip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.05 – Felty’s syndrome, hip
What it is
M05.05 identifies Felty’s syndrome affecting the hip. It indicates rheumatoid arthritis with the Felty’s syndrome complication, documented at the hip site.
Clinical signs
Clinical features vary; refer to documentation. Felty’s syndrome is typically associated with longstanding rheumatoid arthritis, splenomegaly, and neutropenia, and the hip may be painful, stiff, or inflamed.
When to use this code
Use this code when the provider documents Felty’s syndrome involving the hip, or when the hip is the specified joint site in the diagnosis. You should code it only when the record clearly links the syndrome to the hip.
Check documentation if the note mentions rheumatoid arthritis without Felty’s syndrome, or if the hip involvement is not explicitly stated. Do not infer the site from generalized joint pain.
Do not use for
Do not use this code for rheumatoid arthritis without Felty’s syndrome, or for hip pain alone. Check documentation if another joint, site, or complication is described instead.
Coding tip
Confirm both the Felty’s syndrome diagnosis and the hip site in the provider note before assigning M05.05.