ICD-10 Code M05.0 – Felty’s syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.0 – Felty’s syndrome
What it is
Felty’s syndrome is a complication of rheumatoid arthritis marked by an enlarged spleen and low white blood cell count. Use this code when the record clearly identifies the syndrome.
Clinical signs
Typical findings include long-standing rheumatoid arthritis, splenomegaly, and neutropenia. Clinical features vary; refer to documentation.
When to use this code
Use M05.0 when the provider documents Felty’s syndrome by name, or clearly describes rheumatoid arthritis with splenomegaly and neutropenia. Code it only when the syndrome is established in the chart. Check documentation if the note mentions arthritis complications without confirming Felty’s syndrome.
Do not use for
Do not use this code for rheumatoid arthritis alone, isolated splenomegaly, or neutropenia without Felty’s syndrome. Check documentation when the diagnosis is uncertain.
Coding tip
Confirm that the provider links the findings to Felty’s syndrome before assigning M05.0.