ICD-10 Code M05.09 – Felty’s syndrome, multiple sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.09 – Felty’s syndrome, multiple sites
What it is
M05.09 identifies Felty’s syndrome affecting multiple sites. It is used when rheumatoid arthritis is documented with the Felty’s syndrome complication and the record specifies more than one site.
Clinical signs
Typical findings include long-standing rheumatoid arthritis with splenomegaly and neutropenia. Clinical features vary; refer to documentation for the exact sites involved and any supporting exam or lab evidence.
When to use this code
Use this code when the provider documents Felty’s syndrome and clearly indicates multiple sites. Apply it only when the chart supports the rheumatoid arthritis association and site-specific involvement is recorded.
If the note says Felty’s syndrome without site detail, or if the condition is limited to a single site, check documentation before coding. You should code the most specific documented description available.
Do not use for
Do not use this code for rheumatoid arthritis without Felty’s syndrome, or for unspecified site documentation. Check documentation if the record describes another complication or a different rheumatoid arthritis manifestation.
Coding tip
Confirm both the Felty’s syndrome diagnosis and the “multiple sites” wording in the provider note before assigning M05.09.