ICD-10 Code M05.021 – Felty’s syndrome, right elbow (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.021 – Felty’s syndrome, right elbow
What it is
This code identifies Felty’s syndrome affecting the right elbow. It combines rheumatoid arthritis with the Felty’s syndrome diagnosis and specifies the right elbow as the involved site.
Clinical signs
Clinical features vary; refer to documentation. Felty’s syndrome is classically associated with longstanding rheumatoid arthritis, splenomegaly, and neutropenia, but you should code only what the record supports.
When to use this code
Use this code when the provider documents Felty’s syndrome and specifically links it to the right elbow. It is appropriate when the encounter reflects rheumatoid involvement at that joint rather than a general arthritis history. Check documentation if the laterality or joint site is unclear.
Do not use for
Do not use this code for rheumatoid arthritis without Felty’s syndrome, or for elbow pain alone. Do not assume the right side unless the documentation clearly states it.
Coding tip
Confirm both the Felty’s syndrome diagnosis and the right elbow laterality in the note before assigning M05.021.