ICD-10 Code M05.04 – Felty’s syndrome, hand (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.04 – Felty’s syndrome, hand
What it is
M05.04 identifies Felty’s syndrome involving the hand, a rheumatoid arthritis–related condition affecting the joints and surrounding tissues. Use it when documentation specifically links Felty’s syndrome to the hand.
Clinical signs
Clinical features vary; refer to documentation. Hand involvement may include chronic joint swelling, pain, stiffness, deformity, or reduced range of motion in a patient with rheumatoid disease.
When to use this code
Use this code when the provider documents Felty’s syndrome with hand involvement, or clearly identifies the hand as the affected site. It is appropriate when the record supports a specific diagnosis rather than nonspecific arthralgia or swelling. Check documentation if the site or syndrome is unclear.
Do not use for
Do not use this code for generic rheumatoid arthritis without Felty’s syndrome, or for hand pain without a documented diagnosis. If the record does not specify hand involvement, check documentation.
Coding tip
Code the most specific documented site and confirm that Felty’s syndrome is explicitly stated in the chart.