ICD-10 Code M05.07 – Felty’s syndrome, ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M05.07 – Felty’s syndrome, ankle and foot
What it is
M05.07 identifies Felty’s syndrome involving the ankle and foot. It is used when rheumatoid arthritis is associated with this specific joint involvement; confirm the exact site in the record.
Clinical signs
Clinical features vary; refer to documentation. You may see chronic inflammatory joint pain, swelling, stiffness, or deformity in the ankle or foot, along with findings consistent with Felty’s syndrome.
When to use this code
Use this code when the provider documents Felty’s syndrome affecting the ankle and foot, or clearly links the syndrome to those joints. It is appropriate when the record specifies the site rather than a general rheumatoid arthritis diagnosis.
If the note only states Felty’s syndrome without joint location, or describes another joint, do not assume M05.07. Check documentation for laterality, anatomic site, and the exact diagnostic wording.
Do not use for
Do not use this code for unspecified Felty’s syndrome or for rheumatoid arthritis without documented ankle or foot involvement. Check documentation if the condition is described as affecting a different joint.
Coding tip
Match the code to the documented anatomic site exactly; if the ankle and foot are not named, query the provider.