ICD-10 Code M06.07 – Rheumatoid arthritis without rheumatoid factor, ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M06.07 – Rheumatoid arthritis without rheumatoid factor, ankle and foot
What it is
This code identifies rheumatoid arthritis affecting the ankle and foot when rheumatoid factor is not present. Use it for a documented seronegative rheumatoid arthritis diagnosis in these joints.
Clinical signs
Typical findings include inflammatory joint pain, swelling, stiffness, and reduced range of motion in the ankle or foot. Clinical features vary; refer to documentation.
When to use this code
Use M06.07 when the provider documents rheumatoid arthritis without rheumatoid factor and specifies ankle and foot involvement. It fits confirmed seronegative disease in one or both of these areas. Check documentation if the record does not clearly identify the joint site.
Do not use for
Do not use this code for rheumatoid arthritis with positive rheumatoid factor, or when the affected site is not the ankle or foot. Check documentation if the diagnosis is unspecified.
Coding tip
Verify both the seronegative status and the anatomic site before assigning M06.07.