ICD-10 Code M02.371 – Reiter’s disease, right ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.371 – Reiter’s disease, right ankle and foot
What it is
M02.371 identifies Reiter’s disease, also called reactive arthritis, affecting the right ankle and foot. It indicates an inflammatory joint condition linked to a prior infection, with the site documented as the right ankle and foot.
Clinical signs
Typical findings include joint pain, swelling, stiffness, and reduced range of motion in the affected area. Clinical features vary; refer to documentation for the specific presentation and any associated post-infectious history.
When to use this code
Use this code when the provider documents Reiter’s disease or reactive arthritis in the right ankle and foot. It fits cases where the laterality and joint location are clearly stated in the record. If the note does not specify the right side, check documentation.
Do not use for
Do not use this code for unspecified ankle or foot arthritis, or for inflammatory arthritis without documented Reiter’s disease. If the condition is on the left side or bilateral, use the appropriate code instead.
Coding tip
Verify both the diagnosis and laterality in the provider note before assigning M02.371.