ICD-10 Code M02.372 – Reiter’s disease, left ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.372 – Reiter’s disease, left ankle and foot
What it is
This code identifies Reiter’s disease, also called reactive arthritis, affecting the left ankle and foot. Use it when the condition is documented as involving that specific side and site.
Clinical signs
Typical findings include asymmetric joint pain, swelling, and stiffness, often in the lower extremity. Clinical features vary; refer to documentation, especially for evidence of reactive arthritis affecting the left ankle or foot.
When to use this code
Use M02.372 when the provider explicitly documents Reiter’s disease or reactive arthritis in the left ankle and foot. It is appropriate when the laterality and anatomic site are clearly stated in the record.
If the note only says arthritis, joint pain, or reactive arthropathy without naming Reiter’s disease, check documentation before coding. You should also confirm that the left ankle and foot are the involved sites.
Do not use for
Do not use this code for unspecified reactive arthritis, other joints, or right-sided involvement. Do not assign it when Reiter’s disease is not documented; check documentation.
Coding tip
Verify both the diagnosis wording and laterality in the provider note before selecting M02.372.