ICD-10 Code M02.37 – Reiter’s disease, ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.37 – Reiter’s disease, ankle and foot
What it is
M02.37 identifies Reiter’s disease, also called reactive arthritis, affecting the ankle and foot. It is used when the inflammatory joint condition is documented in these locations.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include joint pain, swelling, and stiffness in the ankle or foot, often with an inflammatory pattern.
When to use this code
Use M02.37 when the provider documents Reiter’s disease or reactive arthritis involving the ankle and foot. Apply it when the diagnosis is specific to these joints, not just generalized lower-extremity pain.
If the record describes multiple affected joints, code the documented sites as directed by the chart. Check documentation when laterality or exact joint involvement is unclear.
Do not use for
Do not use this code for nonspecific ankle pain, osteoarthritis, or traumatic joint injury. If reactive arthritis is not documented, check documentation before assigning M02.37.
Coding tip
Code only when the ankle or foot involvement is clearly stated in the medical record.