ICD-10 Code M02.3 – Reiter’s disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.3 – Reiter’s disease
What it is
M02.3 identifies Reiter’s disease, a form of reactive arthritis that develops after an infection. Use it when documentation names this condition specifically.
Clinical signs
Common findings include arthritis with joint pain and swelling, often affecting the lower limbs. Clinical features vary; refer to documentation for the documented pattern and any associated extra-articular findings.
When to use this code
Use M02.3 when the provider documents Reiter’s disease or reactive arthritis with that specific label. Code it from the medical record, not from suspected post-infectious joint symptoms alone. If the note only says arthritis after infection, check documentation for a confirmed diagnosis.
Do not use for
Do not use this code for rheumatoid arthritis, septic arthritis, or nonspecific arthralgia. If the diagnosis is unclear or different, check documentation and select the confirmed condition.
Coding tip
Look for the exact provider wording, because M02.3 depends on documented Reiter’s disease rather than a general history of infection.