ICD-10 Code M02.31 – Reiter’s disease, shoulder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.31 – Reiter’s disease, shoulder
What it is
M02.31 identifies reactive arthritis affecting the shoulder. Use it when the record specifically documents Reiter’s disease or reactive arthritis in the shoulder joint.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include joint pain, swelling, stiffness, and reduced shoulder motion, with inflammatory arthritis noted after an infection.
When to use this code
Use this code when the provider documents Reiter’s disease, reactive arthritis, or postinfectious arthritis involving the shoulder. It is appropriate when the shoulder is the stated site and no more specific laterality or manifestation is recorded.
If the note says only arthritis, shoulder pain, or unspecified inflammatory joint disease, check documentation before coding M02.31. Confirm the diagnosis is reactive arthritis rather than another arthropathy.
Do not use for
Do not use this code for nonspecific shoulder pain, osteoarthritis, or rheumatoid arthritis. Do not assign it if reactive arthritis is not documented or the affected joint is different.
Coding tip
Code M02.31 only when the provider clearly links reactive arthritis to the shoulder; otherwise, query or check documentation.