ICD-10 Code M02.321 – Reiter’s disease, right elbow (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.321 – Reiter’s disease, right elbow
What it is
This code identifies Reiter’s disease, also called reactive arthritis, affecting the right elbow. Use it when the documentation specifies the elbow joint on the right side.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include inflammatory joint pain, swelling, stiffness, and limited motion in the affected elbow, consistent with reactive arthritis.
When to use this code
Use M02.321 when the provider documents Reiter’s disease or reactive arthritis limited to the right elbow. It is appropriate when the record clearly links the condition to that joint and laterality. Check documentation if the note only says arthritis without specifying reactive arthritis or the right elbow.
Do not use for
Do not use this code for arthritis in another joint, or when the side is not documented. It is also not for nonspecific elbow pain or other inflammatory arthritides.
Coding tip
Verify both the reactive arthritis diagnosis and the right-sided elbow location before assigning M02.321.