ICD-10 Code M02.312 – Reiter’s disease, left shoulder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.312 – Reiter’s disease, left shoulder
What it is
M02.312 identifies Reiter’s disease, also called reactive arthritis, affecting the left shoulder. Use it when the chart documents reactive arthritis in that specific joint.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include joint pain, swelling, stiffness, and reduced range of motion in the left shoulder, with signs of inflammatory arthritis.
When to use this code
Use M02.312 when the provider clearly documents Reiter’s disease or reactive arthritis in the left shoulder. Apply it when the condition is localized to that joint and laterality is specified.
If the record mentions reactive arthritis without site or laterality, check documentation before coding. Make sure the shoulder involvement is not described as another inflammatory arthropathy or a nonspecific joint pain diagnosis.
Do not use for
Do not use this code for shoulder pain alone, unspecified arthritis, or reactive arthritis in a different joint. Check documentation if the diagnosis is uncertain or laterality is not recorded.
Coding tip
Confirm both the reactive arthritis diagnosis and left shoulder laterality in the provider note before assigning M02.312.