ICD-10 Code M02.362 – Reiter’s disease, left knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.362 – Reiter’s disease, left knee
What it is
M02.362 identifies Reiter’s disease, also called reactive arthritis, affecting the left knee. It is used when the condition is documented as involving that specific joint.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include joint pain, swelling, stiffness, and reduced range of motion in the left knee.
When to use this code
Use this code when the provider documents Reiter’s disease or reactive arthritis limited to the left knee. You should select it when the laterality is clearly stated in the record.
If the note only says reactive arthritis without a specified joint, check documentation before coding. Confirm that the left knee is the affected site and not another joint.
Do not use for
Do not use this code for arthritis of the left knee without a documented Reiter’s disease or reactive arthritis diagnosis. Do not substitute it when the affected side is not specified.
Coding tip
Always verify both the diagnosis and laterality in the provider note before assigning M02.362.