ICD-10 Code M02.342 – Reiter’s disease, left hand (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.342 – Reiter’s disease, left hand
What it is
M02.342 identifies Reiter’s disease, also called reactive arthritis, affecting the left hand. Use it when documentation specifies this postinfectious inflammatory arthritis in that exact hand.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include joint pain, swelling, stiffness, and reduced hand motion, with inflammatory arthritis affecting the left hand.
When to use this code
Use this code when the provider documents Reiter’s disease or reactive arthritis limited to the left hand. It is appropriate when laterality is stated and the condition is recorded as involving that site. Check documentation if the hand involvement is unclear or if another joint is the primary site.
Do not use for
Do not use this code for unspecified hand involvement or for arthritis in the right hand or both hands. Do not use it if the record does not support Reiter’s disease.
Coding tip
Verify both the diagnosis and laterality in the note before assigning M02.342.