ICD-10 Code M02.30 – Reiter’s disease, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.30 – Reiter’s disease, unspecified site
What it is
M02.30 identifies Reiter’s disease, also called reactive arthritis, when the affected site is not specified in the record. Use it for a documented diagnosis without a more precise joint or site detail.
Clinical signs
Typical findings include joint pain, swelling, and stiffness after an infection, often with asymmetric lower-limb involvement. Clinical features vary; refer to documentation.
When to use this code
Use M02.30 when the provider documents Reiter’s disease or reactive arthritis but does not identify the involved site. It is also appropriate when the note confirms the diagnosis and the location remains unspecified after review. If the record names a specific joint or site, code that detail instead.
Do not use for
Do not use this code for arthritis with a clearly documented specific site or for other inflammatory arthritides. Check documentation if the note describes a different postinfectious or autoimmune joint condition.
Coding tip
Always look for the exact site in the assessment, imaging, or problem list before choosing the unspecified code.