ICD-10 Code M02.80 – Other reactive arthropathies, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.80 – Other reactive arthropathies, unspecified site
What it is
M02.80 identifies a reactive arthropathy when the provider does not specify the affected joint or site. It refers to joint inflammation that follows an infection elsewhere in the body.
Clinical signs
Typical findings include joint pain, swelling, stiffness, and reduced motion. Clinical features vary; refer to documentation, especially for evidence of a recent triggering infection.
When to use this code
Use M02.80 when the record documents reactive arthropathy but does not name a specific joint or site. Choose it for unspecified joint involvement after an infectious episode when no more precise code is supported.
If the provider identifies the affected site, code that more specific site instead. Check documentation when the chart only says “reactive arthritis” or uses another related term without location detail.
Do not use for
Do not use this code for reactive arthropathy with a specified site, or for other inflammatory arthritides that are separately documented. Check documentation if the diagnosis is unclear.
Coding tip
Assign M02.80 only when site is truly unspecified; if a joint is named anywhere in the record, code the specified site instead.