ICD-10 Code M02 – Postinfective and reactive arthropathies (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02 – Postinfective and reactive arthropathies
What it is
M02 identifies postinfective and reactive arthropathies, a group of joint disorders that develop after an infection elsewhere in the body. Use it when the record shows a reactive arthritis pattern rather than a primary joint disease.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include joint pain, swelling, and stiffness after a recent genitourinary or gastrointestinal infection, with involvement of one or more joints.
When to use this code
Use M02 when the provider documents reactive arthritis, postinfective arthropathy, or a similar diagnosis linked to a preceding infection. It may also fit when the chart clearly connects the joint condition to a known infectious trigger. Check documentation for the specific type and site if the record is more detailed.
Do not use for
Do not use this code for ordinary osteoarthritis, rheumatoid arthritis, or septic arthritis. If the note does not establish a postinfective or reactive cause, check documentation before assigning M02.
Coding tip
Assign the most specific M02 subcode available and verify the documented infection trigger when the record supports it.