ICD-10 Code M02.26 – Postimmunization arthropathy, knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.26 – Postimmunization arthropathy, knee
What it is
M02.26 identifies joint inflammation or pain in the knee that occurs after immunization. Use it when documentation links the knee arthropathy directly to a vaccine or other immunization event.
Clinical signs
Typical findings include knee pain, swelling, stiffness, and reduced range of motion after immunization. Clinical features vary; refer to documentation for the timing and the documented causal relationship.
When to use this code
Use M02.26 when the provider documents postimmunization arthropathy affecting the knee as the diagnosis. It fits encounters where the knee symptoms are attributed to a recent immunization rather than another arthritic condition. Code the documented laterality only if the record supports it.
Do not use for
Do not use this code for nonspecific knee pain, routine post-vaccine soreness, or arthritis with no documented link to immunization. Check documentation if the chart suggests another cause.
Coding tip
Verify that the record explicitly connects the knee arthropathy to immunization before assigning M02.26.