ICD-10 Code M02.20 – Postimmunization arthropathy, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.20 – Postimmunization arthropathy, unspecified site
What it is
This code identifies joint inflammation or pain that occurs after immunization, when the site is not specified. Use it for a post-vaccination arthropathy documented by the clinician.
Clinical signs
Findings may include joint pain, swelling, stiffness, or reduced range of motion after a vaccine. Clinical features vary; refer to documentation.
When to use this code
Use M02.20 when the record clearly links the arthropathy to a prior immunization and no specific joint is named. It also fits when the provider documents postimmunization arthropathy without further detail. Check documentation if the note instead describes a general adverse reaction or another joint disorder.
Do not use for
Do not use this code for routine post-shot soreness without a diagnosed arthropathy. Also avoid it when a specific joint is identified and a more precise code is available.
Coding tip
Code only when the provider documents a causal relationship to immunization and an arthropathy diagnosis.