ICD-10 Code M02.21 – Postimmunization arthropathy, shoulder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.21 – Postimmunization arthropathy, shoulder
What it is
M02.21 identifies joint inflammation in the shoulder that occurs after immunization. Use it when the record links the shoulder arthropathy directly to a vaccine or other immunization event.
Clinical signs
Typical findings include shoulder pain, stiffness, swelling, and reduced range of motion after vaccination. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents postimmunization arthropathy affecting the shoulder and the causal relationship is clear. It fits cases where the shoulder joint symptoms are attributed to the vaccine rather than a separate injury or chronic arthritis. Check documentation if the affected side or timing is unclear.
Do not use for
Do not use this code for general post-vaccination soreness without documented arthropathy. Also avoid it when the shoulder problem is due to trauma, infection, or another diagnosed joint disorder.
Coding tip
Confirm that the note states both the postimmunization cause and the shoulder site before assigning M02.21.