Z28.3
Z28.3: Underimmunization status
Non-billable headerICD-10-CM
Z28.3 is a non-billable header ICD-10-CM code for underimmunization status. It cannot be billed on its own: choose one of the more specific child codes below.
Use additional code
Add a secondary code to capture the detail described below.
- code, if applicable, to identify:
- immunization not carried out because of contraindication (Z28.0-)
- immunization not carried out because of patient decision for other and unspecified reason (Z28.2-)
- immunization not carried out because of patient decision for reasons of belief or group pressure (Z28.1)
- immunization not carried out for other reason (Z28.8-)
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead Z28.3
2 child codes. Green means billable.
Other codes under Z28
- Z28.0Immunization not carried out because of contraindication
- Z28.1Immunization not carried out because of patient decision for reasons of belief or group pressure
- Z28.2Immunization not carried out because of patient decision for other and unspecified reason
- Z28.8Immunization not carried out for other reason
- Z28.9Immunization not carried out for unspecified reason