Z28
Z28: Immunization not carried out and underimmunization status
Non-billable headerICD-10-CM
Z28 is a non-billable header ICD-10-CM code for immunization not carried out and underimmunization status. It cannot be billed on its own: choose one of the more specific child codes below.
Code also
Both codes may be needed to describe the encounter fully. Sequencing depends on the reason for the visit.
- , if applicable, encounter for immunization safety counseling (Z71.85)
Includes
Conditions this code covers.
- vaccination not carried out
Other codes that can never be billed with Z28
Their own Excludes1 notes name this code, so the conflict is not listed above.
- Z28.82Immunization not carried out because of caregiver refusal
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
6 child codes. Green means billable.
- 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
- Z28.3Underimmunization status
- Z28.8Immunization not carried out for other reason
- Z28.9Immunization not carried out for unspecified reason