Z28 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Immunization not carried out and underimmunization status.
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Vaccination not carried out
If applicable, encounter for immunization safety counseling (Z71.85)
Immunization not carried out because of contraindication
Immunization not carried out because of patient decision for reasons of belief or group pressure
Immunization not carried out because of patient decision for other and unspecified reason
Underimmunization status
Immunization not carried out for other reason
Immunization not carried out for unspecified reason
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