ICD-10-CM > Z00-Z99 > Z20-Z29 > Z28 > Z28.8 Z28.8 Immunization not carried out for other reason Non-Billable/Non-Specific Codes Z28.81Immunization not carried out due to patient having had the diseaseZ28.82Immunization not carried out because of caregiver refusalZ28.83Immunization not carried out due to unavailability of vaccineZ28.89Immunization not carried out for other reason