ICD-10-CM > Z00-Z99 > Z20-Z29 > Z28 > Z28.2 Z28.2 Immunization not carried out because of patient decision for other and unspecified reason Non-Billable/Non-Specific Codes Z28.20Immunization not carried out because of patient decision for unspecified reasonZ28.21Immunization not carried out because of patient refusalZ28.29Immunization not carried out because of patient decision for other reason