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Z28 Immunization not carried out and underimmunization status

ICD-10-CM category Z28 sits in Chapter 21 (Factors influencing health status and contact with health services, Z00-Z99). It contains 17 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.

Subcategories

Z28.0 Immunization not carried out because of contraindicationZ28.2 Immuniz not crd out bec pt decision for oth and unsp reasonZ28.3 Underimmunization statusZ28.31 Underimmunization for COVID-19 statusZ28.8 Immunization not carried out for other reason

Billable codes in Z28

CodeDescription
Z28.01Immunization not carried out because of acute illness of patient
Z28.02Immunization not carried out because of chronic illness or condition of patient
Z28.03Immunization not carried out because of immune compromised state of patient
Z28.04Immunization not carried out because of patient allergy to vaccine or component
Z28.09Immunization not carried out because of other contraindication
Z28.1Immunization not carried out because of patient decision for reasons of belief or group pressure
Z28.20Immunization not carried out because of patient decision for unspecified reason
Z28.21Immunization not carried out because of patient refusal
Z28.29Immunization not carried out because of patient decision for other reason
Z28.310Unvaccinated for COVID-19
Z28.311Partially vaccinated for COVID-19
Z28.39Other underimmunization status
Z28.81Immunization not carried out due to patient having had the disease
Z28.82Immunization not carried out because of caregiver refusal
Z28.83Immunization not carried out due to unavailability of vaccine
Z28.89Immunization not carried out for other reason
Z28.9Immunization not carried out for unspecified reason

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