ICD-10-CM Z28: Immunization not carried out and underimmunization status

ICD-10-CM Diagnosis Code (2025)

Official Description for Z28

Immunization not carried out and underimmunization status

Coding Notes & Guidelines for Z28

Includes Notes

vaccination not carried out

Excludes1: Not Coded Here

immunization not carried out because of caregiver refusal because of religious belief (Z28.1)

Use Additional Code
  • code, if applicable, to identify:
  • immunization not carried out because of contraindication (Z28.0-)
  • immunization not carried out because of patient decision for other and unspecified reason (Z28.2-)
  • immunization not carried out because of patient decision for reasons of belief or group pressure (Z28.1)
  • immunization not carried out for other reason (Z28.8-)
Inclusion Terms

Immunization not carried out because of religious belief

Inclusion Terms
  • Delinquent immunization status
  • Lapsed immunization schedule status
Inclusion Terms
  • Immunization not carried out because of guardian refusal
  • Immunization not carried out because of parent refusal
Inclusion Terms
  • Delay in delivery of vaccine
  • Lack of availability of vaccine
  • Manufacturer delay of vaccine
Code Also

, if applicable, encounter for immunization safety counseling (Z71.85)

Child Codes (More Specific Codes for Z28):

Z28.0 - Immunization not carried out because of contraindication Z28.01 - Immunization not carried out because of acute illness of patient Z28.02 - Immunization not carried out because of chronic illness or condition of patient Z28.03 - Immunization not carried out because of immune compromised state of patient Z28.04 - Immunization not carried out because of patient allergy to vaccine or component Z28.09 - Immunization not carried out because of other contraindication Z28.1 - Immunization not carried out because of patient decision for reasons of belief or group pressure Z28.2 - Immunization not carried out because of patient decision for other and unspecified reason Z28.20 - Immunization not carried out because of patient decision for unspecified reason Z28.21 - Immunization not carried out because of patient refusal Z28.29 - Immunization not carried out because of patient decision for other reason Z28.3 - Underimmunization status Z28.31 - Underimmunization for COVID-19 status Z28.310 - Unvaccinated for COVID-19 Z28.311 - Partially vaccinated for COVID-19 Z28.39 - Other underimmunization status Z28.8 - Immunization not carried out for other reason Z28.81 - Immunization not carried out due to patient having had the disease Z28.82 - Immunization not carried out because of caregiver refusal Z28.83 - Immunization not carried out due to unavailability of vaccine Z28.89 - Immunization not carried out for other reason Z28.9 - Immunization not carried out for unspecified reason

About ICD-10-CM Code Z28 (Immunization not carried out and underimmunization status)

ICD-10-CM code Z28 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM Z28 became effective on October 1, 2024.

This page provides detailed information about Z28 - Immunization not carried out and underimmunization status. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Immunization not carried out and underimmunization status.