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.
Includes
Vaccination not carried out
Code also
If applicable, encounter for immunization safety counseling (Z71.85)
Codes
Z28.0
Immunization not carried out because of 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
Z28.3
Underimmunization status
Z28.8
Immunization not carried out for other reason
Z28.9
Immunization not carried out for unspecified reason
Versions
2026
No changes
2025
No changes
2024
No changes
2023
No changes
2022
Code changed
Code also
- , if applicable, encounter for immunization safety counseling (Z71.85)
2021
No changes
2020
No changes
2019
No changes
2018
No changes
2017
No changes
2016
New code