New ICD Codes for Under-Immunized Status
Ann Finn
Effective April 1, 2022: Two new ICD-10-CM codes have been created for under-immunization for COVID-19 status:
Z28.310 Unvaccinated for COVID-19
Z28.311 Partially vaccinated for COVID-19
A third new code describes other underimmunization status:
Z28.39 Other underimmunization status
Additional codes are assigned, if applicable, to provide additional reasons for underimmunization, such as contraindication (Z28.0-) or the patient’s decision for reasons of belief or group pressure (Z28.1).
The new code for “other underimmunization status” includes delinquent immunization status and lapsed immunization schedule status.
The new codes for underimmunization for COVID-19 status should not be assigned for individuals who are not eligible for the COVID-19 vaccines (e.g., children under age 5).
The ICD-10-CM Official Guidelines for Coding and Reporting have been updated to provide guidance regarding the use of the new ICD-10-CM codes. Code Z28.310, Unvaccinated for COVID-19, may be assigned when the patient has not received at least one dose of any COVID-19 vaccine. Code Z28.311, Partially vaccinated for COVID-19, may be assigned when the patient has received at least one dose of a multi-dose COVID-19 vaccine regimen but has not received the full set of doses necessary to meet the CDC’s definition of “fully vaccinated” in place at the time of the encounter.
https://journal.ahima.org/page/new-icd-10-cm-pcs-codes-become-effective-april-1