Z28
Header — not billableImmunization not carried out and underimmunization status
The ICD-10 code for immunization not carried out and underimmunization status is Z28.
Z28 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 6 more specific codes below.
Clinical notes
Code also
Two codes may be needed to fully describe a condition, but unlike Code First/Use Additional Code, the sequencing order is not mandated by convention.
- , if applicable, encounter for immunization safety counseling (Z71.85)
Includes
Terms listed here further define or give examples of the conditions grouped under this code — they describe what the code covers, not a separate diagnosis.
- vaccination not carried out
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under Z28
- Z28.0Immunization not carried out because of contraindicationnon-billable header
- Z28.1Immunization not carried out because of patient decision for reasons of belief or group pressure
- Z28.2Immunization not carried out because of patient decision for other and unspecified reasonnon-billable header
- Z28.3Underimmunization statusnon-billable header
- Z28.8Immunization not carried out for other reasonnon-billable header
- Z28.9Immunization not carried out for unspecified reason
Related codes in this category
- Z20Contact with and (suspected) exposure to communicable diseasesnon-billable header
- Z21Asymptomatic human immunodeficiency virus [HIV] infection status
- Z22Carrier of infectious diseasenon-billable header
- Z23Encounter for immunization
- Z29Encounter for other prophylactic measuresnon-billable header
- Z28Immunization not carried out and underimmunization statusnon-billable header