Z28
⚠ Non-billable (Header)Immunization not carried out and underimmunization status
Factors influencing health status and contact with health services (Z00-Z99)
⚠️ This is a category header code — not billable. Use a more specific child code below.
✅ Includes
- • vaccination not carried out
Child Codes (6)
Z28.0Immunization not carried out because of contraindicationZ28.1Immunization not carried out because of patient decision for reasons of belief or group pressureZ28.2Immunization not carried out because of patient decision for other and unspecified reasonZ28.3Underimmunization statusZ28.8Immunization not carried out for other reasonZ28.9Immunization not carried out for unspecified reason
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CodeZ28
BillableNo — Header code
CategoryFactors influencing health status and contact with health services (Z00-Z99)
Excludes10 rule(s)
Excludes20 note(s)
Child codes6
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)