Z23

Encounter for immunization

Factors influencing health status and contact with health services Billable
Quick Reference
Vaccination administration as primary or sole reason for encounter

Clinical Information

When to Use This Code

Vaccination administration as primary or sole reason for encounter

Common Clinical Scenarios

  • Flu shot administration
  • COVID-19 vaccination
  • Pneumococcal vaccine
  • Shingles vaccine administration
  • Tdap booster

Documentation Requirements

  • Specify vaccine type and brand (use CVX codes)
  • Document lot number and expiration date
  • Record injection site and route
  • Provide VIS (Vaccine Information Statement) and document patient acceptance
  • Note any adverse reactions

Coding Guidelines

Inclusion Terms

These terms are included in this code:

VaccinationImmunizationProphylactic vaccine administration

Exclusion Terms

Do NOT use this code for:

  • Need for immunization (Z28.-)
  • Immunization not carried out (Z28.-)

Coding Notes

Use CPT 90471-90474 for vaccine administration
Use specific vaccine CPT codes (90630-90759) for product
Medicare Part B covers many vaccines without cost-sharing

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Code Details

Code
Z23
Category
Factors influencing health status and contact with health services
Billable Status
Billable

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