ICD-10-CM · Chapter 21 · Z00-Z99
Z23 Encounter for immunization
Notes
- procedure codes are required to identify the types of immunizations given
Code Also
- , if applicable, encounter for immunization safety counseling (Z71.85)
Code First
- any routine childhood examination
This category is a complete, billable diagnosis code.
No additional specificity is required — submit Z23 directly on claims and documentation without a subcode extension.
Plain-language terms for this code
The following entries in the US Medical Glossary correspond to ICD-10-CM category Z23:
- Immunization Schedule — Calendario de vacunación
- Childhood Vaccines — Vacunas infantiles
Last reviewed: September 2026