Z23

ICD-10Billable

Encounter for immunization

Official ICD-10-CM descriptor (FY2026)

Encounter for immunization

Z23 is valid for submission on a claim: CMS flags it as a billable, specific code.

Code first

Sequence the underlying condition before this code.

any routine childhood examination

Code also

Two codes may be needed; sequencing depends on the reason for the encounter.

, if applicable, encounter for immunization safety counseling (Z71.85)

Notes

procedure codes are required to identify the types of immunizations given

Where this code sits

Chapter: 21. Factors influencing health status and contact with health services (Z00-Z99)
Block: Persons with potential health hazards related to communicable diseases (Z20-Z29)

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.