Z23

Billable

Encounter for immunization

Z23 is the ICD-10-CM code for Encounter for immunization. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
Z00-Z99
Edition
FY2026

Z00-Z99 Factors influencing health status and contact with health services

What this means — in plain language

MedlinePlus · NIH

What are vaccines? Vaccines are injections (shots), liquids, pills, or nasal sprays that you take to teach your body's immune system to recognize and defend against harmful germs. For example, there are vaccines to protect against diseases caused by: Viruses , like the ones that cause the flu and COVID-19 Bacteria , including tetanus, diphtheria, and pertussis What are the types of vaccines? There are several types…

Read more about Vaccines at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Code first

  • any routine childhood examination

Notes

  • procedure codes are required to identify the types of immunizations given
  • , if applicable, encounter for immunization safety counseling (Z71.85)

Frequently asked questions

What is ICD-10 code Z23?
Z23 is the ICD-10-CM code for "Encounter for immunization". It falls under Z00-Z99 Factors influencing health status and contact with health services.
Is Z23 a billable code?
Yes — Z23 is a billable, specific ICD-10-CM code valid for reimbursement.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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