ICD-10-CM
ICD-10 code for Encounter for immunization: Z23
The closest CDC title for "Encounter for immunization" is Z23, Encounter for immunization. Z23 is a billable code.
Source: CDC ICD-10-CM FY2027 order file dated June 16, 2026. Publisher page
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Codes under Z23, then other CDC titles that name encounter for immunization
A header groups codes and is not billed. A billable code is one you can report.
Code first
The CDC tabular list says to report the code named here before this one.
Code first any routine childhood examination
Code also
The CDC tabular list says a second code may be needed with this one. The note does not set which is listed first.
Code also, if applicable, encounter for immunization safety counseling (Z71.85)
Related pages
Questions
What is the ICD-10 code for Encounter for immunization?
The closest CDC title for "Encounter for immunization" is Z23, Encounter for immunization. Z23 is a billable code.
Is Z23 billable?
Yes. Z23 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What chapter is Z23 in?
Chapter 21. Factors influencing health status.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.