ICD-10-CM category
Z23: Encounter for immunization
Z23 is “Encounter for immunization”. It has no subcodes in this category.
Frequently asked questions
What is ICD-10-CM code Z23?
Z23 is the ICD-10-CM code for Encounter for immunization.
Is Z23 billable?
Yes — Z23 is a valid, billable ICD-10-CM code (it has no further subdivisions).
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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