Official ICD-10-CM description: Encounter for immunization
Common questions
Is Z23 a billable code?
Yes. Z23 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.
Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. About BillingBrief and our sources.
