Z23 – Encounter for immunization
ICD-10-CM 2027 diagnosis code · Persons with potential health hazards related to communicable diseases
ICD-10-CM code
Z23
- Code
Z23(claims format:Z23)- Description
- Encounter for immunization
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 21. Factors influencing health status and contact with health services (Z00-Z99)
- Block
- Z20-Z29 Persons with potential health hazards related to communicable diseases
Notes for Z23
Code first:
- any routine childhood examination
Code also:
- , if applicable, encounter for immunization safety counseling (Z71.85)
Notes:
- procedure codes are required to identify the types of immunizations given
Index terms for Z23
Entries in the ICD-10-CM alphabetic index that lead to this code:
Frequently asked questions
What is ICD-10 code Z23?
Z23 is the ICD-10-CM code for encounter for immunization, in the block Z20-Z29 (Persons with potential health hazards related to communicable diseases).
Is Z23 a billable code?
Yes. Z23 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.