---
title: "ICD-10-CM Z23: Encounter for immunization | BillingBrief"
description: "ICD-10-CM code Z23: Encounter for immunization. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/z23/"
language: "en"
---

# Z23 Encounter for immunization

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Encounter for immunization

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Note

-   procedure codes are required to identify the types of immunizations given

### Code first

Code the underlying condition first, then this code.

-   any routine childhood examination

### Code also

A second code may be needed. Sequencing depends on the encounter.

-   , if applicable, encounter for immunization safety counseling ([Z71.85](https://billingbrief.com/icd10/z71.85/))

## 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.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

Z23 Encounter for immunization

Chapter

Factors influencing health status and contact with health services

Billable

Yes

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](https://billingbrief.com/about/).