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Z28.9 ICD-10-CA code: Immunization not carried out for unspecified reason

Z28.9 is the ICD-10-CA code for “Immunization not carried out for unspecified reason” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

Z28.9

Immunization not carried out for unspecified reason

Short description: Immuniz not carried out for unsp reason

ICD-10-CA · Canada · Also written Z289

Index terms

Entries in CIHI’s alphabetical index that lead to Z28.9. Searching the index by the condition the note names is how coders reach this code.

  • Vaccination, not done
  • Cancelled procedure (surgical), vaccination

Notes for Z28.9

As CIHI prints them, with any note Z28.9 takes from the headings above it.

Note

  • This chapter should not be used for international comparison or for primary mortality coding.Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as "diagnoses" or "problems". This can arise in two main ways:(a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination or to discuss a problem which is in itself not a disease or injury.(b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury. Such factors may be elicited during population surveys, when the person may or may not be currently sick, or be recorded as an additional factor to be borne in mind when the person is receiving care for some illness or injury.From Chapter 21: Factors influencing health status and contact with health services (Z00-Z99)

Where Z28.9 sits

  1. 1ChapterChapter 21: Factors influencing health status and contact with health services (Z00-Z99)
  2. 2Block Z20-Z29Persons with potential health hazards related to communicable diseases
  3. 3Category Z28Immunization not carried out
  4. 4Valid code Z28.9Immunization not carried out for unspecified reason

Source and release

Data release
ICD-10-CA · FY 2026–2027
Effective date
Apr 1, 2026
Publisher
CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See Z28.9 in the CIHI source

Frequently asked questions

What does ICD-10-CA code Z28.9 mean?

Z28.9 is the ICD-10-CA code for “Immunization not carried out for unspecified reason” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is Z28.9 in ICD-10-CA?

Z28.9 sits under Z28 Immunization not carried out, within Z20-Z29 Persons with potential health hazards related to communicable diseases, within Chapter 21: Factors influencing health status and contact with health services (Z00-Z99).

What coding notes apply to Z28.9?

ICD-10-CA lists Note notes for Z28.9, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

Codes beside Z28.9

Z28.0Immunization not carried out because of contraindicationZ28.1Immunization not carried out because of patient's decision for reasons of belief or group pressureZ28.2Immunization not carried out because of patient's decision for other and unspecified reasonsZ28.8Immunization not carried out for other reasons