ICD-10 Diagnosis Code Z23

Encounter for immunization

Diagnosis Code Z23

ICD-10: Z23
Short Description: Encounter for immunization
Long Description: Encounter for immunization
This is the 2018 version of the ICD-10-CM diagnosis code Z23

Valid for Submission
The code Z23 is valid for submission for HIPAA-covered transactions.

Replaced Code Additional informationCallout TooltipReplaced Code
The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2017. This codes was replaced for the FY 2018 (October 1, 2017-September 30, 2018).

This code was replaced in the 2018 ICD-10 code set with the code(s) listed below.
  • Z29.11 - Enctr for prphylc immther for resp syncytial virus (RSV)
  • Z29.12 - Encounter for prophylactic antivenin
  • Z29.13 - Encounter for prophylactic Rho(D) immune globulin
  • Z29.14 - Encounter for prophylactic rabies immune globin

Code Classification
  • Factors influencing health status and contact with health services (Z00–Z99)
    • Persons with potential health hazards related to communicable diseases (Z20-Z29)
      • Encounter for immunization (Z23)

Information for Medical Professionals

Code Edits
The following edits are applicable to this code:
Unacceptable principal diagnosis Additional informationCallout TooltipUnacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual’s health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

Present on Admission (POA) Additional informationCallout TooltipPresent on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

The code Z23 is exempt from POA reporting.

  • First Haemophilus influenzae type B and diphtheria, tetanus and pertussis vaccine given
  • Measles vaccination requested
  • Measles, mumps and rubella vaccination given
  • Medication requested
  • Meningococcus vaccination given
  • Second Haemophilus influenzae type B and diphtheria, tetanus and pertussis vaccine given
  • Third Hemophilus influenzae type B and diphtheria, tetanus and pertussis vaccine given
  • Travel vaccination given
  • Vaccination given

Index of Diseases and Injuries
References found for the code Z23 in the Index of Diseases and Injuries:

Information for Patients


Also called: Vaccination

Shots may hurt a little, but the diseases they can prevent are a lot worse. Some are even life-threatening. Immunization shots, or vaccinations, are essential. They protect against things like measles, mumps, rubella, hepatitis B, polio, tetanus, diphtheria, and pertussis (whooping cough). Immunizations are important for adults as well as children.

Your immune system helps your body fight germs by producing substances to combat them. Once it does, the immune system "remembers" the germ and can fight it again. Vaccines contain germs that have been killed or weakened. When given to a healthy person, the vaccine triggers the immune system to respond and thus build immunity.

Before vaccines, people became immune only by actually getting a disease and surviving it. Immunizations are an easier and less risky way to become immune.

NIH: National Institute of Allergy and Infectious Diseases

  • Immunizations - diabetes (Medical Encyclopedia)

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