2023

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  2. Z00-Z99
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  5. 2023 ICD-10-CM Diagnosis Code Z28.9

2023 ICD-10-CM Diagnosis Code Z28.9

Immunization not carried out for unspecified reason

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code POA Exempt
  • Z28.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2023 edition of ICD-10-CM Z28.9 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of Z28.9 - other international versions of ICD-10 Z28.9 may differ.
The following code(s) above Z28.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to Z28.9:
  • Z00-Z99
    2023 ICD-10-CM Range Z00-Z99

    Factors influencing health status and contact with health services

    Note
    • Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. 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 (immunization), 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.
    Factors influencing health status and contact with health services
  • Z28
    ICD-10-CM Diagnosis Code Z28

    Immunization not carried out and underimmunization status

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    Code Also
    • , if applicable, encounter for immunization safety counseling (Z71.85)
    Includes
    • vaccination not carried out
    Immunization not carried out and underimmunization status
Approximate Synonyms
  • Vaccination not carried out
  • Vaccination not done
Present On Admission
POA Help
"Present On Admission" is defined as present at the time the order for inpatient admission occurs — conditions that develop during an outpatient encounter, including emergency department, observation, or outpatient surgery, are considered POA.
  • Z28.9 is considered exempt from POA reporting.
ICD-10-CM Z28.9 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
  • 795 Normal newborn
  • 951 Other factors influencing health status

Convert Z28.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change

Diagnosis Index entries containing back-references to Z28.9:

ICD-10-CM Codes Adjacent To Z28.9
Z28.3 Underimmunization status
Z28.31 Underimmunization for COVID-19 status
Z28.310 Unvaccinated for COVID-19
Z28.311 Partially vaccinated for COVID-19
Z28.39 Other underimmunization status
Z28.8 Immunization not carried out for other reason
Z28.81 Immunization not carried out due to patient having had the disease
Z28.82 Immunization not carried out because of caregiver refusal
Z28.83 Immunization not carried out due to unavailability of vaccine
Z28.89 Immunization not carried out for other reason
Z28.9 Immunization not carried out for unspecified reason
Z29 Encounter for other prophylactic measures
Z29.1 Encounter for prophylactic immunotherapy
Z29.11 …… for respiratory 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
Z29.3 Encounter for prophylactic fluoride administration
Z29.8 Encounter for other specified prophylactic measures
Z29.9 Encounter for prophylactic measures, unspecified
Z30 Encounter for contraceptive management

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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