2022 ICD-10-CM Diagnosis Code Z28.31

Underimmunization for COVID-19 status

    2022 - New Code Non-Billable/Non-Specific Code
  • Z28.31 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • ICD-10-CM Z28.31 is a new 2022 ICD-10-CM code that became effective on October 1, 2021.
  • This is the American ICD-10-CM version of Z28.31 - other international versions of ICD-10 Z28.31 may differ.
Note
  • These codes should not be used for individuals who are not eligible for the COVID-19 vaccines, as determined by the healthcare provider.
The following code(s) above Z28.31 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 Z28.31:
  • Z00-Z99
    2022 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 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
  • Z28.3
    ICD-10-CM Diagnosis Code Z28.3

    Underimmunization status

      2016 2017 2018 2019 2020 2021 2022 - Converted to Parent Code Non-Billable/Non-Specific Code
    Use Additional
    • code, if applicable, to identify:
    • immunization not carried out because of contraindication (Z28.0-)
    • immunization not carried out because of patient decision for other and unspecified reason (Z28.2-)
    • immunization not carried out because of patient decision for reasons of belief or group pressure (Z28.1)
    • immunization not carried out for other reason (Z28.8-)
    Underimmunization status
Code History
  • 2022 (effective 10/1/2021): New code

Diagnosis Index entries containing back-references to Z28.31:
  • Delinquent immunization status Z28.39
    ICD-10-CM Diagnosis Code Z28.39

    Other underimmunization status

      2022 - New Code Billable/Specific Code POA Exempt
    Applicable To
    • Delinquent immunization status
    • Lapsed immunization schedule status
    • COVID-19 Z28.31-
  • Status (post) - see also Presence (of)
    • delinquent immunization Z28.39
      ICD-10-CM Diagnosis Code Z28.39

      Other underimmunization status

        2022 - New Code Billable/Specific Code POA Exempt
      Applicable To
      • Delinquent immunization status
      • Lapsed immunization schedule status
      • COVID-19 Z28.31-
    • underimmunization Z28.39
      ICD-10-CM Diagnosis Code Z28.39

      Other underimmunization status

        2022 - New Code Billable/Specific Code POA Exempt
      Applicable To
      • Delinquent immunization status
      • Lapsed immunization schedule status
  • Underimmunization status Z28.39
    ICD-10-CM Diagnosis Code Z28.39

    Other underimmunization status

      2022 - New Code Billable/Specific Code POA Exempt
    Applicable To
    • Delinquent immunization status
    • Lapsed immunization schedule status

ICD-10-CM Codes Adjacent To Z28.31
Z28.02 Immunization not carried out because of chronic illness or condition of patient
Z28.03 Immunization not carried out because of immune compromised state of patient
Z28.04 Immunization not carried out because of patient allergy to vaccine or component
Z28.09 Immunization not carried out because of other contraindication
Z28.1 Immunization not carried out because of patient decision for reasons of belief or group pressure
Z28.2 Immunization not carried out because of patient decision for other and unspecified reason
Z28.20 Immunization not carried out because of patient decision for unspecified reason
Z28.21 Immunization not carried out because of patient refusal
Z28.29 Immunization not carried out because of patient decision for other reason
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

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