ICD-10-CM Codes
Z00-Z99
Z20-Z29
Z28-
2023 ICD-10-CM Diagnosis Code Z28.31

2023 ICD-10-CM Diagnosis Code Z28.31

Underimmunization for COVID-19 status

2016

2017

2018

2019

2020

2021

2022

2023

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.
The 2023 edition of ICD-10-CM Z28.31 became effective on October 1, 2022.
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
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
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
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

2016 (effective 10/1/2015): No change
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 Z28.31:

Delinquent immunization status Z28.39
ICD-10-CM Diagnosis Code Z28.39
Other underimmunization status
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
  2016 2017 2018 2019 2020 2021 2022 2023 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
  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code POA Exempt
  Applicable To
  Delinquent immunization status
  Lapsed immunization schedule status
  - COVID-19 Z28.31-
Underimmunization status Z28.39
ICD-10-CM Diagnosis Code Z28.39
Other underimmunization status
Applicable To
Delinquent immunization status
Lapsed immunization schedule status
- COVID-19 Z28.31-

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.

2023 ICD-10-CM Diagnosis Code Z28.31

Underimmunization for COVID-19 status

Factors influencing health status and contact with health services

Immunization not carried out and underimmunization status

Underimmunization status

Other underimmunization status

Other underimmunization status

Other underimmunization status

Other underimmunization status