Z28.3
Non-billableUnderimmunization status
Underimmunization status
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Includes
Conditions included under this code
- vaccination not carried out
Use Additional Code
Additional codes that should follow this code
- code, if applicable, to identify:
- •immunization not carried out because of contraindicationZ28.0
- •immunization not carried out because of patient decision for other and unspecified reasonZ28.2
- •immunization not carried out because of patient decision for reasons of belief or group pressureZ28.1
- •immunization not carried out for other reasonZ28.8
Code Also
A second code may be required; sequencing depends on circumstances
Child Codes (2)
Related Codes(5)
Z28.0Immunization not carried out because of contraindication
Z28.1Immuniz not crd out because of patient belief/grp pressr
Z28.2Immuniz not crd out bec pt decision for oth and unsp reason
Z28.8Immunization not carried out for other reason
Z28.9Immunization not carried out for unspecified reason
Also Known As / Clinical Terms(1)
Frequently Asked Questions
What is the ICD-10 code for underimmunization status?
The ICD-10-CM code for underimmunization status is Z28.3. The full clinical description is "Underimmunization status". Z28.3 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code Z28.3 mean?
ICD-10-CM code Z28.3 represents “Underimmunization status”. It is classified under Chapter 22: Factors Influencing Health Status and Contact With Health Services and is a non-billable header code. Use a more specific child code for billing purposes.
Is Z28.3 a billable code?
No, Z28.3 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 2 child codes under Z28.3.
What chapter is Z28.3 in?
Z28.3 is in Chapter 22: Factors Influencing Health Status and Contact With Health Services (codes Z00-Z99).
What are the subcategories under Z28.3?
Z28.3 has 2 child codes, including: Z28.31 (Underimmunization for COVID-19 status), Z28.39 (Other underimmunization status).
Are additional codes required with Z28.3?
Yes, when using Z28.3, also report: 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-).
What are the UMLS CUIs for Z28.3?
Z28.3 is linked to 1 UMLS Concept Unique Identifier: C2712541. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does Z28.3 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like underimmunization status affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of Z28.3?
There is no direct ICD-11 mapping available for Z28.3 in the WHO crosswalk tables. This may mean the concept is classified differently in ICD-11. Use the ICD-10 to ICD-11 converter to search for related codes.
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.