Z28.310
✓ Billable
Unvaccinated for COVID-19
ICD-10-CM · FY2026 · Factors Influencing Health Status
Code
Z28.310
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Factors Influencing Health Status
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code Z28.310?
ICD-10-CM code Z28.310 represents Unvaccinated for COVID-19. It is a billable diagnosis code in the Factors Influencing Health Status chapter, effective October 1, 2025 – September 30, 2026.
Is Z28.310 billable?
Yes. Z28.310 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is Z28.310 in?
Z28.310 belongs to the Factors Influencing Health Status chapter (Z00–Z99) of ICD-10-CM.
Related codes in the Z28 category
Z28
Immunization not carried out and underimmunization status
Non-billable
Z28.0
Immunization not carried out because of contraindication
Non-billable
Z28.1
Immunization not carried out because of patient decision for reasons of belief or group pressure
Billable
Z28.2
Immunization not carried out because of patient decision for other and unspecified reason
Non-billable
Z28.3
Underimmunization status
Non-billable
Z28.8
Immunization not carried out for other reason
Non-billable
Z28.9
Immunization not carried out for unspecified reason
Billable
Z28.01
Immunization not carried out because of acute illness of patient
Billable
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