ICD-10-CM Z28.310 is the diagnosis code for Unvaccinated for COVID-19. This code falls under the section "Persons with potential health hazards related to communicable diseases" within Chapter 21 — Factors influencing health status and contact with health services (Z00-Z99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where Z28.310 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, Z28.310 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Z28.310 is the ICD-10-CM diagnosis code for "Unvaccinated for COVID-19". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of Z28.310 is Z28.31 ("Underimmunization for COVID-19 status"). Z28.310 provides a more specific classification within this category.
Z28.310 is located in Section Z20-Z29 — "Persons with potential health hazards related to communicable diseases" within Chapter 21 of the ICD-10-CM Tabular List.
Use Z28.310 when the patients documented diagnosis matches "Unvaccinated for COVID-19" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Unvaccinated for COVID-19 is Z28.310.
Yes, Z28.310 can be used as a primary diagnosis code since it is billable and specific.
Z28.310 is in Chapter 21 of the ICD-10-CM Tabular List.
Yes, Z28.310 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.