Z28.31
Header — not billableUnderimmunization for COVID-19 status
The ICD-10 code for underimmunization for covid-19 status is Z28.31.
Z28.31 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 2 more specific codes below.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under Z28.31
Related codes in this category
- Z28.39Other underimmunization status
- Z28.31Underimmunization for COVID-19 statusnon-billable header