Is Z28.31 a billable code?
No. Z28.31 is a header code that groups 2 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
Z28.31: Underimmunization for COVID-19 status
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
Z28.31 groups related diagnoses under underimmunization for covid-19 status. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under Z28.31
Other codes in Z28.3 Underimmunization status
Z28.31 questions
What does Z28.31 mean?
Z28.31 is the ICD-10-CM code for Underimmunization for COVID-19 status. It is in chapter 22, Factors influencing health status and contact with health services (Z00-Z99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.