Is Z28.31 a billable ICD-10-CM code?

No. Z28.31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does Z28.31 sit in the tabular list?

Factors influencing health status and contact with health services (Z00-Z99), in the block Persons with potential health hazards related to communicable diseases (Z20-Z29).

Z28.31

Z28.31 — Underimmunization for COVID-19 status

Non-billable headerICD-10-CM

Z28.31 is a non-billable header ICD-10-CM code for underimmunization for covid-19 status. It cannot be billed on its own: choose one of the more specific child codes below.

Notes

Additional guidance from the ICD-10-CM tabular list.

These codes should not be used for individuals who are not eligible for the COVID-19 vaccines, as determined by the healthcare provider.

Risk adjustment

Z28.31 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead Z28.31

2 child codes. Green means billable.

Related codes at this level

Codes that share Z28.3. If Z28.31 is not quite right, the correct code is usually one of these.

Z28.39Other underimmunization status

Questions about Z28.31

Is Z28.31 a billable ICD-10-CM code?: No. Z28.31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does Z28.31 sit in the tabular list?: Factors influencing health status and contact with health services (Z00-Z99), in the block Persons with potential health hazards related to communicable diseases (Z20-Z29).