Is Z28.310 a billable ICD-10-CM code?

Yes. Z28.310 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does Z28.310 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).

Z28.310

Z28.310 — Unvaccinated for COVID-19

Billable / specific codeICD-10-CMPOA exempt

Z28.310 is a billable, specific ICD-10-CM code for unvaccinated for covid-19. It is valid for submission on a claim.

Risk adjustment

Z28.310 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.

How Z28.310 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Z28.310.

COVID-19›unvaccinated(for)
Unimmunized›for COVID-19
Unvaccinated›for COVID-19
Underimmunization status›COVID-19›unvaccinated(for)
Status›underimmunization›COVID-19›unvaccinated(for)

Related codes at this level

Codes that share Z28.31. If Z28.310 is not quite right, the correct code is usually one of these.

Z28.311Partially vaccinated for COVID-19

Questions about Z28.310

Is Z28.310 a billable ICD-10-CM code?: Yes. Z28.310 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Z28.310 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).