Is Z28 a billable ICD-10-CM code?

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

Where does Z28 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

Z28 — Immunization not carried out and underimmunization status

Non-billable headerICD-10-CM

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

Code also

Both codes may be needed to describe the encounter fully. Sequencing depends on the reason for the visit.

, if applicable, encounter for immunization safety counseling (Z71.85)

Includes

Conditions this code covers.

vaccination not carried out

Other codes that can never be billed with Z28

These codes carry an Excludes1 note pointing at Z28. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Z28 alone.

Z28.82Immunization not carried out because of caregiver refusal

Risk adjustment

Z28 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

6 child codes. Green means billable.

Questions about Z28

Is Z28 a billable ICD-10-CM code?: No. Z28 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does Z28 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).