Is Z77 a billable ICD-10-CM code?

No. Z77 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does Z77 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 family and personal history and certain conditions influencing health status (Z77-Z99).

Z77

Z77 — Other contact with and (suspected) exposures hazardous to health

Non-billable headerICD-10-CM

Z77 is a non-billable header ICD-10-CM code for other contact with and (suspected) exposures hazardous to health. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

contact with and (suspected) exposure to communicable diseases (Z20.-)
exposure to (parental) (environmental) tobacco smoke in the perinatal period (P96.81)
newborn affected by noxious substances transmitted via placenta or breast milk (P04.-)
occupational exposure to risk factors (Z57.-)
retained foreign body (Z18.-)
retained foreign body fully removed (Z87.821)
toxic effects of substances chiefly nonmedicinal as to source (T51-T65)

Includes

Conditions this code covers.

contact with and (suspected) exposures to potential hazards to health

Other codes that can never be billed with Z77

These codes carry an Excludes1 note pointing at Z77. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Z77 alone.

Z13.88Encounter for screening for disorder due to exposure to contaminants
X39.0Exposure to natural radiation
Z03Encounter for medical observation for suspected diseases and conditions ruled out
Z92.3Personal history of irradiation

Risk adjustment

Z77 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 Z77

5 child codes. Green means billable.

Questions about Z77

Is Z77 a billable ICD-10-CM code?: No. Z77 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does Z77 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 family and personal history and certain conditions influencing health status (Z77-Z99).