Is Z04 a billable ICD-10-CM code?

No. Z04 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does Z04 sit in the tabular list?

Factors influencing health status and contact with health services (Z00-Z99), in the block Persons encountering health services for examinations (Z00-Z13).

Z04

Z04 — Encounter for examination and observation for other reasons

Non-billable headerICD-10-CM

Z04 is a non-billable header ICD-10-CM code for encounter for examination and observation for other reasons. It cannot be billed on its own: choose one of the more specific child codes below.

Includes

Conditions this code covers.

encounter for examination for medicolegal reasons
This category is to be used when a person without a diagnosis is suspected of having an abnormal condition, without signs or symptoms, which requires study, but after examination and observation, is ruled-out. This category is also for use for administrative and legal observation status.

Other codes that can never be billed with Z04

These codes carry an Excludes1 note pointing at Z04. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Z04 alone.

T76.2Sexual abuse, suspected
T76Adult and child abuse, neglect and other maltreatment, suspected
Z04.1Encounter for examination and observation following transport accident
Z04.71Encounter for examination and observation following alleged adult physical abuse
Z04.72Encounter for examination and observation following alleged child physical abuse

Risk adjustment

Z04 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 Z04

8 child codes. Green means billable.

Questions about Z04

Is Z04 a billable ICD-10-CM code?: No. Z04 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does Z04 sit in the tabular list?: Factors influencing health status and contact with health services (Z00-Z99), in the block Persons encountering health services for examinations (Z00-Z13).