Is Z40 a billable ICD-10-CM code?

No. Z40 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does Z40 sit in the tabular list?

Factors influencing health status and contact with health services (Z00-Z99), in the block Encounters for other specific health care (Z40-Z53).

What cannot be coded together with Z40?

Z40 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

Z40

Z40 — Encounter for prophylactic surgery

Non-billable headerICD-10-CM

Z40 is a non-billable header ICD-10-CM code for encounter for prophylactic surgery. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

organ donations (Z52.-)
therapeutic organ removal-code to condition

Other codes that can never be billed with Z40

These codes carry an Excludes1 note pointing at Z40. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Z40 alone.

Z29Encounter for other prophylactic measures

Risk adjustment

Z40 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 Z40

3 child codes. Green means billable.

Questions about Z40

Is Z40 a billable ICD-10-CM code?: No. Z40 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does Z40 sit in the tabular list?: Factors influencing health status and contact with health services (Z00-Z99), in the block Encounters for other specific health care (Z40-Z53).
What cannot be coded together with Z40?: Z40 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.