Z77.4 — Contact with and (suspected) exposure to blast overpressure

Not billable

Is Z77.4 billable?

No — Z77.4 is a non-billable header code. Z77.4 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 4 billable codes beneath Z77.4.

Billable codes under this header

Z77.4 at a glance

Code	Z77.4
Description	Contact with and (suspected) exposure to blast overpressure
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Excludes2 — not included here — inherited from Z77

The conditions below are not part of Z77.4, but a patient may have both at the same time. When documentation supports it, Z77.4 and the excluded code may both be reported.

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)

Code also — inherited from Z77-Z99

Two codes may be needed to describe the condition fully. Whether Z77.4 is sequenced first depends on the reason for the encounter.

any follow-up examination (Z08-Z09)