Z77.4UpcomingCategory · further specificity required

Contact with and (suspected) exposure to blast overpressure

Z77-Z99 · Inherited instructions

Code also

any follow-up examination (Z08-Z09)

Excludes 2 · 7

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

Excludes 2

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)

More specific codes

Z77.40Contact with and (suspected) exposure to unspecified blast overpressure Z77.41Contact with and (suspected) exposure to low-level blast overpressure Z77.42Contact with and (suspected) exposure to high-level blast overpressure Z77.49Contact with and (suspected) exposure to other blast overpressure

Claims & coverage

When ICD-10-CM is required

For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.

Use the service date for outpatient/professional claims and the discharge date for hospital inpatient claims. Earlier encounters use ICD-9-CM; each individual code must also be valid for the applicable date.

Official coding guidelines → · CMS ↗

First observed · 2026-10-01

Code history

Latest recorded change · FY2027

ChangedUnchanged

FY2027UpcomingSelected edition

Effective from 2026-10-01

Added

Contact with and (suspected) exposure to blast overpressure

Category — select a more specific code

CDC/NCHS · FY2027

All editions (1)

All editions	Effective from	Code history
FY2027	2026-10-01	Added

Code-level instructions

The official Tabular List has no additional instructions at this code level.

Review the instructions inherited from its parent categories below. Inherited instructions ↓

Review the official coding guidelines ↗

Inherited instructions

Chapters 21 · Factors influencing health status and contact with health services (Z00-Z99)

Note

Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
(a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
(b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

Z77-Z99 · Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)

Code also

any follow-up examination (Z08-Z09)

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

Includes

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

Excludes 2

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)

More specific codes

Z77.40Contact with and (suspected) exposure to unspecified blast overpressureBillable / specific Z77.41Contact with and (suspected) exposure to low-level blast overpressureBillable / specific Z77.42Contact with and (suspected) exposure to high-level blast overpressureBillable / specific Z77.49Contact with and (suspected) exposure to other blast overpressureBillable / specific

Related codes

Other entries in the same category; these are not automatic substitutes.

Code	Description	Category · further specificity required
Z77.0	Contact with and (suspected) exposure to hazardous, chiefly nonmedicinal, chemicals	Category · further specificity required
Z77.1	Contact with and (suspected) exposure to environmental pollution and hazards in the physical environment	Category · further specificity required
Z77.2	Contact with and (suspected) exposure to other hazardous substances	Category · further specificity required
Z77.3	Contact with and (suspected) exposure to war theater	Category · further specificity required
Z77.9	Other contact with and (suspected) exposures hazardous to health	Billable / specific

Official titles and instructions are preserved in their source language. Official sources ↗

Z77.4UpcomingCategory · further specificity required

Contact with and (suspected) exposure to blast overpressure

Z77-Z99 · Inherited instructions

Code also

any follow-up examination (Z08-Z09)

Excludes 2 · 7

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

Excludes 2

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)

More specific codes

Claims & coverage

When ICD-10-CM is required

For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.

Official coding guidelines → · CMS ↗

First observed · 2026-10-01

Code history

Latest recorded change · FY2027

ChangedUnchanged

FY2027UpcomingSelected edition

Effective from 2026-10-01

Added

Contact with and (suspected) exposure to blast overpressure

Category — select a more specific code

CDC/NCHS · FY2027

All editions (1)

All editions	Effective from	Code history
FY2027	2026-10-01	Added

Code-level instructions

The official Tabular List has no additional instructions at this code level.

Review the instructions inherited from its parent categories below. Inherited instructions ↓

Review the official coding guidelines ↗

Inherited instructions

Chapters 21 · Factors influencing health status and contact with health services (Z00-Z99)

Note

Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
(a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
(b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

Z77-Z99 · Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)

Code also

any follow-up examination (Z08-Z09)

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

Includes

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

Excludes 2

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)

More specific codes

Related codes

Other entries in the same category; these are not automatic substitutes.

Code	Description	Category · further specificity required
Z77.0	Contact with and (suspected) exposure to hazardous, chiefly nonmedicinal, chemicals	Category · further specificity required
Z77.1	Contact with and (suspected) exposure to environmental pollution and hazards in the physical environment	Category · further specificity required
Z77.2	Contact with and (suspected) exposure to other hazardous substances	Category · further specificity required
Z77.3	Contact with and (suspected) exposure to war theater	Category · further specificity required
Z77.9	Other contact with and (suspected) exposures hazardous to health	Billable / specific

Official titles and instructions are preserved in their source language. Official sources ↗