Z77.3UpcomingCategory · further specificity required

Contact with and (suspected) exposure to war theater

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

Z77.31Contact with and (suspected) exposure to Gulf War theater Z77.32Contact with and (suspected) exposure to burn pits in war theater Z77.33Contact with and (suspected) exposure to Agent Orange Z77.39Contact with and (suspected) exposure to other war theater

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 · 2025-10-01

Code history

Latest recorded change · FY2026

ChangedUnchanged

FY2026

Effective from 2025-10-01

Added

Contact with and (suspected) exposure to war theater

Category — select a more specific code

CDC/NCHS · FY2026

All editions (3)

All editions	Effective from	Code history
FY2026	2025-10-01	Added
FY2026 · April	2026-04-01	No tabular change
FY2027	2026-10-01	No tabular change

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

Z77.31Contact with and (suspected) exposure to Gulf War theaterBillable / specific Z77.32Contact with and (suspected) exposure to burn pits in war theaterBillable / specific Z77.33Contact with and (suspected) exposure to Agent OrangeBillable / specific Z77.39Contact with and (suspected) exposure to other war theaterBillable / 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
Z77.4	Contact with and (suspected) exposure to blast overpressure	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 ↗

Z77.3UpcomingCategory · further specificity required

Contact with and (suspected) exposure to war theater

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 · 2025-10-01

Code history

Latest recorded change · FY2026

ChangedUnchanged

FY2026

Effective from 2025-10-01

Added

Contact with and (suspected) exposure to war theater

Category — select a more specific code

CDC/NCHS · FY2026

All editions (3)

All editions	Effective from	Code history
FY2026	2025-10-01	Added
FY2026 · April	2026-04-01	No tabular change
FY2027	2026-10-01	No tabular change

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