Other contact with and (suspected) exposures hazardous to health (Z77) ICD-10-CM
The Z77 code range covers other contact with and (suspected) exposures hazardous to health with 34 ICD-10-CM diagnosis codes. 24 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- contact with and (suspected) exposures to potential hazards to health
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- 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
Codes in the Z77 Range 34 codes · 24 billable
- Z77 Other contact with and (suspected) exposures hazardous to healthNon-billable
- Z77.0 Contact with and (suspected) exposure to hazardous, chiefly nonmedicinal, chemicalsNon-billable
- Z77.01 Contact with and (suspected) exposure to hazardous metalsNon-billable
- Z77.010 Contact with and (suspected) exposure to arsenic
- Z77.011 Contact with and (suspected) exposure to lead
- Z77.012 Contact with and (suspected) exposure to uranium
- Z77.018 Contact with and (suspected) exposure to other hazardous metals
- Z77.02 Contact with and (suspected) exposure to hazardous aromatic compoundsNon-billable
- Z77.020 Contact with and (suspected) exposure to aromatic amines
- Z77.021 Contact with and (suspected) exposure to benzene
- Z77.028 Contact with and (suspected) exposure to other hazardous aromatic compounds
- Z77.09 Contact with and (suspected) exposure to other hazardous, chiefly nonmedicinal, chemicalsNon-billable
- Z77.090 Contact with and (suspected) exposure to asbestos
- Z77.098 Contact with and (suspected) exposure to other hazardous, chiefly nonmedicinal, chemicals
- Z77.1 Contact with and (suspected) exposure to environmental pollution and hazards in the physical environmentNon-billable
- Z77.11 Contact with and (suspected) exposure to environmental pollutionNon-billable
- Z77.110 Contact with and (suspected) exposure to air pollution
- Z77.111 Contact with and (suspected) exposure to water pollution
- Z77.112 Contact with and (suspected) exposure to soil pollution
- Z77.118 Contact with and (suspected) exposure to other environmental pollution
- Z77.12 Contact with and (suspected) exposure to hazards in the physical environmentNon-billable
- Z77.120 Contact with and (suspected) exposure to mold (toxic)
- Z77.121 Contact with and (suspected) exposure to harmful algae and algae toxins
- Z77.122 Contact with and (suspected) exposure to noise
- Z77.123 Contact with and (suspected) exposure to radon and other naturally occurring radiation
- Z77.128 Contact with and (suspected) exposure to other hazards in the physical environment
- Z77.2 Contact with and (suspected) exposure to other hazardous substancesNon-billable
- Z77.21 Contact with and (suspected) exposure to potentially hazardous body fluids
- Z77.22 Contact with and (suspected) exposure to environmental tobacco smoke (acute) (chronic)
- Z77.29 Contact with and (suspected) exposure to other hazardous substances
- Z77.3 Contact with and (suspected) exposure to war theaterNon-billable
- Z77.31 Contact with and (suspected) exposure to Gulf War theater New
- Z77.39 Contact with and (suspected) exposure to other war theater New
- Z77.9 Other contact with and (suspected) exposures hazardous to health
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the Z77 range.
Air Pollution
The presence of contaminants or pollutant substances in the air (AIR POLLUTANTS) that interfere with human health or welfare, or produce other harmful environmental effects. The substances may include GASES; PARTICULATE MATTER; or volatile ORGANIC CHEMICALS.
Air Pollution, Indoor
The contamination of indoor air.
Air Pollution, Radioactive
Contamination of air with radioactive substances.
Environmental Pollution
Contamination of the air, bodies of water, or land with substances that are harmful to human health and the environment.
Harmful Algal Bloom
An algal bloom where the algae produce powerful toxins that can kill fish, birds, and mammals, and ultimately cause illness in humans. The harmful bloom can also cause oxygen depletion in the water due to the death and decomposition of non-toxic algae species.
Lung Injury
Damage to any compartment of the lung caused by physical, chemical, or biological agents which characteristically elicit inflammatory reaction. These inflammatory reactions can either be acute and dominated by NEUTROPHILS, or chronic and dominated by LYMPHOCYTES and MACROPHAGES.
Retinal Dysplasia
Congenital, often bilateral, retinal abnormality characterized by the arrangement of outer nuclear retinal cells in a palisading or radiating pattern surrounding a central ocular space. This disorder is sometimes hereditary.
Tobacco Smoke Pollution
Contamination of the air by tobacco smoke.
Vaping
Inhaling of vapors produced by ELECTRONIC NICOTINE DELIVERY SYSTEMS such as E-CIGARETTES.
Water Pollution
Contamination of bodies of water (such as LAKES; RIVERS; SEAS; and GROUNDWATER.)
Water Pollution, Chemical
Adverse effect upon bodies of water (LAKES; RIVERS; seas; groundwater etc.) caused by CHEMICAL WATER POLLUTANTS.
Water Pollution, Radioactive
Contamination of water with radioactive materials and/or substances.
About the Z77 Code Range
The ICD-10 code Z77 series is used to document cases of contact with or suspected exposure to substances and environmental hazards that may be harmful to health. These codes help specify exposure types such as hazardous chemicals, metals, environmental pollution, and other physical or chemical dangers.
Codes under Z77 include detailed classifications like Z77.01 for hazardous metals exposure—covering substances such as arsenic (Z77.010), lead (Z77.011), uranium (Z77.012), and other metals like manganese or mercury (Z77.018). The section also highlights exposures to aromatic compounds like benzene (Z77.021) and toluene (Z77.028). Environmental pollution-related exposure codes range from air pollution (Z77.110), water pollution (Z77.111), to soil pollution (Z77.112), helping to track non-occupational exposures as well. Additionally, hazards such as mold (Z77.120), noise (Z77.122), and radon radiation (Z77.123) are covered. Other codes in this section address exposure to hazardous body fluids (Z77.21), secondhand tobacco smoke (Z77.22), and miscellaneous substances like bleach or herbicides (Z77.29). These specific codes support precise identification of exposures like "exposure to arsenic" or "exposure to lead," facilitating accurate medical documentation and assessment of health risks associated with environmental and chemical hazards.
Questions About This Page
How many billable codes are in the Z77 range?
Of the 34 codes in this range, 24 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the Z77 range classify?
The range classifies other contact with and (suspected) exposures hazardous to health. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
