Z77.12
Contact with and (suspected) exposure to hazards in the physical environment
Z77.12 is a non-billable ICD-10-CM code header for contact with and (suspected) exposure to hazards in the physical environment. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are 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 and 1 more. Its coding notes include a Code also instruction and 7 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Contact and exposure codes can be first-listed to explain an encounter for testing, or more commonly are secondary codes identifying a potential risk.
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
Also from chapter/block level (1 note)
- any follow-up examination (Z08-Z09)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
- 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)
Includes
Further defines or gives examples of the content of the category.
- contact with and (suspected) exposures to potential hazards to health
Notes
Also from chapter/block level (3 notes)
- 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.
More specific codes under Z77.12 5
- Z77.120Contact with and (suspected) exposure to mold (toxic)Billable
- Z77.121Contact with and (suspected) exposure to harmful algae and algae toxinsBillable
- Z77.122Contact with and (suspected) exposure to noiseBillable
- Z77.123Contact with and (suspected) exposure to radon and other naturally occurring radiationBillable
- Z77.128Contact with and (suspected) exposure to other hazards in the physical environmentBillable