2026 ICD-10-CM Diagnosis Code Z77.29Contact with and (suspected) exposure to other hazardous substances

ICD-10-CM Codes›Z00–Z99›Z77-Z99›suspected

ICD-10-CM Z77.29
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z77.29 is a billable ICD-10-CM diagnosis code for contact with and (suspected) exposure to other hazardous substances. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified status.

Code Identity

ICD-10-CM Code
Z77.29
Billable Status
Yes — Valid for Submission
Code Describes
Contact with and (suspected) exposure to other hazardous substances
Short Description
Contact with and exposure to other hazardous substances
Parent Code
Z77.2
Contact with and (suspected) exposure to other hazardous substances

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ77-Z99Persons with potential health hazards related to family and personal history and certain conditions influencing health status
CategorysuspectedOther contact with and exposures hazardous to health (Z77)
This CodeZ77.29Contact with and (suspected) exposure to other hazardous substances

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z77.29.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Accidental exposure to bleach
  • Accidental exposure to carbon monoxide
  • Accidental exposure to carbon monoxide from domestic gas fire or heater
  • Accidental exposure to cleaning agent
  • Accidental exposure to exhaust gas from motor vehicle in motion
  • Accidental exposure to exhaust gas in aircraft
  • Accidental exposure to organophosphorus herbicide
  • Accidental exposure to urea herbicide
  • Accidental ingestion of ergot
  • Accidental ingestion of food contaminant
  • Environment contains radiological material hazards
  • Environment contains traffic hazards
  • Environment contains vehicle hazards
  • Exposure to Agent Orange
  • Exposure to angiotensin converting enzyme inhibitor agent
  • Exposure to anticonvulsant
  • Exposure to anti-folic acid drug
  • Exposure to dexfenfluramine
  • Exposure to diethylstilbestrol
  • Exposure to drug or medicament
  • Exposure to fenfluramine
  • Exposure to gaseous substance
  • Exposure to iodine
  • Exposure to methamphetamine
  • Exposure to potentially hazardous substance
  • Exposure to toxin
  • History of suspected exposure to biological agent
  • Inhalation of substance
  • Soot in oropharynx
  • Vaping

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Contact(with)
      • hazardous substances NEC
    • Exposure(to)
      • hazardous substances NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC025
Other specified status
Default principal diagnosis: inpatient No · outpatient Yes

Clinical InformationClinical

  • 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.

  • Vaping

    inhaling of vapors produced by electronic nicotine delivery systems such as e-cigarettes.

Convert Z77.29 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V87.39 Cont/exp hazard sub NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z77.29Overview

Is Z77.29 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report contact with and (suspected) exposure to other hazardous substances on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can Z77.29 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because contact with and (suspected) exposure to other hazardous substances describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

What is the ICD-9 equivalent of Z77.29?

Under the General Equivalence Mappings, contact with and (suspected) exposure to other hazardous substances converts to ICD-9-CM V87.39 (cont/exp hazard sub NEC). The mapping is approximate, so confirm the match fits the documentation.