2026 ICD-10-CM Diagnosis Code Z77.028Contact with and (suspected) exposure to other hazardous aromatic compounds

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

ICD-10-CM Z77.028
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z77.028 is a billable ICD-10-CM diagnosis code for contact with and (suspected) exposure to other hazardous aromatic compounds. 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. Coders also document this condition as exposure to ethylbenzene. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified status.

Code Identity

ICD-10-CM Code
Z77.028
Billable Status
Yes — Valid for Submission
Code Describes
Contact with and (suspected) exposure to other hazardous aromatic compounds
Short Description
Contact w and exposure to oth hazardous aromatic compounds
Parent Code
Z77.02
Contact with and (suspected) exposure to hazardous aromatic compounds

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 CodeZ77.028Contact with and (suspected) exposure to other hazardous aromatic compounds

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z77.028.

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.

  • Exposure to ethylbenzene
  • Exposure to indene
  • Exposure to naphthalene
  • Exposure to toluene
  • Exposure to xylene

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Aromatic dyes NOS
  • Polycyclic aromatic hydrocarbons

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)
      • aromatic (hazardous) compounds NEC
    • Contact(with)
      • aromatic dyes NOS
    • Contact(with)
      • polycyclic aromatic hydrocarbons
    • Exposure(to)
      • aromatic (hazardous) compounds NEC
    • Exposure(to)
      • aromatic dyes NOS
    • Exposure(to)
      • polycyclic aromatic hydrocarbons

Clinical ClassificationClinical

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

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

Patient EducationClinical

Poisoning

A poison is any substance that is harmful to your body. You might swallow it, inhale it, inject it, or absorb it through your skin. Any substance can be poisonous if too much is taken. Poisons can include:

Read the full article at MedlinePlus

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Convert Z77.028 to ICD-9-CMHistory

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

ICD-9-CM
V87.19 Cont/exp haz aromat 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 Z77.028Overview

Is Z77.028 a billable code?

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

Can Z77.028 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 aromatic compounds 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 Z77.028?

Under the General Equivalence Mappings, contact with and (suspected) exposure to other hazardous aromatic compounds converts to ICD-9-CM V87.19 (cont/exp haz aromat NEC). The mapping is approximate, so confirm the match fits the documentation.