2026 ICD-10-CM Diagnosis Code Z77.021Contact with and (suspected) exposure to benzene

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

ICD-10-CM Z77.021
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z77.021 is a billable ICD-10-CM diagnosis code for contact with and (suspected) exposure to benzene. 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 aromatic amine. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified status.

Code Identity

ICD-10-CM Code
Z77.021
Billable Status
Yes — Valid for Submission
Code Describes
Contact with and (suspected) exposure to benzene
Short Description
Contact with and (suspected) exposure to benzene
Same as the full description in the CMS dataset.
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 CodeZ77.021Contact with and (suspected) exposure to benzene

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z77.021.

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 aromatic amine
  • Exposure to aromatic benzene

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)
      • benzene
    • Exposure(to)
      • benzene

Clinical ClassificationClinical

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

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

Convert Z77.021 to ICD-9-CMHistory

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

ICD-9-CM
V87.12 Contact/exposure benzene
Exact Match The mapping is direct, with no qualifiers.

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 Z77.021Overview

Is Z77.021 a billable code?

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

Can Z77.021 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because contact with and (suspected) exposure to benzene 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 Z77.021?

Under the General Equivalence Mappings, contact with and (suspected) exposure to benzene converts to ICD-9-CM V87.12 (contact/exposure benzene). The mapping is a direct match.