ICD-10-CM 2027
ICD-10 code for benzene contact
From the official ICD-10-CM alphabetic index entry “Contact (with) › benzene”. Page updated September 29, 2026.
About coding benzene contact
The ICD-10-CM code for benzene contact is Z77.021 (Contact with and (suspected) exposure to benzene).
Within Z77.02 (contact with and (suspected) exposure to hazardous aromatic compounds), Z77.021 is specifically for contact with and (suspected) exposure to benzene. Related codes cover aromatic amines (Z77.020) and other hazardous aromatic compounds (Z77.028).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about benzene contact ICD-10 codes
What is the ICD-10 code for benzene contact?
- Z77.021 — Contact with and (suspected) exposure to benzene.
Is Z77.021 billable?
- Yes. Z77.021 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z77.021 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z77.021 a CC or MCC?
- No. Z77.021 is neither a CC nor an MCC under MS-DRG v44.0.