ICD-10-CM 2027
ICD-10 code for agent Orange exposure
From the official ICD-10-CM alphabetic index entry “Exposure (to) › Agent Orange”. Page updated September 29, 2026.
About coding agent Orange exposure
The ICD-10-CM code for agent Orange exposure is Z77.33 (Contact with and (suspected) exposure to Agent Orange).
Within Z77.3 (contact with and (suspected) exposure to war theater), Z77.33 is specifically for contact with and (suspected) exposure to Agent Orange. Related codes cover Gulf War theater (Z77.31), burn pits in war theater (Z77.32) and other war theater (Z77.39).
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 agent Orange exposure ICD-10 codes
What is the ICD-10 code for agent Orange exposure?
- Z77.33 — Contact with and (suspected) exposure to Agent Orange.
Is Z77.33 billable?
- Yes. Z77.33 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z77.33 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 Z77.33 a CC or MCC?
- No. Z77.33 is neither a CC nor an MCC under MS-DRG v44.0.