ICD-10-CM 2027
ICD-10 code for war theater contact
Contact with and (suspected) exposure to Gulf War theater
From the official ICD-10-CM alphabetic index entry “Contact (with) › war theater (Gulf) (Persian Gulf)”. Page updated September 29, 2026.
About coding war theater contact
The ICD-10-CM code for war theater contact is Z77.31 (Contact with and (suspected) exposure to Gulf War theater). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on Z77.31.
Within Z77.3 (contact with and (suspected) exposure to war theater), Z77.31 is specifically for contact with and (suspected) exposure to Gulf War theater. Related codes cover burn pits in war theater (Z77.32), agent Orange (Z77.33) 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.
More specific war theater contact codes (official index)
Common questions about war theater contact ICD-10 codes
What is the ICD-10 code for war theater contact?
- Z77.31 — Contact with and (suspected) exposure to Gulf War theater. More specific codes apply when the documentation supports them: Z77.32, Z77.39.
What is the ICD-10 code for burn pits war theater contact?
- Z77.32 — Contact with and (suspected) exposure to burn pits in war theater.
Is Z77.31 billable?
- Yes. Z77.31 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z77.31 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 Z77.31 a CC or MCC?
- No. Z77.31 is neither a CC nor an MCC under MS-DRG v44.0.