Gulf war illness, subsequent encounter

ValidICD-10-CM diagnosis code.

Valid for claims with a date of service in the current code year.

Valid FY2026 onwards.

What has happened to this code

Every change the publisher made, from 2026 to now.

FY2026 Added to the code set Gulf war illness, subsequent encounter

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from T75 Other and unspecified effects of other external causes

Seventh character required

The appropriate 7th character is to be added to each code from category T75

Excludes1 - never coded here

adverse effects NEC (T78.-)

Excludes2 - not included here

burns (electric) (T20-T31)

Inherited from the T66-T78 section Other and unspecified effects of external causes (T66-T78)

Code also

, if applicable, place of occurrence, such as:
highway rest stop (Y92.523)
school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
service areas as the place of occurrence of the external cause (Y92.52-)
single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
transport vehicle as the place of occurrence of the external cause (Y92.81-)

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Illness > Gulf war
Syndrome > Gulf war

Codes in the same group

Code	Description	Status
T75.830A	Gulf war illness, initial encounter	Valid
T75.830S	Gulf war illness, sequela	Valid