T75.830 – Gulf war illness

ICD-10-CM 2027 diagnosis code · Other and unspecified effects of external causes

Non-billable header

ICD-10-CM code T75.830

Code: T75.830 (claims format: T75830)
Description: Gulf war illness
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
Block: T66-T78 Other and unspecified effects of external causes
Parent codes: T75 › T75.8 › T75.83

Billable codes under T75.830

T75.830 is a header code and cannot be used on claims. Choose the most specific code:

T75.830A – Gulf war illness, initial encounterBillable
T75.830D – Gulf war illness, subsequent encounterBillable
T75.830S – Gulf war illness, sequelaBillable

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes for T75.830

Applicable to:

Gulf war syndrome

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

T75 – Other and unspecified effects of other external causes

Excludes1 (not coded here):

adverse effects NEC (T78.-)

Excludes2 (not included here):

burns (electric) (T20-T31)

7th character note:

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

T75.83 – Effects of war theater

Use additional code:

code to identify associated manifestations

Block 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-)

Index terms for T75.830

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in T75.83

T75.838 – Effects of other war theaterHeader

Frequently asked questions

What is ICD-10 code T75.830?

T75.830 is the ICD-10-CM code for gulf war illness, in the block T66-T78 (Other and unspecified effects of external causes).

Is T75.830 a billable code?

No. T75.830 is a header code with more specific child codes; report one of the billable codes listed above.

What category does T75.830 belong to?

It belongs to category T75 – Other and unspecified effects of other external causes.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.