T75.830D: Gulf war illness, subsequent encounter

New code · FY2026

Billable: use this code on claims.

• New code, effective October 1, 2025 (FY2026).

Code breakdown

Coding notes

Inclusion terms (from T75.830)

• Gulf war syndrome

Use additional code (from T75.83)

• code to identify associated manifestations

Excludes1 (from T75)

• adverse effects NEC (T78.-)

Excludes2 (from T75)

• burns (electric) (T20-T31)

7th character (from T75)

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

7th characters (category T75)

• A initial encounter
• D subsequent encounter
• S sequela

Medicare coverage

T75.830D is listed as a covered diagnosis in 1 Medicare billing and coding article:

• A56612 Billing and Coding: CT of the Head

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All FY2026 ICD-10-CM changes

ICD-10-CM codes and descriptions are from the CMS and NCHS code files. Coverage is from the CMS Medicare Coverage Database billing and coding articles.