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ICD-10-CM 2027 diagnosis code

T75.830Gulf war illness

Not billable — use a more specific codeRequires 7th character

T75.830 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.

Code last changed in FY2026 (effective October 1, 2025). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T75.830

T75.830 is the ICD-10-CM diagnosis code for Gulf war illness. It belongs to category T75 (other and unspecified effects of other external causes), block T66-T78 (other and unspecified effects of external causes) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within T75.83 (effects of war theater), T75.830 is specifically for Gulf war illness. Related codes cover effects of other war theater (T75.838).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It was added in FY2026, effective October 1, 2025.

7th character

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

Coding notes

Applicable toConditions and synonyms classified to this code
  • Gulf war syndrome

Notes that apply from higher levels

Instructions written at a parent level also apply to T75.830.

› From T75.83 Effects of war theater
Use additional code
  • code to identify associated manifestations
› From T75 Other and unspecified effects of other external causes
Excludes1
  • adverse effects NEC (T78.-)
Excludes2

Broader instructions also apply from T66-T78 Other and unspecified effects of external causes and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to T75.830.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2026 (effective 10/1/2025): Added
  • No changes since FY2026.

Common questions about T75.830

Is T75.830 billable?

No. T75.830 is a header code. Report one of its more specific subcodes instead.