2026 ICD-10-CM Diagnosis Code T75.830SGulf war illness, sequela
T75.830S is a billable ICD-10-CM diagnosis code for gulf war illness, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 922 through 923. The code is exempt from POA reporting.
Code Identity
Code Classification
Present on Admission (POA)Billing
T75.830S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Other and unspecified effects of other external causes (T75). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Code History & ChangesHistory
New Code T75.830S was added to the ICD-10-CM code set for FY 2026, effective October 1, 2025.
Replacement T75.830S replaces the following previously assigned code(s):
- T75.89XS - Other specified effects of external causes, sequela
Questions About T75.830SOverview
Is T75.830S (Gulf war illness) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report gulf war illness, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in T75.830S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the gulf war illness itself has resolved, not the original event.
What MS-DRG does T75.830S group to?
When gulf war illness, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, with relative weights from 1.0177 to 1.7494 depending on complications. Higher weights mean higher Medicare reimbursement.
Is T75.830S exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for gulf war illness, sequela on inpatient claims.
