T75.830D — Gulf war illness, subsequent encounter
T75.830D is a billable, specific ICD-10-CM code for gulf war illness, subsequent encounter. It is valid for submission on a claim.
7th character "D" — subsequent encounter
The appropriate 7th character is to be added to each code from category T75
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Gulf war syndrome
Risk adjustment
T75.830D does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
T75.830D is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56612Billing and Coding: CT of the Head
Code history
What changed, and when. Derived by diffing consecutive CMS release files — which matters when you are defending a code assigned under an earlier edition.
- addedFY2024-FY2026
Gulf war illness, subsequent encounter
Related codes at this level
Codes that share T75.830. If T75.830D is not quite right, the correct code is usually one of these.
Questions about T75.830D
- Is T75.830D a billable ICD-10-CM code?
- Yes. T75.830D is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T75.830D sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Other and unspecified effects of external causes (T66-T78).