| T75.81 | Effects of abnormal gravitation [G] forces | NON-BILLABLE CODE |
| T75.81XA | Effects of abnormal gravitation [G] forces, initial encounter | BILLABLE CODE |
| T75.81XD | Effects of abnormal gravitation [G] forces, subsequent encounter | BILLABLE CODE |
| T75.81XS | Effects of abnormal gravitation [G] forces, sequela | BILLABLE CODE |
| T75.82 | Effects of weightlessness | NON-BILLABLE CODE |
| T75.82XA | Effects of weightlessness, initial encounter | BILLABLE CODE |
| T75.82XD | Effects of weightlessness, subsequent encounter | BILLABLE CODE |
| T75.82XS | Effects of weightlessness, sequela | BILLABLE CODE |
| T75.83 | Effects of war theater | NON-BILLABLE CODE |
| T75.830 | Gulf war illness | NON-BILLABLE CODE |
| T75.830A | Gulf war illness, initial encounter | BILLABLE CODE |
| T75.830D | Gulf war illness, subsequent encounter | BILLABLE CODE |
| T75.830S | Gulf war illness, sequela | BILLABLE CODE |
| T75.838 | Effects of other war theater | NON-BILLABLE CODE |
| T75.838A | Effects of other war theater, initial encounter | BILLABLE CODE |
| T75.838D | Effects of other war theater, subsequent encounter | BILLABLE CODE |
| T75.838S | Effects of other war theater, sequela | BILLABLE CODE |
| T75.89 | Other specified effects of external causes | NON-BILLABLE CODE |
| T75.89XA | Other specified effects of external causes, initial encounter | BILLABLE CODE |
| T75.89XD | Other specified effects of external causes, subsequent encounter | BILLABLE CODE |
| T75.89XS | Other specified effects of external causes, sequela | BILLABLE CODE |
