| W94.21 | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving | NON-BILLABLE CODE |
| W94.21XA | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, initial encounter | BILLABLE CODE |
| W94.21XD | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, subsequent encounter | BILLABLE CODE |
| W94.21XS | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, sequela | BILLABLE CODE |
| W94.22 | Exposure to reduction in atmospheric pressure while surfacing from underground | NON-BILLABLE CODE |
| W94.22XA | Exposure to reduction in atmospheric pressure while surfacing from underground, initial encounter | BILLABLE CODE |
| W94.22XD | Exposure to reduction in atmospheric pressure while surfacing from underground, subsequent encounter | BILLABLE CODE |
| W94.22XS | Exposure to reduction in atmospheric pressure while surfacing from underground, sequela | BILLABLE CODE |
| W94.23 | Exposure to sudden change in air pressure in aircraft during ascent | NON-BILLABLE CODE |
| W94.23XA | Exposure to sudden change in air pressure in aircraft during ascent, initial encounter | BILLABLE CODE |
| W94.23XD | Exposure to sudden change in air pressure in aircraft during ascent, subsequent encounter | BILLABLE CODE |
| W94.23XS | Exposure to sudden change in air pressure in aircraft during ascent, sequela | BILLABLE CODE |
| W94.29 | Exposure to other rapid changes in air pressure during ascent | NON-BILLABLE CODE |
| W94.29XA | Exposure to other rapid changes in air pressure during ascent, initial encounter | BILLABLE CODE |
| W94.29XD | Exposure to other rapid changes in air pressure during ascent, subsequent encounter | BILLABLE CODE |
| W94.29XS | Exposure to other rapid changes in air pressure during ascent, sequela | BILLABLE CODE |
