ICD-10-CM category
W94: Exposure to high and low air pressure and changes in air pressure
Codes under W94 (Exposure to high and low air pressure and changes in air pressure). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| W94.0 | Exposure to prolonged high air pressure | — |
| W94.0 | Exposure to prolonged high air pressure | — |
| W94.0XXA | Exposure to prolonged high air pressure, initial encounter | ✓ |
| W94.0XXA | Exposure to prolonged high air pressure, initial encounter | ✓ |
| W94.0XXD | Exposure to prolonged high air pressure, subsequent encounter | ✓ |
| W94.0XXD | Exposure to prolonged high air pressure, subsequent encounter | ✓ |
| W94.0XXS | Exposure to prolonged high air pressure, sequela | ✓ |
| W94.0XXS | Exposure to prolonged high air pressure, sequela | ✓ |
| W94.1 | Exposure to prolonged low air pressure | — |
| W94.1 | Exposure to prolonged low air pressure | — |
| W94.2 | Exposure to rapid changes in air pressure during ascent | — |
| W94.2 | Exposure to rapid changes in air pressure during ascent | — |
| W94.3 | Exposure to rapid changes in air pressure during descent | — |
| W94.3 | Exposure to rapid changes in air pressure during descent | — |
| W94.11 | Exposure to residence or prolonged visit at high altitude | — |
| W94.11 | Exposure to residence or prolonged visit at high altitude | — |
| W94.11XA | Exposure to residence or prolonged visit at high altitude, initial encounter | ✓ |
| W94.11XA | Exposure to residence or prolonged visit at high altitude, initial encounter | ✓ |
| W94.11XD | Exposure to residence or prolonged visit at high altitude, subsequent encounter | ✓ |
| W94.11XD | Exposure to residence or prolonged visit at high altitude, subsequent encounter | ✓ |
| W94.11XS | Exposure to residence or prolonged visit at high altitude, sequela | ✓ |
| W94.11XS | Exposure to residence or prolonged visit at high altitude, sequela | ✓ |
| W94.12 | Exposure to other prolonged low air pressure | — |
| W94.12 | Exposure to other prolonged low air pressure | — |
| W94.12XA | Exposure to other prolonged low air pressure, initial encounter | ✓ |
| W94.12XA | Exposure to other prolonged low air pressure, initial encounter | ✓ |
| W94.12XD | Exposure to other prolonged low air pressure, subsequent encounter | ✓ |
| W94.12XD | Exposure to other prolonged low air pressure, subsequent encounter | ✓ |
| W94.12XS | Exposure to other prolonged low air pressure, sequela | ✓ |
| W94.12XS | Exposure to other prolonged low air pressure, sequela | ✓ |
| W94.21 | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving | — |
| W94.21 | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving | — |
| W94.21XA | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, initial encounter | ✓ |
| W94.21XA | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, initial encounter | ✓ |
| W94.21XD | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, subsequent encounter | ✓ |
| W94.21XD | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, subsequent encounter | ✓ |
| W94.21XS | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, sequela | ✓ |
| W94.21XS | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, sequela | ✓ |
| W94.22 | Exposure to reduction in atmospheric pressure while surfacing from underground | — |
| W94.22 | Exposure to reduction in atmospheric pressure while surfacing from underground | — |
| W94.22XA | Exposure to reduction in atmospheric pressure while surfacing from underground, initial encounter | ✓ |
| W94.22XA | Exposure to reduction in atmospheric pressure while surfacing from underground, initial encounter | ✓ |
| W94.22XD | Exposure to reduction in atmospheric pressure while surfacing from underground, subsequent encounter | ✓ |
| W94.22XD | Exposure to reduction in atmospheric pressure while surfacing from underground, subsequent encounter | ✓ |
| W94.22XS | Exposure to reduction in atmospheric pressure while surfacing from underground, sequela | ✓ |
| W94.22XS | Exposure to reduction in atmospheric pressure while surfacing from underground, sequela | ✓ |
| W94.23 | Exposure to sudden change in air pressure in aircraft during ascent | — |
| W94.23 | Exposure to sudden change in air pressure in aircraft during ascent | — |
| W94.23XA | Exposure to sudden change in air pressure in aircraft during ascent, initial encounter | ✓ |
| W94.23XA | Exposure to sudden change in air pressure in aircraft during ascent, initial encounter | ✓ |
| W94.23XD | Exposure to sudden change in air pressure in aircraft during ascent, subsequent encounter | ✓ |
| W94.23XD | Exposure to sudden change in air pressure in aircraft during ascent, subsequent encounter | ✓ |
| W94.23XS | Exposure to sudden change in air pressure in aircraft during ascent, sequela | ✓ |
| W94.23XS | Exposure to sudden change in air pressure in aircraft during ascent, sequela | ✓ |
| W94.29 | Exposure to other rapid changes in air pressure during ascent | — |
| W94.29 | Exposure to other rapid changes in air pressure during ascent | — |
| W94.29XA | Exposure to other rapid changes in air pressure during ascent, initial encounter | ✓ |
| W94.29XA | Exposure to other rapid changes in air pressure during ascent, initial encounter | ✓ |
| W94.29XD | Exposure to other rapid changes in air pressure during ascent, subsequent encounter | ✓ |
| W94.29XD | Exposure to other rapid changes in air pressure during ascent, subsequent encounter | ✓ |
| W94.29XS | Exposure to other rapid changes in air pressure during ascent, sequela | ✓ |
| W94.29XS | Exposure to other rapid changes in air pressure during ascent, sequela | ✓ |
| W94.31 | Exposure to sudden change in air pressure in aircraft during descent | — |
| W94.31 | Exposure to sudden change in air pressure in aircraft during descent | — |
| W94.31XA | Exposure to sudden change in air pressure in aircraft during descent, initial encounter | ✓ |
| W94.31XA | Exposure to sudden change in air pressure in aircraft during descent, initial encounter | ✓ |
| W94.31XD | Exposure to sudden change in air pressure in aircraft during descent, subsequent encounter | ✓ |
| W94.31XD | Exposure to sudden change in air pressure in aircraft during descent, subsequent encounter | ✓ |
| W94.31XS | Exposure to sudden change in air pressure in aircraft during descent, sequela | ✓ |
| W94.31XS | Exposure to sudden change in air pressure in aircraft during descent, sequela | ✓ |
| W94.32 | Exposure to high air pressure from rapid descent in water | — |
| W94.32 | Exposure to high air pressure from rapid descent in water | — |
| W94.32XA | Exposure to high air pressure from rapid descent in water, initial encounter | ✓ |
| W94.32XA | Exposure to high air pressure from rapid descent in water, initial encounter | ✓ |
| W94.32XD | Exposure to high air pressure from rapid descent in water, subsequent encounter | ✓ |
| W94.32XD | Exposure to high air pressure from rapid descent in water, subsequent encounter | ✓ |
| W94.32XS | Exposure to high air pressure from rapid descent in water, sequela | ✓ |
| W94.32XS | Exposure to high air pressure from rapid descent in water, sequela | ✓ |
| W94.39 | Exposure to other rapid changes in air pressure during descent | — |
| W94.39 | Exposure to other rapid changes in air pressure during descent | — |
| W94.39XA | Exposure to other rapid changes in air pressure during descent, initial encounter | ✓ |
| W94.39XA | Exposure to other rapid changes in air pressure during descent, initial encounter | ✓ |
| W94.39XD | Exposure to other rapid changes in air pressure during descent, subsequent encounter | ✓ |
| W94.39XD | Exposure to other rapid changes in air pressure during descent, subsequent encounter | ✓ |
| W94.39XS | Exposure to other rapid changes in air pressure during descent, sequela | ✓ |
| W94.39XS | Exposure to other rapid changes in air pressure during descent, sequela | ✓ |
Frequently asked questions
What is ICD-10-CM code W94?
W94 is an ICD-10-CM category covering Exposure to high and low air pressure and changes in air pressure. It contains 86 more specific diagnosis codes, 60 of which are billable.
Is W94 a billable code?
No — W94 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example W94.0 — Exposure to prolonged high air pressure). 60 of the 86 codes under W94 are billable.
What codes fall under W94?
W94 includes W94.0, W94.0, W94.0XXA, W94.0XXA, W94.0XXD, plus 81 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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