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	—
W94.0XXA	Exposure to prolonged high air pressure, initial encounter	✓
W94.0XXD	Exposure to prolonged high air pressure, subsequent encounter	✓
W94.0XXS	Exposure to prolonged high air pressure, sequela	✓
W94.1	Exposure to prolonged low air pressure	—
W94.2	Exposure to rapid changes in air pressure during ascent	—
W94.3	Exposure to rapid changes in air pressure during descent	—
W94.11	Exposure to residence or prolonged visit at high altitude	—
W94.11XA	Exposure to residence or prolonged visit at high altitude, initial encounter	✓
W94.11XD	Exposure to residence or prolonged visit at high altitude, subsequent encounter	✓
W94.11XS	Exposure to residence or prolonged visit at high altitude, sequela	✓
W94.12	Exposure to other prolonged low air pressure	—
W94.12XA	Exposure to other prolonged low air pressure, initial encounter	✓
W94.12XD	Exposure to other prolonged low air pressure, subsequent encounter	✓
W94.12XS	Exposure to other prolonged low air pressure, sequela	✓
W94.21	Exposure to reduction in atmospheric pressure while surfacing from deep-water diving	—
W94.21XA	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	✓
W94.21XS	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	—
W94.22XA	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	✓
W94.22XS	Exposure to reduction in atmospheric pressure while surfacing from underground, sequela	✓
W94.23	Exposure to sudden change in air pressure in aircraft during ascent	—
W94.23XA	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	✓
W94.23XS	Exposure to sudden change in air pressure in aircraft during ascent, sequela	✓
W94.29	Exposure to other rapid changes in air pressure during ascent	—
W94.29XA	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	✓
W94.29XS	Exposure to other rapid changes in air pressure during ascent, sequela	✓
W94.31	Exposure to sudden change in air pressure in aircraft during descent	—
W94.31XA	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	✓
W94.31XS	Exposure to sudden change in air pressure in aircraft during descent, sequela	✓
W94.32	Exposure to high air pressure from rapid descent in water	—
W94.32XA	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	✓
W94.32XS	Exposure to high air pressure from rapid descent in water, sequela	✓
W94.39	Exposure to other rapid changes in air pressure during descent	—
W94.39XA	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	✓
W94.39XS	Exposure to other rapid changes in air pressure during descent, sequela	✓

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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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