ICD-10-CM code · FY2027
W94 Exposure to high and low air pressure and changes in air pressure
Header codeNot billable: use one of the 30 billable codes below
About W94
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Coding notes for W94
7th character
- The appropriate 7th character is to be added to each code from category W94
7th character Required: add one of these as the 7th character, with X as a placeholder to fill six characters.
| Character | Meaning |
|---|---|
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
Block W85-W99 notes (apply to every code in it)
Excludes1 Not coded here: never report these together with this code (use the code given instead).
Chapter 20 notes (apply to every code in it)
Note
- This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.
Codes under W94 43
- W94.0 Exposure to prolonged high air pressureHeader
- W94.0XXA Exposure to prolonged high air pressure, initial encounterBillable
- W94.0XXD Exposure to prolonged high air pressure, subsequent encounterBillable
- W94.0XXS Exposure to prolonged high air pressure, sequelaBillable
- W94.1 Exposure to prolonged low air pressureHeader
- W94.11 Exposure to residence or prolonged visit at high altitudeHeader
- W94.11XA Exposure to residence or prolonged visit at high altitude, initial encounterBillable
- W94.11XD Exposure to residence or prolonged visit at high altitude, subsequent encounterBillable
- W94.11XS Exposure to residence or prolonged visit at high altitude, sequelaBillable
- W94.12 Exposure to other prolonged low air pressureHeader
- W94.12XA Exposure to other prolonged low air pressure, initial encounterBillable
- W94.12XD Exposure to other prolonged low air pressure, subsequent encounterBillable
- W94.12XS Exposure to other prolonged low air pressure, sequelaBillable
- W94.2 Exposure to rapid changes in air pressure during ascentHeader
- W94.21 Exposure to reduction in atmospheric pressure while surfacing from deep-water divingHeader
- W94.21XA Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, initial encounterBillable
- W94.21XD Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, subsequent encounterBillable
- W94.21XS Exposure to reduction in atmospheric pressure while surfacing from deep-water diving, sequelaBillable
- W94.22 Exposure to reduction in atmospheric pressure while surfacing from undergroundHeader
- W94.22XA Exposure to reduction in atmospheric pressure while surfacing from underground, initial encounterBillable
- W94.22XD Exposure to reduction in atmospheric pressure while surfacing from underground, subsequent encounterBillable
- W94.22XS Exposure to reduction in atmospheric pressure while surfacing from underground, sequelaBillable
- W94.23 Exposure to sudden change in air pressure in aircraft during ascentHeader
- W94.23XA Exposure to sudden change in air pressure in aircraft during ascent, initial encounterBillable
- W94.23XD Exposure to sudden change in air pressure in aircraft during ascent, subsequent encounterBillable
- W94.23XS Exposure to sudden change in air pressure in aircraft during ascent, sequelaBillable
- W94.29 Exposure to other rapid changes in air pressure during ascentHeader
- W94.29XA Exposure to other rapid changes in air pressure during ascent, initial encounterBillable
- W94.29XD Exposure to other rapid changes in air pressure during ascent, subsequent encounterBillable
- W94.29XS Exposure to other rapid changes in air pressure during ascent, sequelaBillable
- W94.3 Exposure to rapid changes in air pressure during descentHeader
- W94.31 Exposure to sudden change in air pressure in aircraft during descentHeader
- W94.31XA Exposure to sudden change in air pressure in aircraft during descent, initial encounterBillable
- W94.31XD Exposure to sudden change in air pressure in aircraft during descent, subsequent encounterBillable
- W94.31XS Exposure to sudden change in air pressure in aircraft during descent, sequelaBillable
- W94.32 Exposure to high air pressure from rapid descent in waterHeader
- W94.32XA Exposure to high air pressure from rapid descent in water, initial encounterBillable
- W94.32XD Exposure to high air pressure from rapid descent in water, subsequent encounterBillable
- W94.32XS Exposure to high air pressure from rapid descent in water, sequelaBillable
- W94.39 Exposure to other rapid changes in air pressure during descentHeader
- W94.39XA Exposure to other rapid changes in air pressure during descent, initial encounterBillable
- W94.39XD Exposure to other rapid changes in air pressure during descent, subsequent encounterBillable
- W94.39XS Exposure to other rapid changes in air pressure during descent, sequelaBillable
Other categories in W85-W99
- W85 Exposure to electric transmission linesHeader
- W86 Exposure to other specified electric currentHeader
- W88 Exposure to ionizing radiationHeader
- W89 Exposure to man-made visible and ultraviolet lightHeader
- W90 Exposure to other nonionizing radiationHeader
- W92 Exposure to excessive heat of man-made originHeader
- W93 Exposure to excessive cold of man-made originHeader
- W99 Exposure to other man-made environmental factorsHeader
Latest research on exposure to high and low air pressure and changes in air pressure
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See 2MM+ plansICD-10-CM FY2027 code set, as published by the CDC National Center for Health Statistics (NCHS) and CMS, effective October 1, 2026 to September 30, 2027. Codes, titles and notes are shown as published. Check payer rules and the official guidelines before billing. This page is not medical advice.
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