W94Not billable, use a more specific code below
Exposure to high and low air pressure and changes in air pressure
In Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85-W99), chapter 20: External Causes of Morbidity
30 billable codes under W94: none are a CC or MCC; none map to an HCC.
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Instructional notes
Also applies, from Exposure to electric current, radiation and extreme ambient air temperature and pressure (W85-W99)
These notes sit on W85-W99 and apply to every code under it, including W94.
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers how to report external cause codes (V00-Y99) describing cause, intent, place, activity, and status. They are never principal or first-listed, and reporting is voluntary unless required.
- General External Cause Coding Guidelines (page 88)
- Place of Occurrence Guideline (page 89)
- Activity Code (page 89)
- Place of Occurrence, Activity, and Status Codes Used with other External Cause Code (page 89)
- If the Reporting Format Limits the Number of External Cause Codes (page 90)
- Multiple External Cause Coding Guidelines (page 90)
- Child and Adult Abuse Guideline (page 90)
- Unknown or Undetermined Intent Guideline (page 91)
All codes under W94
W94 can't be used on a claim. Pick a billable code below; grey headings group them.
- W94.0Exposure to prolonged high air pressure
- W94.0XXAExposure to prolonged high air pressure, initial encounter
- W94.0XXDExposure to prolonged high air pressure, subsequent encounter
- W94.0XXSExposure to prolonged high air pressure, sequela
- W94.1Exposure to prolonged low air pressure
- W94.11Exposure to residence or prolonged visit at high altitude
- W94.11XAExposure to residence or prolonged visit at high altitude, initial encounter
- W94.11XDExposure to residence or prolonged visit at high altitude, subsequent encounter
- W94.11XSExposure to residence or prolonged visit at high altitude, sequela
- W94.12Exposure to other prolonged low air pressure
- W94.12XAExposure to other prolonged low air pressure, initial encounter
- W94.12XDExposure to other prolonged low air pressure, subsequent encounter
- W94.12XSExposure to other prolonged low air pressure, sequela
- W94.2Exposure to rapid changes in air pressure during ascent
- W94.21Exposure to reduction in atmospheric pressure while surfacing from deep-water diving
- W94.21XAExposure to reduction in atmospheric pressure while surfacing from deep-water diving, initial encounter
- W94.21XDExposure to reduction in atmospheric pressure while surfacing from deep-water diving, subsequent encounter
- W94.21XSExposure to reduction in atmospheric pressure while surfacing from deep-water diving, sequela
- W94.22Exposure to reduction in atmospheric pressure while surfacing from underground
- W94.22XAExposure to reduction in atmospheric pressure while surfacing from underground, initial encounter
- W94.22XDExposure to reduction in atmospheric pressure while surfacing from underground, subsequent encounter
- W94.22XSExposure to reduction in atmospheric pressure while surfacing from underground, sequela
- W94.23Exposure to sudden change in air pressure in aircraft during ascent
- W94.23XAExposure to sudden change in air pressure in aircraft during ascent, initial encounter
- W94.23XDExposure to sudden change in air pressure in aircraft during ascent, subsequent encounter
- W94.23XSExposure to sudden change in air pressure in aircraft during ascent, sequela
- W94.29Exposure to other rapid changes in air pressure during ascent
- W94.29XAExposure to other rapid changes in air pressure during ascent, initial encounter
- W94.29XDExposure to other rapid changes in air pressure during ascent, subsequent encounter
- W94.29XSExposure to other rapid changes in air pressure during ascent, sequela
- W94.3Exposure to rapid changes in air pressure during descent
- W94.31Exposure to sudden change in air pressure in aircraft during descent
- W94.31XAExposure to sudden change in air pressure in aircraft during descent, initial encounter
- W94.31XDExposure to sudden change in air pressure in aircraft during descent, subsequent encounter
- W94.31XSExposure to sudden change in air pressure in aircraft during descent, sequela
- W94.32Exposure to high air pressure from rapid descent in water
- W94.32XAExposure to high air pressure from rapid descent in water, initial encounter
- W94.32XDExposure to high air pressure from rapid descent in water, subsequent encounter
- W94.32XSExposure to high air pressure from rapid descent in water, sequela
- W94.39Exposure to other rapid changes in air pressure during descent
- W94.39XAExposure to other rapid changes in air pressure during descent, initial encounter
- W94.39XDExposure to other rapid changes in air pressure during descent, subsequent encounter
- W94.39XSExposure to other rapid changes in air pressure during descent, sequela
W94 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
Other codes that refer to W94
Notes on these codes point to W94.
Code history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.