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- The appropriate 7th character is to be added to each code from category W94
- A initial encounter
- D subsequent encounter
- S sequela
- W94.0 Exposure to prolonged high air pressure
- W94.1 Exposure to prolonged low air pressure
- W94.11 Exposure to residence or prolonged visit at high altitude
- W94.12 Exposure to other prolonged low air pressure
- W94.2 Exposure to rapid changes in air pressure during ascent
- W94.21 Exposure to reduction in atmospheric pressure while surfacing from deep-water diving
- W94.22 Exposure to reduction in atmospheric pressure while surfacing from underground
- W94.23 Exposure to sudden change in air pressure in aircraft during ascent
- W94.29 Exposure to other rapid changes in air pressure during ascent
- W94.3 Exposure to rapid changes in air pressure during descent
- W94.31 Exposure to sudden change in air pressure in aircraft during ascent or descent
- W94.32 Exposure to high air pressure from rapid descent in water
- W94.39 Exposure to other rapid changes in air pressure during descent
W99 Exposure to other man-made environmental factors
- The appropriate 7th character is to be added to code W99
- A initial encounter
- D subsequent encounter
- S sequela
Exposure to smoke, fire and flames (X00-X08)
- Excludes1: arson (X97)
- Excludes2: explosions (W35-W40)
- lightning (T75.0-)
- transport accident (V01-V99)
X00 Exposure to uncontrolled fire in building or structure
- Includes: Conflagration in building or structure
- Code first any associated cataclysm
- Excludes2: Exposure to ignition or melting of nightwear (X05)
- Exposure to ignition or melting of other clothing and apparel (JL:Jump,"X06">X06-)
- Exposure to other specified smoke, fire and flames (X08.-)
- The appropriate 7th character is to be added to each code from category X00
