Chapter 20

V00–Y99: External Causes of Morbidity

External Causes of Morbidity diagnostic classification updated for 2026.

Internal Codes
  • W92.XXXS

    Exposure to excessive heat of man-made origin, sequela

  • W93

    Exposure to excessive cold of man-made origin

  • W93.0

    Contact with or inhalation of dry ice

  • W93.01

    Contact with dry ice

  • W93.01XA

    Contact with dry ice, initial encounter

  • W93.01XD

    Contact with dry ice, subsequent encounter

  • W93.01XS

    Contact with dry ice, sequela

  • W93.02

    Inhalation of dry ice

  • W93.02XA

    Inhalation of dry ice, initial encounter

  • W93.02XD

    Inhalation of dry ice, subsequent encounter

  • W93.02XS

    Inhalation of dry ice, sequela

  • W93.1

    Contact with or inhalation of liquid air

  • W93.11

    Contact with liquid air

  • W93.11XA

    Contact with liquid air, initial encounter

  • W93.11XD

    Contact with liquid air, subsequent encounter

  • W93.11XS

    Contact with liquid air, sequela

  • W93.12

    Inhalation of liquid air

  • W93.12XA

    Inhalation of liquid air, initial encounter

  • W93.12XD

    Inhalation of liquid air, subsequent encounter

  • W93.12XS

    Inhalation of liquid air, sequela

  • W93.2

    Prolonged exposure in deep freeze unit or refrigerator

  • W93.2XXA

    Prolonged exposure in deep freeze unit or refrigerator, initial encounter

  • W93.2XXD

    Prolonged exposure in deep freeze unit or refrigerator, subsequent encounter

  • W93.2XXS

    Prolonged exposure in deep freeze unit or refrigerator, sequela

  • W93.8

    Exposure to other excessive cold of man-made origin

  • W93.8XXA

    Exposure to other excessive cold of man-made origin, initial encounter

  • W93.8XXD

    Exposure to other excessive cold of man-made origin, subsequent encounter

  • W93.8XXS

    Exposure to other excessive cold of man-made origin, sequela

  • W94

    Exposure to high and low air pressure and changes in air pressure

  • 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

  • W94.11

    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

  • W94.2

    Exposure to rapid changes in air pressure during ascent

  • W94.21

    Exposure to reduction in atmospheric pressure while surfacing from deep-water diving

  • W94.21XA

    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

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