Chapter 20

V00–Y99: External Causes of Morbidity

External Causes of Morbidity diagnostic classification updated for 2026.

Internal Codes
  • 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

  • W94.3

    Exposure to rapid changes in air pressure during descent

  • 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

  • W99

    Exposure to other man-made environmental factors

  • W99.XXXA

    Exposure to other man-made environmental factors, initial encounter

  • W99.XXXD

    Exposure to other man-made environmental factors, subsequent encounter

  • W99.XXXS

    Exposure to other man-made environmental factors, sequela

  • X00

    Exposure to uncontrolled fire in building or structure

  • X00.0

    Exposure to flames in uncontrolled fire in building or structure

  • X00.0XXA

    Exposure to flames in uncontrolled fire in building or structure, initial encounter

  • X00.0XXD

    Exposure to flames in uncontrolled fire in building or structure, subsequent encounter

  • X00.0XXS

    Exposure to flames in uncontrolled fire in building or structure, sequela

  • X00.1

    Exposure to smoke in uncontrolled fire in building or structure

  • X00.1XXA

    Exposure to smoke in uncontrolled fire in building or structure, initial encounter

  • X00.1XXD

    Exposure to smoke in uncontrolled fire in building or structure, subsequent encounter

  • X00.1XXS

    Exposure to smoke in uncontrolled fire in building or structure, sequela

  • X00.2

    Injury due to collapse of burning building or structure in uncontrolled fire

  • X00.2XXA

    Injury due to collapse of burning building or structure in uncontrolled fire, initial encounter

  • X00.2XXD

    Injury due to collapse of burning building or structure in uncontrolled fire, subsequent encounter

  • X00.2XXS

    Injury due to collapse of burning building or structure in uncontrolled fire, sequela

  • X00.3

    Fall from burning building or structure in uncontrolled fire

  • X00.3XXA

    Fall from burning building or structure in uncontrolled fire, initial encounter

  • X00.3XXD

    Fall from burning building or structure in uncontrolled fire, subsequent encounter

  • X00.3XXS

    Fall from burning building or structure in uncontrolled fire, sequela

  • X00.4

    Hit by object from burning building or structure in uncontrolled fire

  • X00.4XXA

    Hit by object from burning building or structure in uncontrolled fire, initial encounter

  • X00.4XXD

    Hit by object from burning building or structure in uncontrolled fire, subsequent encounter

  • X00.4XXS

    Hit by object from burning building or structure in uncontrolled fire, sequela

  • X00.5

    Jump from burning building or structure in uncontrolled fire

  • X00.5XXA

    Jump from burning building or structure in uncontrolled fire, initial encounter

  • X00.5XXD

    Jump from burning building or structure in uncontrolled fire, subsequent encounter

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