Chapter 20

V00–Y99: External Causes of Morbidity

External Causes of Morbidity diagnostic classification updated for 2026.

Internal Codes
  • X18

    Contact with other hot metals

  • X18.XXXA

    Contact with other hot metals, initial encounter

  • X18.XXXD

    Contact with other hot metals, subsequent encounter

  • X18.XXXS

    Contact with other hot metals, sequela

  • X19

    Contact with other heat and hot substances

  • X19.XXXA

    Contact with other heat and hot substances, initial encounter

  • X19.XXXD

    Contact with other heat and hot substances, subsequent encounter

  • X19.XXXS

    Contact with other heat and hot substances, sequela

  • X30

    Exposure to excessive natural heat

  • X30.XXXA

    Exposure to excessive natural heat, initial encounter

  • X30.XXXD

    Exposure to excessive natural heat, subsequent encounter

  • X30.XXXS

    Exposure to excessive natural heat, sequela

  • X31

    Exposure to excessive natural cold

  • X31.XXXA

    Exposure to excessive natural cold, initial encounter

  • X31.XXXD

    Exposure to excessive natural cold, subsequent encounter

  • X31.XXXS

    Exposure to excessive natural cold, sequela

  • X32

    Exposure to sunlight

  • X32.XXXA

    Exposure to sunlight, initial encounter

  • X32.XXXD

    Exposure to sunlight, subsequent encounter

  • X32.XXXS

    Exposure to sunlight, sequela

  • X34

    Earthquake

  • X34.XXXA

    Earthquake, initial encounter

  • X34.XXXD

    Earthquake, subsequent encounter

  • X34.XXXS

    Earthquake, sequela

  • X35

    Volcanic eruption

  • X35.XXXA

    Volcanic eruption, initial encounter

  • X35.XXXD

    Volcanic eruption, subsequent encounter

  • X35.XXXS

    Volcanic eruption, sequela

  • X36.0

    Collapse of dam or man-made structure causing earth movement

  • X36.0XXA

    Collapse of dam or man-made structure causing earth movement, initial encounter

  • X36.0XXD

    Collapse of dam or man-made structure causing earth movement, subsequent encounter

  • X36.0XXS

    Collapse of dam or man-made structure causing earth movement, sequela

  • X36.1

    Avalanche, landslide, or mudslide

  • X36.1XXA

    Avalanche, landslide, or mudslide, initial encounter

  • X36.1XXD

    Avalanche, landslide, or mudslide, subsequent encounter

  • X36.1XXS

    Avalanche, landslide, or mudslide, sequela

  • X37.0

    Hurricane

  • X37.0XXA

    Hurricane, initial encounter

  • X37.0XXD

    Hurricane, subsequent encounter

  • X37.0XXS

    Hurricane, sequela

  • X37.1

    Tornado

  • X37.1XXA

    Tornado, initial encounter

  • X37.1XXD

    Tornado, subsequent encounter

  • X37.1XXS

    Tornado, sequela

  • X37.2

    Blizzard (snow)(ice)

  • X37.2XXA

    Blizzard (snow)(ice), initial encounter

  • X37.2XXD

    Blizzard (snow)(ice), subsequent encounter

  • X37.2XXS

    Blizzard (snow)(ice), sequela

  • X37.3

    Dust storm

  • X37.3XXA

    Dust storm, initial encounter

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