Chapter 20

V00–Y99: External Causes of Morbidity

External Causes of Morbidity diagnostic classification updated for 2026.

Internal Codes
  • W31.9

    Contact with unspecified machinery

  • W31.9XXA

    Contact with unspecified machinery, initial encounter

  • W31.9XXD

    Contact with unspecified machinery, subsequent encounter

  • W31.9XXS

    Contact with unspecified machinery, sequela

  • W32.0

    Accidental handgun discharge

  • W32.0XXA

    Accidental handgun discharge, initial encounter

  • W32.0XXD

    Accidental handgun discharge, subsequent encounter

  • W32.0XXS

    Accidental handgun discharge, sequela

  • W32.1

    Accidental handgun malfunction

  • W32.1XXA

    Accidental handgun malfunction, initial encounter

  • W32.1XXD

    Accidental handgun malfunction, subsequent encounter

  • W32.1XXS

    Accidental handgun malfunction, sequela

  • W33.00

    Accidental discharge of unspecified larger firearm

  • W33.00XA

    Accidental discharge of unspecified larger firearm, initial encounter

  • W33.00XD

    Accidental discharge of unspecified larger firearm, subsequent encounter

  • W33.00XS

    Accidental discharge of unspecified larger firearm, sequela

  • W33.01

    Accidental discharge of shotgun

  • W33.01XA

    Accidental discharge of shotgun, initial encounter

  • W33.01XD

    Accidental discharge of shotgun, subsequent encounter

  • W33.01XS

    Accidental discharge of shotgun, sequela

  • W33.02

    Accidental discharge of hunting rifle

  • W33.02XA

    Accidental discharge of hunting rifle, initial encounter

  • W33.02XD

    Accidental discharge of hunting rifle, subsequent encounter

  • W33.02XS

    Accidental discharge of hunting rifle, sequela

  • W33.03

    Accidental discharge of machine gun

  • W33.03XA

    Accidental discharge of machine gun, initial encounter

  • W33.03XD

    Accidental discharge of machine gun, subsequent encounter

  • W33.03XS

    Accidental discharge of machine gun, sequela

  • W33.09

    Accidental discharge of other larger firearm

  • W33.09XA

    Accidental discharge of other larger firearm, initial encounter

  • W33.09XD

    Accidental discharge of other larger firearm, subsequent encounter

  • W33.09XS

    Accidental discharge of other larger firearm, sequela

  • W33.10

    Accidental malfunction of unspecified larger firearm

  • W33.10XA

    Accidental malfunction of unspecified larger firearm, initial encounter

  • W33.10XD

    Accidental malfunction of unspecified larger firearm, subsequent encounter

  • W33.10XS

    Accidental malfunction of unspecified larger firearm, sequela

  • W33.11

    Accidental malfunction of shotgun

  • W33.11XA

    Accidental malfunction of shotgun, initial encounter

  • W33.11XD

    Accidental malfunction of shotgun, subsequent encounter

  • W33.11XS

    Accidental malfunction of shotgun, sequela

  • W33.12

    Accidental malfunction of hunting rifle

  • W33.12XA

    Accidental malfunction of hunting rifle, initial encounter

  • W33.12XD

    Accidental malfunction of hunting rifle, subsequent encounter

  • W33.12XS

    Accidental malfunction of hunting rifle, sequela

  • W33.13

    Accidental malfunction of machine gun

  • W33.13XA

    Accidental malfunction of machine gun, initial encounter

  • W33.13XD

    Accidental malfunction of machine gun, subsequent encounter

  • W33.13XS

    Accidental malfunction of machine gun, sequela

  • W33.19

    Accidental malfunction of other larger firearm

  • W33.19XA

    Accidental malfunction of other larger firearm, initial encounter

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