Chapter 20

V00–Y99: External Causes of Morbidity

External Causes of Morbidity diagnostic classification updated for 2026.

Internal Codes
  • W52.XXXA

    Crushed, pushed or stepped on by crowd or human stampede, initial encounter

  • W52.XXXD

    Crushed, pushed or stepped on by crowd or human stampede, subsequent encounter

  • W52.XXXS

    Crushed, pushed or stepped on by crowd or human stampede, sequela

  • W53

    Contact with rodent

  • W53.0

    Contact with mouse

  • W53.01

    Bitten by mouse

  • W53.01XA

    Bitten by mouse, initial encounter

  • W53.01XD

    Bitten by mouse, subsequent encounter

  • W53.01XS

    Bitten by mouse, sequela

  • W53.09

    Other contact with mouse

  • W53.09XA

    Other contact with mouse, initial encounter

  • W53.09XD

    Other contact with mouse, subsequent encounter

  • W53.09XS

    Other contact with mouse, sequela

  • W53.1

    Contact with rat

  • W53.11

    Bitten by rat

  • W53.11XA

    Bitten by rat, initial encounter

  • W53.11XD

    Bitten by rat, subsequent encounter

  • W53.11XS

    Bitten by rat, sequela

  • W53.19

    Other contact with rat

  • W53.19XA

    Other contact with rat, initial encounter

  • W53.19XD

    Other contact with rat, subsequent encounter

  • W53.19XS

    Other contact with rat, sequela

  • W53.2

    Contact with squirrel

  • W53.21

    Bitten by squirrel

  • W53.21XA

    Bitten by squirrel, initial encounter

  • W53.21XD

    Bitten by squirrel, subsequent encounter

  • W53.21XS

    Bitten by squirrel, sequela

  • W53.29

    Other contact with squirrel

  • W53.29XA

    Other contact with squirrel, initial encounter

  • W53.29XD

    Other contact with squirrel, subsequent encounter

  • W53.29XS

    Other contact with squirrel, sequela

  • W53.8

    Contact with other rodent

  • W53.81

    Bitten by other rodent

  • W53.81XA

    Bitten by other rodent, initial encounter

  • W53.81XD

    Bitten by other rodent, subsequent encounter

  • W53.81XS

    Bitten by other rodent, sequela

  • W53.89

    Other contact with other rodent

  • W53.89XA

    Other contact with other rodent, initial encounter

  • W53.89XD

    Other contact with other rodent, subsequent encounter

  • W53.89XS

    Other contact with other rodent, sequela

  • W54

    Contact with dog

  • W54.0

    Bitten by dog

  • W54.0XXA

    Bitten by dog, initial encounter

  • W54.0XXD

    Bitten by dog, subsequent encounter

  • W54.0XXS

    Bitten by dog, sequela

  • W54.1

    Struck by dog

  • W54.1XXA

    Struck by dog, initial encounter

  • W54.1XXD

    Struck by dog, subsequent encounter

  • W54.1XXS

    Struck by dog, sequela

  • W54.8

    Other contact with dog

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