Chapter 19

S00–T88: Injury, Poisoning and Certain Other Consequences of External Causes

Injury, Poisoning and Certain Other Consequences of External Causes diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
Use Additional Code
  • code to identify any retained foreign body, if applicable (Z18.-)
Internal Codes
  • T40.3X1S|

    Poisoning by methadone, accidental (unintentional), sequela

  • T40.3X2|

    Poisoning by methadone, intentional self-harm

  • T40.3X2A|

    Poisoning by methadone, intentional self-harm, initial encounter

  • T40.3X2D|

    Poisoning by methadone, intentional self-harm, subsequent encounter

  • T40.3X2S|

    Poisoning by methadone, intentional self-harm, sequela

  • T40.3X3|

    Poisoning by methadone, assault

  • T40.3X3A|

    Poisoning by methadone, assault, initial encounter

  • T40.3X3D|

    Poisoning by methadone, assault, subsequent encounter

  • T40.3X3S|

    Poisoning by methadone, assault, sequela

  • T40.3X4|

    Poisoning by methadone, undetermined

  • T40.3X4A|

    Poisoning by methadone, undetermined, initial encounter

  • T40.3X4D|

    Poisoning by methadone, undetermined, subsequent encounter

  • T40.3X4S|

    Poisoning by methadone, undetermined, sequela

  • T40.3X5|

    Adverse effect of methadone

  • T40.3X5A|

    Adverse effect of methadone, initial encounter

  • T40.3X5D|

    Adverse effect of methadone, subsequent encounter

  • T40.3X5S|

    Adverse effect of methadone, sequela

  • T40.3X6|

    Underdosing of methadone

  • T40.3X6A|

    Underdosing of methadone, initial encounter

  • T40.3X6D|

    Underdosing of methadone, subsequent encounter

  • T40.3X6S|

    Underdosing of methadone, sequela

  • T40.4|

    Poisoning by, adverse effect of and underdosing of other synthetic narcotics

  • T40.41|

    Poisoning by, adverse effect of and underdosing of fentanyl or fentanyl analogs

  • T40.411|

    Poisoning by fentanyl or fentanyl analogs, accidental (unintentional)

  • T40.411A|

    Poisoning by fentanyl or fentanyl analogs, accidental (unintentional), initial encounter

  • T40.411D|

    Poisoning by fentanyl or fentanyl analogs, accidental (unintentional), subsequent encounter

  • T40.411S|

    Poisoning by fentanyl or fentanyl analogs, accidental (unintentional), sequela

  • T40.412|

    Poisoning by fentanyl or fentanyl analogs, intentional self-harm

  • T40.412A|

    Poisoning by fentanyl or fentanyl analogs, intentional self-harm, initial encounter

  • T40.412D|

    Poisoning by fentanyl or fentanyl analogs, intentional self-harm, subsequent encounter

  • T40.412S|

    Poisoning by fentanyl or fentanyl analogs, intentional self-harm, sequela

  • T40.413|

    Poisoning by fentanyl or fentanyl analogs, assault

  • T40.413A|

    Poisoning by fentanyl or fentanyl analogs, assault, initial encounter

  • T40.413D|

    Poisoning by fentanyl or fentanyl analogs, assault, subsequent encounter

  • T40.413S|

    Poisoning by fentanyl or fentanyl analogs, assault, sequela

  • T40.414|

    Poisoning by fentanyl or fentanyl analogs, undetermined

  • T40.414A|

    Poisoning by fentanyl or fentanyl analogs, undetermined, initial encounter

  • T40.414D|

    Poisoning by fentanyl or fentanyl analogs, undetermined, subsequent encounter

  • T40.414S|

    Poisoning by fentanyl or fentanyl analogs, undetermined, sequela

  • T40.415|

    Adverse effect of fentanyl or fentanyl analogs

  • T40.415A|

    Adverse effect of fentanyl or fentanyl analogs, initial encounter

  • T40.415D|

    Adverse effect of fentanyl or fentanyl analogs, subsequent encounter

  • T40.415S|

    Adverse effect of fentanyl or fentanyl analogs, sequela

  • T40.416|

    Underdosing of fentanyl or fentanyl analogs

  • T40.416A|

    Underdosing of fentanyl or fentanyl analogs, initial encounter

  • T40.416D|

    Underdosing of fentanyl or fentanyl analogs, subsequent encounter

  • T40.416S|

    Underdosing of fentanyl or fentanyl analogs, sequela

  • T40.42|

    Poisoning by, adverse effect of and underdosing of tramadol

  • T40.421|

    Poisoning by tramadol, accidental (unintentional)

  • T40.421A|

    Poisoning by tramadol, accidental (unintentional), initial encounter

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