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.)

birth trauma (P10-P15)
obstetric trauma (O70-O71)

Use Additional Code

code to identify any retained foreign body, if applicable (Z18.-)

All Codes Billable Only

Internal Codes

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T40.0X6S|
Underdosing of opium, sequela
T40.1|
Poisoning by and adverse effect of heroin
T40.1X|
Poisoning by and adverse effect of heroin
T40.1X1|
Poisoning by heroin, accidental (unintentional)
T40.1X1A|
Poisoning by heroin, accidental (unintentional), initial encounter
T40.1X1D|
Poisoning by heroin, accidental (unintentional), subsequent encounter
T40.1X1S|
Poisoning by heroin, accidental (unintentional), sequela
T40.1X2|
Poisoning by heroin, intentional self-harm
T40.1X2A|
Poisoning by heroin, intentional self-harm, initial encounter
T40.1X2D|
Poisoning by heroin, intentional self-harm, subsequent encounter
T40.1X2S|
Poisoning by heroin, intentional self-harm, sequela
T40.1X3|
Poisoning by heroin, assault
T40.1X3A|
Poisoning by heroin, assault, initial encounter
T40.1X3D|
Poisoning by heroin, assault, subsequent encounter
T40.1X3S|
Poisoning by heroin, assault, sequela
T40.1X4|
Poisoning by heroin, undetermined
T40.1X4A|
Poisoning by heroin, undetermined, initial encounter
T40.1X4D|
Poisoning by heroin, undetermined, subsequent encounter
T40.1X4S|
Poisoning by heroin, undetermined, sequela
T40.2|
Poisoning by, adverse effect of and underdosing of other opioids
T40.2X|
Poisoning by, adverse effect of and underdosing of other opioids
T40.2X1|
Poisoning by other opioids, accidental (unintentional)
T40.2X1A|
Poisoning by other opioids, accidental (unintentional), initial encounter
T40.2X1D|
Poisoning by other opioids, accidental (unintentional), subsequent encounter
T40.2X1S|
Poisoning by other opioids, accidental (unintentional), sequela
T40.2X2|
Poisoning by other opioids, intentional self-harm
T40.2X2A|
Poisoning by other opioids, intentional self-harm, initial encounter
T40.2X2D|
Poisoning by other opioids, intentional self-harm, subsequent encounter
T40.2X2S|
Poisoning by other opioids, intentional self-harm, sequela
T40.2X3|
Poisoning by other opioids, assault
T40.2X3A|
Poisoning by other opioids, assault, initial encounter
T40.2X3D|
Poisoning by other opioids, assault, subsequent encounter
T40.2X3S|
Poisoning by other opioids, assault, sequela
T40.2X4|
Poisoning by other opioids, undetermined
T40.2X4A|
Poisoning by other opioids, undetermined, initial encounter
T40.2X4D|
Poisoning by other opioids, undetermined, subsequent encounter
T40.2X4S|
Poisoning by other opioids, undetermined, sequela
T40.2X5|
Adverse effect of other opioids
T40.2X5A|
Adverse effect of other opioids, initial encounter
T40.2X5D|
Adverse effect of other opioids, subsequent encounter
T40.2X5S|
Adverse effect of other opioids, sequela
T40.2X6|
Underdosing of other opioids
T40.2X6A|
Underdosing of other opioids, initial encounter
T40.2X6D|
Underdosing of other opioids, subsequent encounter
T40.2X6S|
Underdosing of other opioids, sequela
T40.3|
Poisoning by, adverse effect of and underdosing of methadone
T40.3X|
Poisoning by, adverse effect of and underdosing of methadone
T40.3X1|
Poisoning by methadone, accidental (unintentional)
T40.3X1A|
Poisoning by methadone, accidental (unintentional), initial encounter
T40.3X1D|
Poisoning by methadone, accidental (unintentional), subsequent encounter

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