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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T42.2X6|
Underdosing of succinimides and oxazolidinediones
T42.2X6A|
Underdosing of succinimides and oxazolidinediones, initial encounter
T42.2X6D|
Underdosing of succinimides and oxazolidinediones, subsequent encounter
T42.2X6S|
Underdosing of succinimides and oxazolidinediones, sequela
T42.3|
Poisoning by, adverse effect of and underdosing of barbiturates
T42.3X|
Poisoning by, adverse effect of and underdosing of barbiturates
T42.3X1|
Poisoning by barbiturates, accidental (unintentional)
T42.3X1A|
Poisoning by barbiturates, accidental (unintentional), initial encounter
T42.3X1D|
Poisoning by barbiturates, accidental (unintentional), subsequent encounter
T42.3X1S|
Poisoning by barbiturates, accidental (unintentional), sequela
T42.3X2|
Poisoning by barbiturates, intentional self-harm
T42.3X2A|
Poisoning by barbiturates, intentional self-harm, initial encounter
T42.3X2D|
Poisoning by barbiturates, intentional self-harm, subsequent encounter
T42.3X2S|
Poisoning by barbiturates, intentional self-harm, sequela
T42.3X3|
Poisoning by barbiturates, assault
T42.3X3A|
Poisoning by barbiturates, assault, initial encounter
T42.3X3D|
Poisoning by barbiturates, assault, subsequent encounter
T42.3X3S|
Poisoning by barbiturates, assault, sequela
T42.3X4|
Poisoning by barbiturates, undetermined
T42.3X4A|
Poisoning by barbiturates, undetermined, initial encounter
T42.3X4D|
Poisoning by barbiturates, undetermined, subsequent encounter
T42.3X4S|
Poisoning by barbiturates, undetermined, sequela
T42.3X5|
Adverse effect of barbiturates
T42.3X5A|
Adverse effect of barbiturates, initial encounter
T42.3X5D|
Adverse effect of barbiturates, subsequent encounter
T42.3X5S|
Adverse effect of barbiturates, sequela
T42.3X6|
Underdosing of barbiturates
T42.3X6A|
Underdosing of barbiturates, initial encounter
T42.3X6D|
Underdosing of barbiturates, subsequent encounter
T42.3X6S|
Underdosing of barbiturates, sequela
T42.4|
Poisoning by, adverse effect of and underdosing of benzodiazepines
T42.4X|
Poisoning by, adverse effect of and underdosing of benzodiazepines
T42.4X1|
Poisoning by benzodiazepines, accidental (unintentional)
T42.4X1A|
Poisoning by benzodiazepines, accidental (unintentional), initial encounter
T42.4X1D|
Poisoning by benzodiazepines, accidental (unintentional), subsequent encounter
T42.4X1S|
Poisoning by benzodiazepines, accidental (unintentional), sequela
T42.4X2|
Poisoning by benzodiazepines, intentional self-harm
T42.4X2A|
Poisoning by benzodiazepines, intentional self-harm, initial encounter
T42.4X2D|
Poisoning by benzodiazepines, intentional self-harm, subsequent encounter
T42.4X2S|
Poisoning by benzodiazepines, intentional self-harm, sequela
T42.4X3|
Poisoning by benzodiazepines, assault
T42.4X3A|
Poisoning by benzodiazepines, assault, initial encounter
T42.4X3D|
Poisoning by benzodiazepines, assault, subsequent encounter
T42.4X3S|
Poisoning by benzodiazepines, assault, sequela
T42.4X4|
Poisoning by benzodiazepines, undetermined
T42.4X4A|
Poisoning by benzodiazepines, undetermined, initial encounter
T42.4X4D|
Poisoning by benzodiazepines, undetermined, subsequent encounter
T42.4X4S|
Poisoning by benzodiazepines, undetermined, sequela
T42.4X5|
Adverse effect of benzodiazepines
T42.4X5A|
Adverse effect of benzodiazepines, initial encounter

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