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T42 Antiepileptic, sedative- hypnotic and antiparkinsonism drugs

ICD-10-CM category T42 sits in Chapter 20 (External causes of morbidity, V00-Y99). It contains 162 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.

Subcategories

T42.0 Hydantoin derivativesT42.0X Hydantoin derivativesT42.0X1 Poisoning by hydantoin derivatives, accidentalT42.0X2 Poisoning by hydantoin derivatives, intentional self-harmT42.0X3 Poisoning by hydantoin derivatives, assaultT42.0X4 Poisoning by hydantoin derivatives, undeterminedT42.0X5 Adverse effect of hydantoin derivativesT42.0X6 Underdosing of hydantoin derivativesT42.1 IminostilbenesT42.1X IminostilbenesT42.1X1 Poisoning by iminostilbenes, accidental (unintentional)T42.1X2 Poisoning by iminostilbenes, intentional self-harmT42.1X3 Poisoning by iminostilbenes, assaultT42.1X4 Poisoning by iminostilbenes, undeterminedT42.1X5 Adverse effect of iminostilbenesT42.1X6 Underdosing of iminostilbenesT42.2 Succinimides and oxazolidinedionesT42.2X Succinimides and oxazolidinedionesT42.2X1 Poisoning by succinimides and oxazolidinediones, accidentalT42.2X2 Poisoning by succinimides and oxazolidinediones, self-harmT42.2X3 Poisoning by succinimides and oxazolidinediones, assaultT42.2X4 Poisoning by succinimides and oxazolidinediones, undetT42.2X5 Adverse effect of succinimides and oxazolidinedionesT42.2X6 Underdosing of succinimides and oxazolidinedionesT42.3 BarbituratesT42.3X BarbituratesT42.3X1 Poisoning by barbiturates, accidental (unintentional)T42.3X2 Poisoning by barbiturates, intentional self-harmT42.3X3 Poisoning by barbiturates, assaultT42.3X4 Poisoning by barbiturates, undeterminedT42.3X5 Adverse effect of barbituratesT42.3X6 Underdosing of barbituratesT42.4 BenzodiazepinesT42.4X BenzodiazepinesT42.4X1 Poisoning by benzodiazepines, accidental (unintentional)T42.4X2 Poisoning by benzodiazepines, intentional self-harmT42.4X3 Poisoning by benzodiazepines, assaultT42.4X4 Poisoning by benzodiazepines, undeterminedT42.4X5 Adverse effect of benzodiazepinesT42.4X6 Underdosing of benzodiazepines

Billable codes in T42

CodeDescription
T42.0X1APoisoning by hydantoin derivatives, accidental (unintentional), initial encounter
T42.0X1DPoisoning by hydantoin derivatives, accidental (unintentional), subsequent encounter
T42.0X1SPoisoning by hydantoin derivatives, accidental (unintentional), sequela
T42.0X2APoisoning by hydantoin derivatives, intentional self-harm, initial encounter
T42.0X2DPoisoning by hydantoin derivatives, intentional self-harm, subsequent encounter
T42.0X2SPoisoning by hydantoin derivatives, intentional self-harm, sequela
T42.0X3APoisoning by hydantoin derivatives, assault, initial encounter
T42.0X3DPoisoning by hydantoin derivatives, assault, subsequent encounter
T42.0X3SPoisoning by hydantoin derivatives, assault, sequela
T42.0X4APoisoning by hydantoin derivatives, undetermined, initial encounter
T42.0X4DPoisoning by hydantoin derivatives, undetermined, subsequent encounter
T42.0X4SPoisoning by hydantoin derivatives, undetermined, sequela
T42.0X5AAdverse effect of hydantoin derivatives, initial encounter
T42.0X5DAdverse effect of hydantoin derivatives, subsequent encounter
T42.0X5SAdverse effect of hydantoin derivatives, sequela
T42.0X6AUnderdosing of hydantoin derivatives, initial encounter
T42.0X6DUnderdosing of hydantoin derivatives, subsequent encounter
T42.0X6SUnderdosing of hydantoin derivatives, sequela
T42.1X1APoisoning by iminostilbenes, accidental (unintentional), initial encounter
T42.1X1DPoisoning by iminostilbenes, accidental (unintentional), subsequent encounter
T42.1X1SPoisoning by iminostilbenes, accidental (unintentional), sequela
T42.1X2APoisoning by iminostilbenes, intentional self-harm, initial encounter
T42.1X2DPoisoning by iminostilbenes, intentional self-harm, subsequent encounter
T42.1X2SPoisoning by iminostilbenes, intentional self-harm, sequela
T42.1X3APoisoning by iminostilbenes, assault, initial encounter
T42.1X3DPoisoning by iminostilbenes, assault, subsequent encounter
T42.1X3SPoisoning by iminostilbenes, assault, sequela
T42.1X4APoisoning by iminostilbenes, undetermined, initial encounter
T42.1X4DPoisoning by iminostilbenes, undetermined, subsequent encounter
T42.1X4SPoisoning by iminostilbenes, undetermined, sequela
T42.1X5AAdverse effect of iminostilbenes, initial encounter
T42.1X5DAdverse effect of iminostilbenes, subsequent encounter
T42.1X5SAdverse effect of iminostilbenes, sequela
T42.1X6AUnderdosing of iminostilbenes, initial encounter
T42.1X6DUnderdosing of iminostilbenes, subsequent encounter
T42.1X6SUnderdosing of iminostilbenes, sequela
T42.2X1APoisoning by succinimides and oxazolidinediones, accidental (unintentional), initial encounter
T42.2X1DPoisoning by succinimides and oxazolidinediones, accidental (unintentional), subsequent encounter
T42.2X1SPoisoning by succinimides and oxazolidinediones, accidental (unintentional), sequela
T42.2X2APoisoning by succinimides and oxazolidinediones, intentional self-harm, initial encounter
T42.2X2DPoisoning by succinimides and oxazolidinediones, intentional self-harm, subsequent encounter
T42.2X2SPoisoning by succinimides and oxazolidinediones, intentional self-harm, sequela
T42.2X3APoisoning by succinimides and oxazolidinediones, assault, initial encounter
T42.2X3DPoisoning by succinimides and oxazolidinediones, assault, subsequent encounter
T42.2X3SPoisoning by succinimides and oxazolidinediones, assault, sequela
T42.2X4APoisoning by succinimides and oxazolidinediones, undetermined, initial encounter
T42.2X4DPoisoning by succinimides and oxazolidinediones, undetermined, subsequent encounter
T42.2X4SPoisoning by succinimides and oxazolidinediones, undetermined, sequela
T42.2X5AAdverse effect of succinimides and oxazolidinediones, initial encounter
T42.2X5DAdverse effect of succinimides and oxazolidinediones, subsequent encounter
T42.2X5SAdverse effect of succinimides and oxazolidinediones, sequela
T42.2X6AUnderdosing of succinimides and oxazolidinediones, initial encounter
T42.2X6DUnderdosing of succinimides and oxazolidinediones, subsequent encounter
T42.2X6SUnderdosing of succinimides and oxazolidinediones, sequela
T42.3X1APoisoning by barbiturates, accidental (unintentional), initial encounter
T42.3X1DPoisoning by barbiturates, accidental (unintentional), subsequent encounter
T42.3X1SPoisoning by barbiturates, accidental (unintentional), sequela
T42.3X2APoisoning by barbiturates, intentional self-harm, initial encounter
T42.3X2DPoisoning by barbiturates, intentional self-harm, subsequent encounter
T42.3X2SPoisoning by barbiturates, intentional self-harm, sequela
T42.3X3APoisoning by barbiturates, assault, initial encounter
T42.3X3DPoisoning by barbiturates, assault, subsequent encounter
T42.3X3SPoisoning by barbiturates, assault, sequela
T42.3X4APoisoning by barbiturates, undetermined, initial encounter
T42.3X4DPoisoning by barbiturates, undetermined, subsequent encounter
T42.3X4SPoisoning by barbiturates, undetermined, sequela
T42.3X5AAdverse effect of barbiturates, initial encounter
T42.3X5DAdverse effect of barbiturates, subsequent encounter
T42.3X5SAdverse effect of barbiturates, sequela
T42.3X6AUnderdosing of barbiturates, initial encounter
T42.3X6DUnderdosing of barbiturates, subsequent encounter
T42.3X6SUnderdosing of barbiturates, sequela
T42.4X1APoisoning by benzodiazepines, accidental (unintentional), initial encounter
T42.4X1DPoisoning by benzodiazepines, accidental (unintentional), subsequent encounter
T42.4X1SPoisoning by benzodiazepines, accidental (unintentional), sequela
T42.4X2APoisoning by benzodiazepines, intentional self-harm, initial encounter
T42.4X2DPoisoning by benzodiazepines, intentional self-harm, subsequent encounter
T42.4X2SPoisoning by benzodiazepines, intentional self-harm, sequela
T42.4X3APoisoning by benzodiazepines, assault, initial encounter
T42.4X3DPoisoning by benzodiazepines, assault, subsequent encounter
T42.4X3SPoisoning by benzodiazepines, assault, sequela
T42.4X4APoisoning by benzodiazepines, undetermined, initial encounter
T42.4X4DPoisoning by benzodiazepines, undetermined, subsequent encounter
T42.4X4SPoisoning by benzodiazepines, undetermined, sequela
T42.4X5AAdverse effect of benzodiazepines, initial encounter
T42.4X5DAdverse effect of benzodiazepines, subsequent encounter
T42.4X5SAdverse effect of benzodiazepines, sequela
T42.4X6AUnderdosing of benzodiazepines, initial encounter
T42.4X6DUnderdosing of benzodiazepines, subsequent encounter
T42.4X6SUnderdosing of benzodiazepines, sequela
T42.5X1APoisoning by mixed antiepileptics, accidental (unintentional), initial encounter
T42.5X1DPoisoning by mixed antiepileptics, accidental (unintentional), subsequent encounter
T42.5X1SPoisoning by mixed antiepileptics, accidental (unintentional), sequela
T42.5X2APoisoning by mixed antiepileptics, intentional self-harm, initial encounter
T42.5X2DPoisoning by mixed antiepileptics, intentional self-harm, subsequent encounter
T42.5X2SPoisoning by mixed antiepileptics, intentional self-harm, sequela
T42.5X3APoisoning by mixed antiepileptics, assault, initial encounter
T42.5X3DPoisoning by mixed antiepileptics, assault, subsequent encounter
T42.5X3SPoisoning by mixed antiepileptics, assault, sequela
T42.5X4APoisoning by mixed antiepileptics, undetermined, initial encounter
T42.5X4DPoisoning by mixed antiepileptics, undetermined, subsequent encounter
T42.5X4SPoisoning by mixed antiepileptics, undetermined, sequela
T42.5X5AAdverse effect of mixed antiepileptics, initial encounter
T42.5X5DAdverse effect of mixed antiepileptics, subsequent encounter
T42.5X5SAdverse effect of mixed antiepileptics, sequela
T42.5X6AUnderdosing of mixed antiepileptics, initial encounter
T42.5X6DUnderdosing of mixed antiepileptics, subsequent encounter
T42.5X6SUnderdosing of mixed antiepileptics, sequela
T42.6X1APoisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional), initial encounter
T42.6X1DPoisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional), subsequent encounter
T42.6X1SPoisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional), sequela
T42.6X2APoisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm, initial encounter
T42.6X2DPoisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm, subsequent encounter
T42.6X2SPoisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm, sequela
T42.6X3APoisoning by other antiepileptic and sedative-hypnotic drugs, assault, initial encounter
T42.6X3DPoisoning by other antiepileptic and sedative-hypnotic drugs, assault, subsequent encounter
T42.6X3SPoisoning by other antiepileptic and sedative-hypnotic drugs, assault, sequela
T42.6X4APoisoning by other antiepileptic and sedative-hypnotic drugs, undetermined, initial encounter
T42.6X4DPoisoning by other antiepileptic and sedative-hypnotic drugs, undetermined, subsequent encounter
T42.6X4SPoisoning by other antiepileptic and sedative-hypnotic drugs, undetermined, sequela
T42.6X5AAdverse effect of other antiepileptic and sedative-hypnotic drugs, initial encounter
T42.6X5DAdverse effect of other antiepileptic and sedative-hypnotic drugs, subsequent encounter
T42.6X5SAdverse effect of other antiepileptic and sedative-hypnotic drugs, sequela
T42.6X6AUnderdosing of other antiepileptic and sedative-hypnotic drugs, initial encounter
T42.6X6DUnderdosing of other antiepileptic and sedative-hypnotic drugs, subsequent encounter
T42.6X6SUnderdosing of other antiepileptic and sedative-hypnotic drugs, sequela
T42.71XAPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional), initial encounter
T42.71XDPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional), subsequent encounter
T42.71XSPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional), sequela
T42.72XAPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm, initial encounter
T42.72XDPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm, subsequent encounter
T42.72XSPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm, sequela
T42.73XAPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault, initial encounter
T42.73XDPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault, subsequent encounter
T42.73XSPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault, sequela
T42.74XAPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined, initial encounter
T42.74XDPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined, subsequent encounter
T42.74XSPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined, sequela
T42.75XAAdverse effect of unspecified antiepileptic and sedative-hypnotic drugs, initial encounter
T42.75XDAdverse effect of unspecified antiepileptic and sedative-hypnotic drugs, subsequent encounter
T42.75XSAdverse effect of unspecified antiepileptic and sedative-hypnotic drugs, sequela
T42.76XAUnderdosing of unspecified antiepileptic and sedative-hypnotic drugs, initial encounter
T42.76XDUnderdosing of unspecified antiepileptic and sedative-hypnotic drugs, subsequent encounter
T42.76XSUnderdosing of unspecified antiepileptic and sedative-hypnotic drugs, sequela
T42.8X1APoisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional), initial encounter
T42.8X1DPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional), subsequent encounter
T42.8X1SPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional), sequela
T42.8X2APoisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm, initial encounter
T42.8X2DPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm, subsequent encounter
T42.8X2SPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm, sequela
T42.8X3APoisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault, initial encounter
T42.8X3DPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault, subsequent encounter
T42.8X3SPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault, sequela
T42.8X4APoisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined, initial encounter
T42.8X4DPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined, subsequent encounter
T42.8X4SPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined, sequela
T42.8X5AAdverse effect of antiparkinsonism drugs and other central muscle-tone depressants, initial encounter
T42.8X5DAdverse effect of antiparkinsonism drugs and other central muscle-tone depressants, subsequent encounter
T42.8X5SAdverse effect of antiparkinsonism drugs and other central muscle-tone depressants, sequela
T42.8X6AUnderdosing of antiparkinsonism drugs and other central muscle-tone depressants, initial encounter
T42.8X6DUnderdosing of antiparkinsonism drugs and other central muscle-tone depressants, subsequent encounter
T42.8X6SUnderdosing of antiparkinsonism drugs and other central muscle-tone depressants, sequela

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