Is T42 a billable code?
No. T42 is a header code that groups 144 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
T42: Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
T42 groups related diagnoses under poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under T42
- 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
- T42.8X1APoisoning 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
T42 questions
What does T42 mean?
T42 is the ICD-10-CM code for Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs. It is in chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.