Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs (T42)

Browse all the diagnosis codes used for poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs (t42). For easy navigation, the diagnosis codes are sorted in alphabetical order and grouped by sections. Each section is clearly marked with its description, and the corresponding three-digit code range. This format makes it simple to browse diagnosis codes in this chapter or section and find what you're looking for. We've also added green checkmark icons to label billable codes, and red warning icons for non-billable ones. This makes it easy to identify which codes can be billed.

Clinical Information

Barbiturates - A class of chemicals derived from barbituric acid or thiobarbituric acid. Many of these are GABA MODULATORS used as HYPNOTICS AND SEDATIVES, as ANESTHETICS, or as ANTICONVULSANTS.

Benzodiazepines - A group of two-ring heterocyclic compounds consisting of a benzene ring fused to a diazepine ring.

Instructional Notations

Type 2 Excludes

A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

  • drug dependence and related mental and behavioral disorders due to psychoactive substance use F10 F19

7th Character Note

Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.

  • The appropriate 7th character is to be added to each code from category T42

7th Character

Indicates that a seventh character is to be assigned to codes in a subcategory.

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela
  • Injury, poisoning and certain other consequences of external causes (S00–T88)

    • Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances (T36-T50)

        • Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs (T42)

        • T42 Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs
        • T42.0 Poisoning by, adverse effect of and underdosing of hydantoin derivatives
        • T42.0X Poisoning by, adverse effect of and underdosing of hydantoin derivatives
        • T42.0X1 Poisoning by hydantoin derivatives, accidental (unintentional)
        • T42.0X1A Poisoning by hydantoin derivatives, accidental (unintentional), initial encounter
        • T42.0X1D Poisoning by hydantoin derivatives, accidental (unintentional), subsequent encounter
        • T42.0X1S Poisoning by hydantoin derivatives, accidental (unintentional), sequela
        • T42.0X2 Poisoning by hydantoin derivatives, intentional self-harm
        • T42.0X2A Poisoning by hydantoin derivatives, intentional self-harm, initial encounter
        • T42.0X2D Poisoning by hydantoin derivatives, intentional self-harm, subsequent encounter
        • T42.0X2S Poisoning by hydantoin derivatives, intentional self-harm, sequela
        • T42.0X3 Poisoning by hydantoin derivatives, assault
        • T42.0X3A Poisoning by hydantoin derivatives, assault, initial encounter
        • T42.0X3D Poisoning by hydantoin derivatives, assault, subsequent encounter
        • T42.0X3S Poisoning by hydantoin derivatives, assault, sequela
        • T42.0X4 Poisoning by hydantoin derivatives, undetermined
        • T42.0X4A Poisoning by hydantoin derivatives, undetermined, initial encounter
        • T42.0X4D Poisoning by hydantoin derivatives, undetermined, subsequent encounter
        • T42.0X4S Poisoning by hydantoin derivatives, undetermined, sequela
        • T42.0X5 Adverse effect of hydantoin derivatives
        • T42.0X5A Adverse effect of hydantoin derivatives, initial encounter
        • T42.0X5D Adverse effect of hydantoin derivatives, subsequent encounter
        • T42.0X5S Adverse effect of hydantoin derivatives, sequela
        • T42.0X6 Underdosing of hydantoin derivatives
        • T42.0X6A Underdosing of hydantoin derivatives, initial encounter
        • T42.0X6D Underdosing of hydantoin derivatives, subsequent encounter
        • T42.0X6S Underdosing of hydantoin derivatives, sequela
        • T42.1 Poisoning by, adverse effect of and underdosing of iminostilbenes
        • T42.1X Poisoning by, adverse effect of and underdosing of iminostilbenes
        • T42.1X1 Poisoning by iminostilbenes, accidental (unintentional)
        • T42.1X1A Poisoning by iminostilbenes, accidental (unintentional), initial encounter
        • T42.1X1D Poisoning by iminostilbenes, accidental (unintentional), subsequent encounter
        • T42.1X1S Poisoning by iminostilbenes, accidental (unintentional), sequela
        • T42.1X2 Poisoning by iminostilbenes, intentional self-harm
        • T42.1X2A Poisoning by iminostilbenes, intentional self-harm, initial encounter
        • T42.1X2D Poisoning by iminostilbenes, intentional self-harm, subsequent encounter
        • T42.1X2S Poisoning by iminostilbenes, intentional self-harm, sequela
        • T42.1X3 Poisoning by iminostilbenes, assault
        • T42.1X3A Poisoning by iminostilbenes, assault, initial encounter
        • T42.1X3D Poisoning by iminostilbenes, assault, subsequent encounter
        • T42.1X3S Poisoning by iminostilbenes, assault, sequela
        • T42.1X4 Poisoning by iminostilbenes, undetermined
        • T42.1X4A Poisoning by iminostilbenes, undetermined, initial encounter
        • T42.1X4D Poisoning by iminostilbenes, undetermined, subsequent encounter
        • T42.1X4S Poisoning by iminostilbenes, undetermined, sequela
        • T42.1X5 Adverse effect of iminostilbenes
        • T42.1X5A Adverse effect of iminostilbenes, initial encounter
        • T42.1X5D Adverse effect of iminostilbenes, subsequent encounter
        • T42.1X5S Adverse effect of iminostilbenes, sequela
        • T42.1X6 Underdosing of iminostilbenes
        • T42.1X6A Underdosing of iminostilbenes, initial encounter
        • T42.1X6D Underdosing of iminostilbenes, subsequent encounter
        • T42.1X6S Underdosing of iminostilbenes, sequela
        • T42.2 Poisoning by, adverse effect of and underdosing of succinimides and oxazolidinediones
        • T42.2X Poisoning by, adverse effect of and underdosing of succinimides and oxazolidinediones
        • T42.2X1 Poisoning by succinimides and oxazolidinediones, accidental (unintentional)
        • T42.2X1A Poisoning by succinimides and oxazolidinediones, accidental (unintentional), initial encounter
        • T42.2X1D Poisoning by succinimides and oxazolidinediones, accidental (unintentional), subsequent encounter
        • T42.2X1S Poisoning by succinimides and oxazolidinediones, accidental (unintentional), sequela
        • T42.2X2 Poisoning by succinimides and oxazolidinediones, intentional self-harm
        • T42.2X2A Poisoning by succinimides and oxazolidinediones, intentional self-harm, initial encounter
        • T42.2X2D Poisoning by succinimides and oxazolidinediones, intentional self-harm, subsequent encounter
        • T42.2X2S Poisoning by succinimides and oxazolidinediones, intentional self-harm, sequela
        • T42.2X3 Poisoning by succinimides and oxazolidinediones, assault
        • T42.2X3A Poisoning by succinimides and oxazolidinediones, assault, initial encounter
        • T42.2X3D Poisoning by succinimides and oxazolidinediones, assault, subsequent encounter
        • T42.2X3S Poisoning by succinimides and oxazolidinediones, assault, sequela
        • T42.2X4 Poisoning by succinimides and oxazolidinediones, undetermined
        • T42.2X4A Poisoning by succinimides and oxazolidinediones, undetermined, initial encounter
        • T42.2X4D Poisoning by succinimides and oxazolidinediones, undetermined, subsequent encounter
        • T42.2X4S Poisoning by succinimides and oxazolidinediones, undetermined, sequela
        • T42.2X5 Adverse effect of succinimides and oxazolidinediones
        • T42.2X5A Adverse effect of succinimides and oxazolidinediones, initial encounter
        • T42.2X5D Adverse effect of succinimides and oxazolidinediones, subsequent encounter
        • T42.2X5S Adverse effect of succinimides and oxazolidinediones, sequela
        • 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
        • T42.4X5D Adverse effect of benzodiazepines, subsequent encounter
        • T42.4X5S Adverse effect of benzodiazepines, sequela
        • T42.4X6 Underdosing of benzodiazepines
        • T42.4X6A Underdosing of benzodiazepines, initial encounter
        • T42.4X6D Underdosing of benzodiazepines, subsequent encounter
        • T42.4X6S Underdosing of benzodiazepines, sequela
        • T42.5 Poisoning by, adverse effect of and underdosing of mixed antiepileptics
        • T42.5X Poisoning by, adverse effect of and underdosing of antiepileptics
        • T42.5X1 Poisoning by mixed antiepileptics, accidental (unintentional)
        • T42.5X1A Poisoning by mixed antiepileptics, accidental (unintentional), initial encounter
        • T42.5X1D Poisoning by mixed antiepileptics, accidental (unintentional), subsequent encounter
        • T42.5X1S Poisoning by mixed antiepileptics, accidental (unintentional), sequela
        • T42.5X2 Poisoning by mixed antiepileptics, intentional self-harm
        • T42.5X2A Poisoning by mixed antiepileptics, intentional self-harm, initial encounter
        • T42.5X2D Poisoning by mixed antiepileptics, intentional self-harm, subsequent encounter
        • T42.5X2S Poisoning by mixed antiepileptics, intentional self-harm, sequela
        • T42.5X3 Poisoning by mixed antiepileptics, assault
        • T42.5X3A Poisoning by mixed antiepileptics, assault, initial encounter
        • T42.5X3D Poisoning by mixed antiepileptics, assault, subsequent encounter
        • T42.5X3S Poisoning by mixed antiepileptics, assault, sequela
        • T42.5X4 Poisoning by mixed antiepileptics, undetermined
        • T42.5X4A Poisoning by mixed antiepileptics, undetermined, initial encounter
        • T42.5X4D Poisoning by mixed antiepileptics, undetermined, subsequent encounter
        • T42.5X4S Poisoning by mixed antiepileptics, undetermined, sequela
        • T42.5X5 Adverse effect of mixed antiepileptics
        • T42.5X5A Adverse effect of mixed antiepileptics, initial encounter
        • T42.5X5D Adverse effect of mixed antiepileptics, subsequent encounter
        • T42.5X5S Adverse effect of mixed antiepileptics, sequela
        • T42.5X6 Underdosing of mixed antiepileptics
        • T42.5X6A Underdosing of mixed antiepileptics, initial encounter
        • T42.5X6D Underdosing of mixed antiepileptics, subsequent encounter
        • T42.5X6S Underdosing of mixed antiepileptics, sequela
        • T42.6 Poisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugs
        • T42.6X Poisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugs
        • T42.6X1 Poisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional)
        • T42.6X1A Poisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional), initial encounter
        • T42.6X1D Poisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional), subsequent encounter
        • T42.6X1S Poisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional), sequela
        • T42.6X2 Poisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm
        • T42.6X2A Poisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm, initial encounter
        • T42.6X2D Poisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm, subsequent encounter
        • T42.6X2S Poisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm, sequela
        • T42.6X3 Poisoning by other antiepileptic and sedative-hypnotic drugs, assault
        • T42.6X3A Poisoning by other antiepileptic and sedative-hypnotic drugs, assault, initial encounter
        • T42.6X3D Poisoning by other antiepileptic and sedative-hypnotic drugs, assault, subsequent encounter
        • T42.6X3S Poisoning by other antiepileptic and sedative-hypnotic drugs, assault, sequela
        • T42.6X4 Poisoning by other antiepileptic and sedative-hypnotic drugs, undetermined
        • T42.6X4A Poisoning by other antiepileptic and sedative-hypnotic drugs, undetermined, initial encounter
        • T42.6X4D Poisoning by other antiepileptic and sedative-hypnotic drugs, undetermined, subsequent encounter
        • T42.6X4S Poisoning by other antiepileptic and sedative-hypnotic drugs, undetermined, sequela
        • T42.6X5 Adverse effect of other antiepileptic and sedative-hypnotic drugs
        • T42.6X5A Adverse effect of other antiepileptic and sedative-hypnotic drugs, initial encounter
        • T42.6X5D Adverse effect of other antiepileptic and sedative-hypnotic drugs, subsequent encounter
        • T42.6X5S Adverse effect of other antiepileptic and sedative-hypnotic drugs, sequela
        • T42.6X6 Underdosing of other antiepileptic and sedative-hypnotic drugs
        • T42.6X6A Underdosing of other antiepileptic and sedative-hypnotic drugs, initial encounter
        • T42.6X6D Underdosing of other antiepileptic and sedative-hypnotic drugs, subsequent encounter
        • T42.6X6S Underdosing of other antiepileptic and sedative-hypnotic drugs, sequela
        • T42.7 Poisoning by, adverse effect of and underdosing of unspecified antiepileptic and sedative-hypnotic drugs
        • T42.71 Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional)
        • T42.71XA Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional), initial encounter
        • T42.71XD Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional), subsequent encounter
        • T42.71XS Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional), sequela
        • T42.72 Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm
        • T42.72XA Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm, initial encounter
        • T42.72XD Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm, subsequent encounter
        • T42.72XS Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm, sequela
        • T42.73 Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault
        • T42.73XA Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault, initial encounter
        • T42.73XD Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault, subsequent encounter
        • T42.73XS Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault, sequela
        • T42.74 Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined
        • T42.74XA Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined, initial encounter
        • T42.74XD Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined, subsequent encounter
        • T42.74XS Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined, sequela
        • T42.75 Adverse effect of unspecified antiepileptic and sedative-hypnotic drugs
        • T42.75XA Adverse effect of unspecified antiepileptic and sedative-hypnotic drugs, initial encounter
        • T42.75XD Adverse effect of unspecified antiepileptic and sedative-hypnotic drugs, subsequent encounter
        • T42.75XS Adverse effect of unspecified antiepileptic and sedative-hypnotic drugs, sequela
        • T42.76 Underdosing of unspecified antiepileptic and sedative-hypnotic drugs
        • T42.76XA Underdosing of unspecified antiepileptic and sedative-hypnotic drugs, initial encounter
        • T42.76XD Underdosing of unspecified antiepileptic and sedative-hypnotic drugs, subsequent encounter
        • T42.76XS Underdosing of unspecified antiepileptic and sedative-hypnotic drugs, sequela
        • T42.8 Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressants
        • T42.8X Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressants
        • T42.8X1 Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional)
        • T42.8X1A Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional), initial encounter
        • T42.8X1D Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional), subsequent encounter
        • T42.8X1S Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional), sequela
        • T42.8X2 Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm
        • T42.8X2A Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm, initial encounter
        • T42.8X2D Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm, subsequent encounter
        • T42.8X2S Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm, sequela
        • T42.8X3 Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault
        • T42.8X3A Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault, initial encounter
        • T42.8X3D Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault, subsequent encounter
        • T42.8X3S Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault, sequela
        • T42.8X4 Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined
        • T42.8X4A Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined, initial encounter
        • T42.8X4D Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined, subsequent encounter
        • T42.8X4S Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined, sequela
        • T42.8X5 Adverse effect of antiparkinsonism drugs and other central muscle-tone depressants
        • T42.8X5A Adverse effect of antiparkinsonism drugs and other central muscle-tone depressants, initial encounter
        • T42.8X5D Adverse effect of antiparkinsonism drugs and other central muscle-tone depressants, subsequent encounter
        • T42.8X5S Adverse effect of antiparkinsonism drugs and other central muscle-tone depressants, sequela
        • T42.8X6 Underdosing of antiparkinsonism drugs and other central muscle-tone depressants
        • T42.8X6A Underdosing of antiparkinsonism drugs and other central muscle-tone depressants, initial encounter
        • T42.8X6D Underdosing of antiparkinsonism drugs and other central muscle-tone depressants, subsequent encounter
        • T42.8X6S Underdosing of antiparkinsonism drugs and other central muscle-tone depressants, sequela