ICD-10-CM T42: Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs

ICD-10-CM Diagnosis Code (2025)

Official Description for T42

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

Coding Notes & Guidelines for T42

Excludes1: Not Coded Here

poisoning by, adverse effect of and underdosing of thiobarbiturates (T41.1-)

Excludes1: Not Coded Here

poisoning by, adverse effect of and underdosing of carbamazepine (T42.1-)

Excludes2: Not Included Here

drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)

Inclusion Terms

Poisoning by hydantoin derivatives NOS

Inclusion Terms

Poisoning by, adverse effect of and underdosing of carbamazepine

Inclusion Terms

Poisoning by iminostilbenes NOS

Inclusion Terms

Poisoning by succinimides and oxazolidinediones NOS

Inclusion Terms

Poisoning by barbiturates NOS

Inclusion Terms

Poisoning by benzodiazepines NOS

Inclusion Terms

Poisoning by mixed antiepileptics NOS

Inclusion Terms
  • Poisoning by, adverse effect of and underdosing of methaqualone
  • Poisoning by, adverse effect of and underdosing of valproic acid
Inclusion Terms

Poisoning by other antiepileptic and sedative-hypnotic drugs NOS

Inclusion Terms

Poisoning by antiepileptic and sedative-hypnotic drugs NOS

Inclusion Terms

Poisoning by, adverse effect of and underdosing of amantadine

Inclusion Terms

Poisoning by antiparkinsonism drugs and other central muscle-tone depressants NOS

7th Character Guidance

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

7th Character Definitions
  • A: initial encounter
  • D: subsequent encounter
  • S: sequela

Child Codes (More Specific Codes for T42):

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) T42.0X2 - Poisoning by hydantoin derivatives, intentional self-harm T42.0X3 - Poisoning by hydantoin derivatives, assault T42.0X4 - Poisoning by hydantoin derivatives, undetermined T42.0X5 - Adverse effect of hydantoin derivatives T42.0X6 - Underdosing of hydantoin derivatives 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) T42.1X2 - Poisoning by iminostilbenes, intentional self-harm T42.1X3 - Poisoning by iminostilbenes, assault T42.1X4 - Poisoning by iminostilbenes, undetermined T42.1X5 - Adverse effect of iminostilbenes T42.1X6 - Underdosing of iminostilbenes 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) T42.2X2 - Poisoning by succinimides and oxazolidinediones, intentional self-harm T42.2X3 - Poisoning by succinimides and oxazolidinediones, assault T42.2X4 - Poisoning by succinimides and oxazolidinediones, undetermined T42.2X5 - Adverse effect of succinimides and oxazolidinediones T42.2X6 - Underdosing of succinimides and oxazolidinediones 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) T42.3X2 - Poisoning by barbiturates, intentional self-harm T42.3X3 - Poisoning by barbiturates, assault T42.3X4 - Poisoning by barbiturates, undetermined T42.3X5 - Adverse effect of barbiturates T42.3X6 - Underdosing of barbiturates 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) T42.4X2 - Poisoning by benzodiazepines, intentional self-harm T42.4X3 - Poisoning by benzodiazepines, assault T42.4X4 - Poisoning by benzodiazepines, undetermined T42.4X5 - Adverse effect of benzodiazepines T42.4X6 - Underdosing of benzodiazepines 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) T42.5X2 - Poisoning by mixed antiepileptics, intentional self-harm T42.5X3 - Poisoning by mixed antiepileptics, assault T42.5X4 - Poisoning by mixed antiepileptics, undetermined T42.5X5 - Adverse effect of mixed antiepileptics T42.5X6 - Underdosing of mixed antiepileptics 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) T42.6X2 - Poisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm T42.6X3 - Poisoning by other antiepileptic and sedative-hypnotic drugs, assault T42.6X4 - Poisoning by other antiepileptic and sedative-hypnotic drugs, undetermined T42.6X5 - Adverse effect of other antiepileptic and sedative-hypnotic drugs T42.6X6 - Underdosing of other antiepileptic and sedative-hypnotic drugs 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) T42.72 - Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm T42.73 - Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault T42.74 - Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined T42.75 - Adverse effect of unspecified antiepileptic and sedative-hypnotic drugs T42.76 - Underdosing of unspecified antiepileptic and sedative-hypnotic drugs 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) T42.8X2 - Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm T42.8X3 - Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault T42.8X4 - Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined T42.8X5 - Adverse effect of antiparkinsonism drugs and other central muscle-tone depressants T42.8X6 - Underdosing of antiparkinsonism drugs and other central muscle-tone depressants

About ICD-10-CM Code T42 (Poisoning by)

ICD-10-CM code T42 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM T42 became effective on October 1, 2024.

This page provides detailed information about T42 - Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Poisoning by related to adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs.