T42 is a non-billable/non-specific diagnosis code from the 2025 ICD-10-CM used to classify the following condition: Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs.
Type 2 excludes
Drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)
Seventh character note
The appropriate 7th character is to be added to each code from category T42
Seventh character extensions
A: initial encounter
D: subsequent encounter
S: sequela
Codes
T42.0
Poisoning by, adverse effect of and underdosing of hydantoin derivatives
T42.1
Poisoning by, adverse effect of and underdosing of iminostilbenes
T42.2
Poisoning by, adverse effect of and underdosing of succinimides and oxazolidinediones
T42.3
Poisoning by, adverse effect of and underdosing of barbiturates
T42.4
Poisoning by, adverse effect of and underdosing of benzodiazepines
T42.5
Poisoning by, adverse effect of and underdosing of mixed antiepileptics
T42.6
Poisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugs
T42.7
Poisoning by, adverse effect of and underdosing of unspecified antiepileptic and sedative-hypnotic drugs
T42.8
Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressants
Versions
2025
No changes
2024
No changes
2023
No changes
2022
No changes
2021
No changes
2020
No changes
2019
No changes
2018
No changes
2017
No changes
2016
New code