T42 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs.
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Drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)
The appropriate 7th character is to be added to each code from category T42
A: initial encounter
D: subsequent encounter
S: sequela
Poisoning by, adverse effect of and underdosing of hydantoin derivatives
Poisoning by, adverse effect of and underdosing of iminostilbenes
Poisoning by, adverse effect of and underdosing of succinimides and oxazolidinediones
Poisoning by, adverse effect of and underdosing of barbiturates
Poisoning by, adverse effect of and underdosing of benzodiazepines
Poisoning by, adverse effect of and underdosing of mixed antiepileptics
Poisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugs
Poisoning by, adverse effect of and underdosing of unspecified antiepileptic and sedative-hypnotic drugs
Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressants
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