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 45 Adverse effect of unspecified anesthetic
 * T41.46 Underdosing of unspecified anesthetics
 * T41.5 Poisoning by, adverse effect of and underdosing of therapeutic gases
 * T41.5x Poisoning by, adverse effect of and underdosing of therapeutic gases
 * T41.5x1 Poisoning by therapeutic gases, accidental (unintentional)
 * Poisoning by therapeutic gases NOS
 * T41.5x2 Poisoning by therapeutic gases, intentional self-harm
 * T41.5x3 Poisoning by therapeutic gases, assault
 * T41.5x4 Poisoning by therapeutic gases, undetermined
 * T41.5x5 Adverse effect of therapeutic gases
 * T41.5x6 Underdosing of therapeutic gases

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

 * Excludes2: 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
 * 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)
 * Poisoning by hydantoin derivatives NOS
 * 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
 * Poisoning by, adverse effect of and underdosing of carbamazepine
 * T42.1x Poisoning by, adverse effect of and underdosing of iminostilbenes
 * T42.