T40 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 narcotics and psychodysleptics [hallucinogens].
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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 T40
A: initial encounter
D: subsequent encounter
S: sequela
Poisoning by, adverse effect of and underdosing of opium
Poisoning by and adverse effect of heroin
Poisoning by, adverse effect of and underdosing of other opioids
Poisoning by, adverse effect of and underdosing of methadone
Poisoning by, adverse effect of and underdosing of other synthetic narcotics
Poisoning by, adverse effect of and underdosing of cocaine
Poisoning by, adverse effect of and underdosing of other and unspecified narcotics
Poisoning by, adverse effect of and underdosing of cannabis (derivatives)
Poisoning by and adverse effect of lysergide [LSD]
Poisoning by, adverse effect of and underdosing of other and unspecified psychodysleptics [hallucinogens]
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