ICD-10-CM T40: Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]

ICD-10-CM Diagnosis Code (2025)

Official Description for T40

Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]

Coding Notes & Guidelines for T40

Excludes2: Not Included Here

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

Inclusion Terms

Poisoning by opium NOS

Inclusion Terms

Poisoning by heroin NOS

Inclusion Terms

Poisoning by other opioids NOS

Inclusion Terms

Poisoning by methadone NOS

Inclusion Terms

Poisoning by other synthetic narcotics NOS

Inclusion Terms

Poisoning by cocaine NOS

Inclusion Terms

Poisoning by narcotics NOS

Inclusion Terms

Poisoning by other narcotics NOS

Inclusion Terms

Poisoning by lysergide [LSD] NOS

Inclusion Terms

Poisoning by other psychodysleptics [hallucinogens] NOS

7th Character Guidance

The appropriate 7th character is to be added to each code from category T40

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

Child Codes (More Specific Codes for T40):

T40.0 - Poisoning by, adverse effect of and underdosing of opium T40.0X - Poisoning by, adverse effect of and underdosing of opium T40.0X1 - Poisoning by opium, accidental (unintentional) T40.0X2 - Poisoning by opium, intentional self-harm T40.0X3 - Poisoning by opium, assault T40.0X4 - Poisoning by opium, undetermined T40.0X5 - Adverse effect of opium T40.0X6 - Underdosing of opium T40.1 - Poisoning by and adverse effect of heroin T40.1X - Poisoning by and adverse effect of heroin T40.1X1 - Poisoning by heroin, accidental (unintentional) T40.1X2 - Poisoning by heroin, intentional self-harm T40.1X3 - Poisoning by heroin, assault T40.1X4 - Poisoning by heroin, undetermined T40.2 - Poisoning by, adverse effect of and underdosing of other opioids T40.2X - Poisoning by, adverse effect of and underdosing of other opioids T40.2X1 - Poisoning by other opioids, accidental (unintentional) T40.2X2 - Poisoning by other opioids, intentional self-harm T40.2X3 - Poisoning by other opioids, assault T40.2X4 - Poisoning by other opioids, undetermined T40.2X5 - Adverse effect of other opioids T40.2X6 - Underdosing of other opioids T40.3 - Poisoning by, adverse effect of and underdosing of methadone T40.3X - Poisoning by, adverse effect of and underdosing of methadone T40.3X1 - Poisoning by methadone, accidental (unintentional) T40.3X2 - Poisoning by methadone, intentional self-harm T40.3X3 - Poisoning by methadone, assault T40.3X4 - Poisoning by methadone, undetermined T40.3X5 - Adverse effect of methadone T40.3X6 - Underdosing of methadone T40.4 - Poisoning by, adverse effect of and underdosing of other synthetic narcotics T40.41 - Poisoning by, adverse effect of and underdosing of fentanyl or fentanyl analogs T40.411 - Poisoning by fentanyl or fentanyl analogs, accidental (unintentional) T40.412 - Poisoning by fentanyl or fentanyl analogs, intentional self-harm T40.413 - Poisoning by fentanyl or fentanyl analogs, assault T40.414 - Poisoning by fentanyl or fentanyl analogs, undetermined T40.415 - Adverse effect of fentanyl or fentanyl analogs T40.416 - Underdosing of fentanyl or fentanyl analogs T40.42 - Poisoning by, adverse effect of and underdosing of tramadol T40.421 - Poisoning by tramadol, accidental (unintentional) T40.422 - Poisoning by tramadol, intentional self-harm T40.423 - Poisoning by tramadol, assault T40.424 - Poisoning by tramadol, undetermined T40.425 - Adverse effect of tramadol T40.426 - Underdosing of tramadol T40.49 - Poisoning by, adverse effect of and underdosing of other synthetic narcotics T40.491 - Poisoning by other synthetic narcotics, accidental (unintentional) T40.492 - Poisoning by other synthetic narcotics, intentional self-harm T40.493 - Poisoning by other synthetic narcotics, assault T40.494 - Poisoning by other synthetic narcotics, undetermined T40.495 - Adverse effect of other synthetic narcotics T40.496 - Underdosing of other synthetic narcotics T40.5 - Poisoning by, adverse effect of and underdosing of cocaine T40.5X - Poisoning by, adverse effect of and underdosing of cocaine T40.5X1 - Poisoning by cocaine, accidental (unintentional) T40.5X2 - Poisoning by cocaine, intentional self-harm T40.5X3 - Poisoning by cocaine, assault T40.5X4 - Poisoning by cocaine, undetermined T40.5X5 - Adverse effect of cocaine T40.5X6 - Underdosing of cocaine T40.6 - Poisoning by, adverse effect of and underdosing of other and unspecified narcotics T40.60 - Poisoning by, adverse effect of and underdosing of unspecified narcotics T40.601 - Poisoning by unspecified narcotics, accidental (unintentional) T40.602 - Poisoning by unspecified narcotics, intentional self-harm T40.603 - Poisoning by unspecified narcotics, assault T40.604 - Poisoning by unspecified narcotics, undetermined T40.605 - Adverse effect of unspecified narcotics T40.606 - Underdosing of unspecified narcotics T40.69 - Poisoning by, adverse effect of and underdosing of other narcotics T40.691 - Poisoning by other narcotics, accidental (unintentional) T40.692 - Poisoning by other narcotics, intentional self-harm T40.693 - Poisoning by other narcotics, assault T40.694 - Poisoning by other narcotics, undetermined T40.695 - Adverse effect of other narcotics T40.696 - Underdosing of other narcotics T40.7 - Poisoning by, adverse effect of and underdosing of cannabis (derivatives) T40.71 - Poisoning by, adverse effect of and underdosing of cannabis (derivatives) T40.711 - Poisoning by cannabis, accidental (unintentional) T40.712 - Poisoning by cannabis, intentional self-harm T40.713 - Poisoning by cannabis, assault T40.714 - Poisoning by cannabis, undetermined T40.715 - Adverse effect of cannabis T40.716 - Underdosing of cannabis T40.72 - Poisoning by, adverse effect of and underdosing of synthetic cannabinoids T40.721 - Poisoning by synthetic cannabinoids, accidental (unintentional) T40.722 - Poisoning by synthetic cannabinoids, intentional self-harm T40.723 - Poisoning by synthetic cannabinoids, assault T40.724 - Poisoning by synthetic cannabinoids, undetermined T40.725 - Adverse effect of synthetic cannabinoids T40.726 - Underdosing of synthetic cannabinoids T40.8 - Poisoning by and adverse effect of lysergide [LSD] T40.8X - Poisoning by and adverse effect of lysergide [LSD] T40.8X1 - Poisoning by lysergide [LSD], accidental (unintentional) T40.8X2 - Poisoning by lysergide [LSD], intentional self-harm T40.8X3 - Poisoning by lysergide [LSD], assault T40.8X4 - Poisoning by lysergide [LSD], undetermined T40.9 - Poisoning by, adverse effect of and underdosing of other and unspecified psychodysleptics [hallucinogens] T40.90 - Poisoning by, adverse effect of and underdosing of unspecified psychodysleptics [hallucinogens] T40.901 - Poisoning by unspecified psychodysleptics [hallucinogens], accidental (unintentional) T40.902 - Poisoning by unspecified psychodysleptics [hallucinogens], intentional self-harm T40.903 - Poisoning by unspecified psychodysleptics [hallucinogens], assault T40.904 - Poisoning by unspecified psychodysleptics [hallucinogens], undetermined T40.905 - Adverse effect of unspecified psychodysleptics [hallucinogens] T40.906 - Underdosing of unspecified psychodysleptics [hallucinogens] T40.99 - Poisoning by, adverse effect of and underdosing of other psychodysleptics [hallucinogens] T40.991 - Poisoning by other psychodysleptics [hallucinogens], accidental (unintentional) T40.992 - Poisoning by other psychodysleptics [hallucinogens], intentional self-harm T40.993 - Poisoning by other psychodysleptics [hallucinogens], assault T40.994 - Poisoning by other psychodysleptics [hallucinogens], undetermined T40.995 - Adverse effect of other psychodysleptics [hallucinogens] T40.996 - Underdosing of other psychodysleptics [hallucinogens]

About ICD-10-CM Code T40 (Poisoning by)

ICD-10-CM code T40 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 T40 became effective on October 1, 2024.

This page provides detailed information about T40 - Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]. 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 narcotics and psychodysleptics [hallucinogens].