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
drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.-F19.-)
Poisoning by opium NOS
Poisoning by heroin NOS
Poisoning by other opioids NOS
Poisoning by methadone NOS
Poisoning by other synthetic narcotics NOS
Poisoning by cocaine NOS
Poisoning by narcotics NOS
Poisoning by other narcotics NOS
Poisoning by lysergide [LSD] NOS
Poisoning by other psychodysleptics [hallucinogens] NOS
The appropriate 7th character is to be added to each code from category T40
- A: initial encounter
- D: subsequent encounter
- S: sequela
Child Codes (More Specific Codes for T40):
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].