T40 ICD-10-CM Code: Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
T40Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]
ICD-10-CM diagnosis code · United States clinical modification
Where T40 sits
- 1
Chapter 19
Injury, poisoning and certain other consequences of external causes (S00-T88)
- 2
Section
Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)
- 3
Category T40
Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]
- 4
Code T40
Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]
Codes under T40
T40 is a non-billable category. Choose the child code that best matches the documented diagnosis.
T40.0Poisoning by, adverse effect of and underdosing of opiumT40.1Poisoning by and adverse effect of heroinT40.2Poisoning by, adverse effect of and underdosing of other opioidsT40.3Poisoning by, adverse effect of and underdosing of methadoneT40.4Poisoning by, adverse effect of and underdosing of other synthetic narcoticsT40.5Poisoning by, adverse effect of and underdosing of cocaineT40.6Poisoning by, adverse effect of and underdosing of other and unspecified narcoticsT40.7Poisoning by, adverse effect of and underdosing of cannabis (derivatives)T40.8Poisoning by and adverse effect of lysergide [LSD]T40.9Poisoning by, adverse effect of and underdosing of other and unspecified psychodysleptics [hallucinogens]Notes for this code
Inclusion terms
No inclusion terms are listed for T40.
Code first
No “code first” instruction is listed for T40.
Use additional code
No “use additional code” instruction is listed for T40.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for T40.
Excludes2
Conditions not included here that may be reported separately when present.
- drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.-F19.-)
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code T40 mean?
T40 is the FY 2027 U.S. ICD-10-CM code for “Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens].”
Is T40 a billable or specific ICD-10-CM code?
No. T40 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is T40 located in ICD-10-CM?
T40 is listed in Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88), within Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50) (T36–T50), under category T40, Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens].
What coding notes are listed for T40?
No inclusion terms are listed for T40 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.-F19.-).