All ICD10 Codes

T40

Non-Billable
ChapterS00–T88
Rankcategory
Official Description

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

Use a more specific code (0 billable, 10 non-billable)
T40.0Poisoning by, adverse effect of and underdosing of opiumhas subcodesT40.1Poisoning by and adverse effect of heroinhas subcodesT40.2Poisoning by, adverse effect of and underdosing of other opioidshas subcodesT40.3Poisoning by, adverse effect of and underdosing of methadonehas subcodesT40.4Poisoning by, adverse effect of and underdosing of other synthetic narcoticshas subcodesT40.5Poisoning by, adverse effect of and underdosing of cocainehas subcodesT40.6Poisoning by, adverse effect of and underdosing of other and unspecified narcoticshas subcodesT40.7Poisoning by, adverse effect of and underdosing of cannabis (derivatives)has subcodesT40.8Poisoning by and adverse effect of lysergide [LSD]has subcodesT40.9Poisoning by, adverse effect of and underdosing of other and unspecified psychodysleptics [hallucinogens]has subcodes
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88).

CH19 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
Use Additional Code
  • code to identify any retained foreign body, if applicable (Z18.-)

T36-T50 Parent Instructions

Includes
  • adverse effect of correct substance properly administered
  • poisoning by overdose of substance
  • poisoning by wrong substance given or taken in error
  • underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed
Excludes1(Not coded here. Use a different code.)
  • toxic reaction to local anesthesia in pregnancy (O29.3-)
Excludes2(Not included here. Code separately if applicable.)
  • abuse and dependence of psychoactive substances (F10-F19)
  • abuse of non-dependence-producing substances (F55.-)
  • immunodeficiency due to drugs (D84.821)
  • drug reaction and poisoning affecting newborn (P00-P96)
  • pathological drug intoxication (inebriation) (F10-F19)
Code First
  • , for adverse effects, the nature of the adverse effect, such as:
  • adverse effect NOS (T88.7)
  • aspirin gastritis (K29.-)
  • blood disorders (D56-D76)
  • contact dermatitis (L23-L25)
  • dermatitis due to substances taken internally (L27.-)
  • nephropathy (N14.0-N14.2)
Use Additional Code
  • code(s) to specify:
  • manifestations of poisoning
  • underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
  • underdosing of medication regimen (Z91.12-, Z91.13-)

Instructional Notes

Excludes2(Not included here. Code separately if applicable.)
  • drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.-F19.-)

Clinical Hierarchy

BillableHas subcodes
CH19Injury, poisoning and certain other consequences of external causes (S00-T88)
T36-T50Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)
T40Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]Not billable
T40.0Poisoning by, adverse effect of and underdosing of opiumSubcodes
T40.1Poisoning by and adverse effect of heroinSubcodes
T40.2Poisoning by, adverse effect of and underdosing of other opioidsSubcodes
T40.3Poisoning by, adverse effect of and underdosing of methadoneSubcodes
T40.4Poisoning by, adverse effect of and underdosing of other synthetic narcoticsSubcodes
T40.5Poisoning by, adverse effect of and underdosing of cocaineSubcodes
T40.6Poisoning by, adverse effect of and underdosing of other and unspecified narcoticsSubcodes
T40.7Poisoning by, adverse effect of and underdosing of cannabis (derivatives)Subcodes
T40.8Poisoning by and adverse effect of lysergide [LSD]Subcodes
T40.9Poisoning by, adverse effect of and underdosing of other and unspecified psychodysleptics [hallucinogens]Subcodes

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to T40:

blockT36-T50
Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)
View context instructions
chapterCH19
Injury, poisoning and certain other consequences of external causes (S00-T88)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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