2027 ICD-10-CM Diagnosis Code T40.711APoisoning by cannabis, accidental (unintentional), initial encounter

ICD-10-CM Codes›S00–T88›T36-T50›T40

ICD-10-CM T40.711A
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

T40.711A is a billable ICD-10-CM diagnosis code for poisoning by cannabis, accidental (unintentional), initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 917 through 918. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cannabis-related disorders; External cause codes: intent of injury, accidental/unintentional; and External cause codes: poisoning by drug.

Code Identity

ICD-10-CM Code
T40.711A
Billable Status
Yes — Valid for Submission
Code Describes
Poisoning by cannabis, accidental (unintentional), initial encounter
Short Description
Poisoning by cannabis, accidental (unintentional), init
Parent Code
T40.711
Poisoning by cannabis, accidental (unintentional)

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT36-T50Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances
CategoryT40Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]
This CodeT40.711APoisoning by cannabis, accidental (unintentional), initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Accidental cannabis overdose
  • Accidental cannabis poisoning
  • Accidental nabilone overdose
  • Accidental nabilone poisoning
  • Accidental poisoning by hallucinogens
  • Accidental poisoning caused by cannabinoid receptor agonist
  • Cannabis intoxication
  • Cannabis overdose
  • Cannabis poisoning
  • Nabilone overdose
  • Nabilone poisoning
  • Poisoning caused by cannabinoid receptor agonist
  • Synthetic cannabinoid intoxication

Coding GuidelinesGuidance

When coding a poisoning or reaction to the improper use of a medication (e.g., overdose, wrong substance given or taken in error, wrong route of administration), first assign the appropriate code from categories T36-T50. The poisoning codes have an associated intent as their 5th or 6th character (accidental, intentional self-harm, assault and undetermined). If the intent of the poisoning is unknown or unspecified, code the intent as accidental intent. The undetermined intent is only for use if the documentation in the record specifies that the intent cannot be determined. Use additional code(s) for all manifestations of poisonings.

The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens] (T40). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to T40.711A: its own notes plus those printed at T40, block T36-T50, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block T36-T50 Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances applies to 3,186 codes
  • 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: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block T36-T50 Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances applies to 3,186 codes
  • toxic reaction to local anesthesia in pregnancy (O29.3-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From T40 Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens] applies to 258 codes
  • drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.-F19.-)
From Block T36-T50 Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances applies to 3,186 codes
  • 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)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Code First

The underlying condition named in the note is sequenced before this code.

From Block T36-T50 Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances applies to 3,186 codes
  • 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

Add a second code, after this one, to fully describe the condition.

From Block T36-T50 Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances applies to 3,186 codes
  • 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-)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Notes

General instructions on how these codes are used.

From Block T36-T50 Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances applies to 3,186 codes
  • The drug giving rise to the adverse effect should be identified by use of codes from categories T36-T50 with fifth or sixth character 5.
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From T40 Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens] applies to 258 codes
  • The appropriate 7th character is to be added to each code from category T40
Values for category T40 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter this code
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name T40.711A, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming T40.711A: its condition is not part of those codes, and both may be reported when the patient has both.

  • F12.2 Cannabis dependence
    cannabis poisoning (T40.7-) names T40.7-, which includes this code
  • T43 Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified
    psychodysleptics [hallucinogens] (T40.7-T40.9-) names T40.7-T40.9, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MBD019
Cannabis-related disorders
Default principal diagnosis: inpatient No · outpatient No
CCSR EXT020
External cause codes: intent of injury, accidental/unintentional
Default principal diagnosis: inpatient No · outpatient No
CCSR EXT014
External cause codes: poisoning by drug
Default principal diagnosis: inpatient No · outpatient No
CCSR INJ022
Poisoning by drugs, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Cannabinol

    a physiologically inactive constituent of cannabis sativa l.

  • Dronabinol

    a psychoactive compound extracted from the resin of cannabis sativa (marihuana, hashish). the isomer delta-9-tetrahydrocannabinol (thc) is considered the most active form, producing characteristic mood and perceptual changes associated with this compound.

Table of Drugs and ChemicalsClinical

Substances in the Table of Drugs and Chemicals that reference this code family. Always confirm in the Tabular List before coding.

SubstanceAccidentalSelf-harmAssaultUndeter­minedAdverse
Effect		Under­dosing
Afghanistan blackT40.711T40.712T40.713T40.714T40.715T40.716
Bhang+C394T40.711T40.712T40.713T40.714T40.715T40.716
CannabinolT40.711T40.712T40.713T40.714T40.715T40.716
Cannabis (derivatives)T40.711T40.712T40.713T40.714T40.715T40.716
Central nervous system::depressants::cannabis sativaT40.711T40.712T40.713T40.714T40.715T40.716
DronabinolT40.711T40.712T40.713T40.714T40.715T40.716
GanjaT40.711T40.712T40.713T40.714T40.715T40.716
HashishT40.711T40.712T40.713T40.714T40.715T40.716
Indian::hempT40.711T40.712T40.713T40.714T40.715T40.716
Lebanese redT40.711T40.712T40.713T40.714T40.715T40.716
MarihuanaT40.711T40.712T40.713T40.714T40.715T40.716
MarijuanaT40.711T40.712T40.713T40.714T40.715T40.716
NabiloneT40.711T40.712T40.713T40.714T40.715T40.716
PotT40.711T40.712T40.713T40.714T40.715T40.716
TetrahydrocannabinolT40.711T40.712T40.713T40.714T40.715T40.716
THCT40.711T40.712T40.713T40.714T40.715T40.716

Code History & ChangesHistory

Replacement T40.711A replaces the following previously assigned code(s):

  • T40.7X1A - Poisoning by cannabis (derivatives), accidental, init
FY 2022AddedAdded to the ICD-10-CM code setEffective October 1, 2021.
FY 2023–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About T40.711AOverview

What is the ICD-10 code for poisoning by cannabis, accidental (unintentional), initial encounter?

The ICD-10-CM code for poisoning by cannabis, accidental (unintentional), initial encounter is T40.711A (sometimes written as T40711A). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is T40.711A (Poisoning by cannabis, accidental (unintentional)) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report poisoning by cannabis, accidental (unintentional), initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character A in T40.711A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for poisoning by cannabis, accidental (unintentional), such as an emergency visit or first evaluation.

What MS-DRG does T40.711A group to?

When poisoning by cannabis, accidental (unintentional), initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 918, 917, with relative weights from 0.8716 to 1.5698 depending on complications. Higher weights mean higher Medicare reimbursement.

Can T40.711A be reported with a code from O29.3?

Not as a rule. The Excludes1 note at block T36-T50, which applies to T40.711A, lists "toxic reaction to local anesthesia in pregnancy (O29.3-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).