2026 ICD-10-CM Diagnosis Code T41.41XAPoisoning by unspecified anesthetic, accidental (unintentional), initial encounter

ICD-10-CM Codes›S00–T88›T36-T50›T41

ICD-10-CM T41.41XA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T41.41XA is a billable ICD-10-CM diagnosis code for poisoning by unspecified anesthetic, 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 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 917 through 918. Coders also document this condition as overdose of anesthetic agent. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under External cause codes: intent of injury, accidental/unintentional; External cause codes: poisoning by drug; and Poisoning by drugs, initial encounter.

Code Identity

ICD-10-CM Code
T41.41XA
Billable Status
Yes — Valid for Submission
Code Describes
Poisoning by unspecified anesthetic, accidental (unintentional), initial encounter
Short Description
Poisoning by unsp anesthetic, accidental, init
Parent Code
T41.41
Poisoning by unspecified anesthetic, 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
CategoryT41Poisoning by, adverse effect of and underdosing of anesthetics and therapeutic gases
This CodeT41.41XAPoisoning by unspecified anesthetic, accidental (unintentional), initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Overdose of anesthetic agent
  • Poisoning by anesthetic agent

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 anesthetics and therapeutic gases (T41). 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 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

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

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

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
Anesthetic NEC [See Also: Anesthesia]T41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::with muscle relaxantT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::with muscle relaxant::generalT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::with muscle relaxant::localT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::gaseous NECT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::general NECT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::halogenated hydrocarbon derivatives NECT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::infiltration NECT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::intravenous NECT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::local NECT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::rectalT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::rectal::generalT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::rectal::localT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::regional NECT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::spinal NECT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::thiobarbiturateT41.41T41.42T41.43T41.44T41.45T41.46
Anesthetic NEC [See Also: Anesthesia]::topicalT41.41T41.42T41.43T41.44T41.45T41.46

Patient EducationClinical

Anesthesia

Anesthesia is the use of medicines, called anesthetics, to prevent pain during surgery and other medical procedures. Medicine may be given by injection, inhalation, topical lotion, spray, eye drops, or a skin patch.

The full article covers:

  • What is anesthesia?
  • What is anesthesia used for?
  • What are the types of anesthesia?
  • What are the risks of anesthesia?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert T41.41XA to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
968.9 Pois-local anest NEC/NOS
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
E855.1 Acc poisn-cns depres NEC
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T41.41XAOverview

Is T41.41XA a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report poisoning by unspecified anesthetic, accidental (unintentional), initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T41.41XA mean?

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

What MS-DRG does T41.41XA group to?

When poisoning by unspecified anesthetic, accidental (unintentional), initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 917, 918, with relative weights from 0.8571 to 1.5684 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of T41.41XA?

Under the General Equivalence Mappings, poisoning by unspecified anesthetic, accidental (unintentional), initial encounter converts to ICD-9-CM 968.9 (pois-local anest NEC/NOS) and E855.1 (acc poisn-cns depres NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.