2026 ICD-10-CM Diagnosis Code T41.1X1SPoisoning by intravenous anesthetics, accidental (unintentional), sequela
T41.1X1S is a billable ICD-10-CM diagnosis code for poisoning by intravenous anesthetics, accidental (unintentional), sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 922 through 923. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Poisoning/toxic effect/adverse effects/underdosing, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
T41.1X1S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Accidental etomidate overdose
- Accidental etomidate poisoning
- Accidental methohexitone overdose
- Accidental methohexitone poisoning
- Accidental poisoning by thiobarbiturate
- Accidental thiopental overdose
- Accidental thiopental poisoning
- Etomidate overdose
- Etomidate poisoning
- Intravenous anesthetic agent overdose
- Methohexitone overdose
- Poisoning by methohexital
- Poisoning by thiobarbiturate
- Poisoning caused by thiopental
- Thiopental overdose
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.
Clinical InformationClinical
Etomidate
imidazole derivative anesthetic and hypnotic with little effect on blood gases, ventilation, or the cardiovascular system. it has been proposed as an induction anesthetic.Methohexital
an intravenous anesthetic with a short duration of action that may be used for induction of anesthesia.Thiamylal
a barbiturate that is administered intravenously for the production of complete anesthesia of short duration, for the induction of general anesthesia, or for inducing a hypnotic state. (from martindale, the extra pharmacopoeia, 30th ed, p919)
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.
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 T41.1X1S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T41.1X1SOverview
Is T41.1X1S a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report poisoning by intravenous anesthetics, accidental (unintentional), sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in T41.1X1S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the poisoning by intravenous anesthetics, accidental (unintentional) itself has resolved, not the original event.
What MS-DRG does T41.1X1S group to?
When poisoning by intravenous anesthetics, accidental (unintentional), sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, with relative weights from 1.0177 to 1.7494 depending on complications. Higher weights mean higher Medicare reimbursement.
Is T41.1X1S exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for poisoning by intravenous anesthetics, accidental (unintentional), sequela on inpatient claims.
What is the ICD-9 equivalent of T41.1X1S?
Under the General Equivalence Mappings, poisoning by intravenous anesthetics, accidental (unintentional), sequela converts to ICD-9-CM 909.0 (late eff drug poisoning) and E929.2 (late eff acc poisoning). 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.
