2027 ICD-10-CM Diagnosis Code T59.891AToxic effect of other specified gases, fumes and vapors, accidental (unintentional), initial encounter
T59.891A is a billable ICD-10-CM diagnosis code for toxic effect of other specified gases, fumes and vapors, 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, 928 through 929, 934. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under External cause codes: intent of injury, accidental/unintentional; External cause codes: poisoning by non-drug; and Toxic effects, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Accidental poisoning by acetylene
- Accidental poisoning by bromine compounds
- Accidental poisoning by butane
- Accidental poisoning by gas distributed by pipeline
- Accidental poisoning by liquefied petroleum gas distributed in mobile containers
- Accidental poisoning by liquefied petroleum gas distributed through pipes
- Accidental poisoning by methyl bromide
- Accidental poisoning by petroleum products
- Accidental poisoning by piped natural gas
- Accidental poisoning by propane
- Accidental poisoning caused by halogenated hydrocarbon
- Acroosteolysis
- Alkane poisoning
- Ammonia encephalopathy
- Automotive products causing toxic effect
- Brake fluid causing toxic effect
- Bromine compound poisoning
- Injury due to legal intervention by gas
- Injury due to legal intervention by tear gas
- Injury due to poison gas weapon
- Methane poisoning
- Mustard gas poisoning
- Occupational acroosteolysis
- Poisoning caused by halogenated hydrocarbon
- Poisoning due to irritant gas
- Poisoning due to nerve gas
- Poisoning due to vesicant gas
- Polymer fume fever
- Teflon poisoning
- Toxic effect of butane
- Toxic effect of hydrocarbon gas
- Toxic effect of liquefied petroleum gas
- Toxic effect of nitrous fumes
- Toxic effect of phosgene
- Toxic effect of polyester fumes
- Toxic effect of propane
- Toxic inhalation-induced febrile illness
- Vinyl chloride disease
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Toxic effect of other gases, fumes and vapors (T59). 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 T59.891A: its own notes plus those printed at T59, block T51-T65, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- chlorofluorocarbons (T53.5)
- contact with and (suspected) exposure to toxic substances (Z77.-)
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.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify any retained foreign body, if applicable (Z18.-)
Notes
General instructions on how these codes are used.
- When no intent is indicated code to accidental. Undetermined intent is only for use when there is specific documentation in the record that the intent of the toxic effect cannot be determined.
- 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.
- The appropriate 7th character is to be added to each code from category T59
- 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 T59.891A, its category, or a range that includes it.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
| Substance | Accidental | Self-harm | Assault | Undetermined | Adverse Effect | Underdosing |
|---|---|---|---|---|---|---|
| Acetylene (gas) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Acetylene (gas)::industrial | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Acridine::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Acrolein (gas) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Alcohol::vapor (from any type of Alcohol) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Ammonia (fumes) (gas) (vapor) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Ammonium::compounds (household) NEC::fumes (any usage) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Amyl::acetate::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Anticholinesterase::organophosphorus::nerve gas | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Boron::trifluoride | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Brake fluid vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Bromine::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Butane (distributed in mobile container) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Butane (distributed in mobile container)::distributed through pipes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Cholinergic (drug) NEC::organophosphorus::nerve gas | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Coal (carbon monoxide from) [See Also: Carbon, monoxide, coal]::tar::fumes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Combustion gas (after combustion) [See: Carbon, monoxide]::prior to combustion | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Cordite::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Cyanic acid (gas) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Cyanogen (chloride) (gas) NEC | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Decaborane::fumes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Diazomethane (gas) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Diborane (gas) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Dichloroethyl sulfide, not in war | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Dichloroformoxine, not in war | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Dimethyl::sulfate (fumes) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Dinitrobenzene::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Dinitrobenzol::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Domestic gas (after combustion) [See: Gas, utility]::prior to combustion | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Dynamite::fumes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Ethidium chloride (vapor) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Ethyl::aldehyde (vapor) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Ethylene (gas) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Ethylene (gas)::oxide (fumigant) (nonmedicinal) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Ferrovanadium (fumes) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Firedamp | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Formic acid::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Fuel::gas (domestic use) [See Also: Carbon, monoxide, fuel, utility] | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Fuel::gas (domestic use) [See Also: Carbon, monoxide, fuel, utility]::utility | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Fuel::gas (domestic use) [See Also: Carbon, monoxide, fuel, utility]::utility::in mobile container | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Fuel::gas (domestic use) [See Also: Carbon, monoxide, fuel, utility]::utility::piped (natural) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Fumes (from)::hydrocarbons | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Fumes (from)::hydrocarbons::petroleum (liquefied) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Fumes (from)::hydrocarbons::petroleum (liquefied)::distributed through pipes (pure or mixed with air) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Fumes (from)::petroleum (liquefied) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Fumes (from)::petroleum (liquefied)::distributed through pipes (pure or mixed with air) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Fumes (from)::polyester | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Fumes (from)::specified source NEC [See Also: substance specified] | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::acetylene | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::from utility (for cooking, heating, or lighting) (after combustion) [See: Carbon, monoxide, fuel, utility]::prior to combustion | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::fuel (domestic use) (after combustion) [See Also: Carbon, monoxide, fuel]::prior to combustion | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::fuel (domestic use) (after combustion) [See Also: Carbon, monoxide, fuel]::utility | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::fuel (domestic use) (after combustion) [See Also: Carbon, monoxide, fuel]::utility::in mobile container | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::fuel (domestic use) (after combustion) [See Also: Carbon, monoxide, fuel]::utility::piped (natural) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::hydrocarbon NEC | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::hydrocarbon NEC::liquefied [See: butane]::piped | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::illuminating (after combustion)::prior to combustion | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::marsh | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::mustard, not in war | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::natural | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::petroleum (liquefied) (distributed in mobile containers) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::petroleum (liquefied) (distributed in mobile containers)::piped (pure or mixed with air) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::piped (manufactured) (natural) NEC | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::refrigerant (chlorofluoro-carbon)::not chlorofluoro-carbon | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::stove (after combustion)::prior to combustion | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::utility (for cooking, heating, or lighting) (piped) NEC | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::utility (for cooking, heating, or lighting) (piped) NEC::in mobile container | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Gas NEC::utility (for cooking, heating, or lighting) (piped) NEC::piped (natural) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Helium (nonmedicinal) NEC | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Hexahydrocresol (s)::cyanide::gas | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Hexahydrocresol (s)::Fluoride (liquid)::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Hydrocarbon gas | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Hydrocarbon gas::liquefied (mobile container) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Hydrocarbon gas::liquefied (mobile container)::piped (natural) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Hydrochloric acid (liquid)::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Hydrofluoric acid (liquid)::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Hydrogen | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Hydroquinone::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Illuminating gas (after combustion)::prior to combustion | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Industrial::fumes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Iodine (antiseptic, external) (tincture) NEC::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Ligroin (e) (solvent)::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Liquefied petroleum gases | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Liquefied petroleum gases::piped (pure or mixed with air) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Marsh gas | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Methane | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Methanethiol | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Methyl::bromide (gas) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Methyl::chloride (gas) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Methyl::mercaptan | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Methyl::sulfate (fumes) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Natural::gas (piped) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Nitric::acid (liquid)::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Nitroaniline::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Nitrous::acid (liquid)::fumes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Oil (of)::fumes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Ozone | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Paint NEC::fumes NEC | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Phosgene (gas) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Polyester fumes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Polyester resin hardener::fumes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Polytetrafluoroethylene (inhaled) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Propane (distributed in mobile container) | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Propane (distributed in mobile container)::distributed through pipes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Propylene | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Pyridine::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Refrigerant gas (chlorofluoro-carbon)::not chlorofluoro-carbon | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Selenium NEC::fumes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Sternutator gas | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Sulfur, sulfurated, sulfuric, sulfurous, sulfuryl (compounds NEC) (medicinal)::vapor NEC | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Tar NEC::fumes | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Toluidine::vapor | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Vapor [See Also: Gas]::specified source NEC | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
| Vinyl::chloride | T59.891 | T59.892 | T59.893 | T59.894 | – | – |
Patient EducationClinical
Poisoning
A poison is any substance that is harmful to your body. You might swallow it, inhale it, inject it, or absorb it through your skin. Any substance can be poisonous if too much is taken. Poisons can include:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T59.891A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code History & ChangesHistory
Replaced This code was replaced in the FY 2027 code set by:
- T59.821A - Toxic effect of hexamethylene diisocyanate, acc, init
Questions About T59.891AOverview
Is T59.891A a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report toxic effect of other specified gases, fumes and vapors, accidental (unintentional), initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character A in T59.891A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for toxic effect of other specified gases, fumes and vapors, accidental (unintentional), such as an emergency visit or first evaluation.
What MS-DRG does T59.891A group to?
When toxic effect of other specified gases, fumes and vapors, accidental (unintentional), initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 918, 929, 934, 928, 917, with relative weights from 0.8716 to 7.6444 depending on complications. Higher weights mean higher Medicare reimbursement.
Can T59.891A be reported with T53.5?
Not as a rule. The Excludes1 note at T59, which applies to T59.891A, lists "chlorofluorocarbons (T53.5)". 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).
What is the ICD-9 equivalent of T59.891A?
Under the General Equivalence Mappings, toxic effect of other specified gases, fumes and vapors, accidental (unintentional), initial encounter converts to ICD-9-CM 987.9 (toxic eff gas/vapor NOS) and E869.8 (acc poison-gas/vapor NEC). The mapping is approximate, so confirm the match fits the documentation.
