2026 ICD-10-CM Diagnosis Code T59.92XAToxic effect of unspecified gases, fumes and vapors, intentional self-harm, initial encounter
T59.92XA is a billable ICD-10-CM diagnosis code for toxic effect of unspecified gases, fumes and vapors, intentional self-harm, 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, 928 through 929. Coders also document this condition as self poisoning by gas. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under External cause codes: intent of injury, self-harm; External cause codes: poisoning by non-drug; and Suicidal ideation/attempt/intentional self-harm.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Self poisoning by gas
- Suicide using domestic gas
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 2026, published by CMS and the National Center for Health Statistics.
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 |
|---|---|---|---|---|---|---|
| Fumes (from) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::carbon monoxide | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::charcoal (domestic use) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::chloroform | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::coke (in domestic stoves, fireplaces) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::corrosive NEC | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::ether | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::freons | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::hydrocarbons | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::hydrocarbons::petroleum (liquefied) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::hydrocarbons::petroleum (liquefied)::distributed through pipes (pure or mixed with air) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::lead | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::metal | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::nitrogen dioxide | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::pesticides | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::petroleum (liquefied) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::petroleum (liquefied)::distributed through pipes (pure or mixed with air) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::polyester | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::specified source NEC [See Also: substance specified] | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Fumes (from)::sulfur dioxide | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::acetylene | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::acetylene::incomplete combustion of | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::air contaminants, source or type not specified | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::anesthetic | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::blast furnace | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::butane | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::carbon monoxide | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::chlorine | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::coal | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::cyanide | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::dicyanogen | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::domestic | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::exhaust | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::from utility (for cooking, heating, or lighting) (after combustion) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::from utility (for cooking, heating, or lighting) (after combustion)::prior to combustion | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::from wood- or coal-burning stove or fireplace | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::fuel (domestic use) (after combustion) [See Also: Carbon, monoxide, fuel] | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::fuel (domestic use) (after combustion) [See Also: Carbon, monoxide, fuel]::industrial use | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::fuel (domestic use) (after combustion) [See Also: Carbon, monoxide, fuel]::prior to combustion | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::fuel (domestic use) (after combustion) [See Also: Carbon, monoxide, fuel]::utility | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::fuel (domestic use) (after combustion) [See Also: Carbon, monoxide, fuel]::utility::in mobile container | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::fuel (domestic use) (after combustion) [See Also: Carbon, monoxide, fuel]::utility::incomplete combustion of | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::fuel (domestic use) (after combustion) [See Also: Carbon, monoxide, fuel]::utility::piped (natural) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::garage | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::hydrocarbon NEC | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::hydrocarbon NEC::incomplete combustion of | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::hydrocarbon NEC::liquefied | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::hydrocarbon NEC::liquefied::piped | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::hydrocyanic acid | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::illuminating (after combustion) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::illuminating (after combustion)::prior to combustion | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::incomplete combustion, any | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::kiln | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::lacrimogenic | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::liquefied petroleum | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::marsh | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::motor exhaust, not in transit | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::mustard, not in war | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::natural | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::nerve, not in war | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::oil | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::petroleum (liquefied) (distributed in mobile containers) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::petroleum (liquefied) (distributed in mobile containers)::piped (pure or mixed with air) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::piped (manufactured) (natural) NEC | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::producer | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::propane | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::refrigerant (chlorofluoro-carbon) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::refrigerant (chlorofluoro-carbon)::not chlorofluoro-carbon | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::sewer | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::specified source NEC | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::stove (after combustion) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::stove (after combustion)::prior to combustion | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::tear | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::therapeutic | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::utility (for cooking, heating, or lighting) (piped) NEC | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::utility (for cooking, heating, or lighting) (piped) NEC::in mobile container | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::utility (for cooking, heating, or lighting) (piped) NEC::incomplete combustion of | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::utility (for cooking, heating, or lighting) (piped) NEC::piped (natural) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::water | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Gas NEC::water::incomplete combustion of | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Lung irritant (gas) NEC | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Nerve gas, not in war | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Sewer gas | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Vapor [See Also: Gas] | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Vapor [See Also: Gas]::kiln (carbon monoxide) | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Vapor [See Also: Gas]::lead | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
| Vapor [See Also: Gas]::specified source NEC | T59.91 | T59.92 | T59.93 | T59.94 | – | – |
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
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Convert T59.92XA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T59.92XAOverview
Is T59.92XA a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report toxic effect of unspecified gases, fumes and vapors, intentional self-harm, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T59.92XA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for toxic effect of unspecified gases, fumes and vapors, intentional self-harm, such as an emergency visit or first evaluation.
What MS-DRG does T59.92XA group to?
When toxic effect of unspecified gases, fumes and vapors, intentional self-harm, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 917, 918, 928, 929, with relative weights from 0.8571 to 7.1727 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of T59.92XA?
Under the General Equivalence Mappings, toxic effect of unspecified gases, fumes and vapors, intentional self-harm, initial encounter converts to ICD-9-CM 987.9 (toxic eff gas/vapor NOS) and E952.9 (poison-gas/vapor NOS). 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.
