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    v1.0.28
    OpenPayerBilling CodesToxic effects of substances chiefly nonmedicinal as to sourceICD-10-CM t59-toxic-effect-of-other-gases
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    ICD-10-CM Code For Toxic Effect Of Other Gases Fumes And Vapors: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group T59 includes toxic effects from exposure to various other gases, fumes, and vapors such as nitrogen oxides, sulfur oxides, and other specified gaseous agents that can cause respiratory, neurologic, or systemic injury. These ICD-10-CM diagnosis codes are used to document clinical encounters for patients exposed to specific nonmedicinal gaseous substances, capturing severity, organ system involvement, and any related complications. Accurate coding within the ICD-10-CM T59 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM T59: Toxic Effect Of Other Gases, Fumes And Vapors Overview

    This group represents toxic effects from exposure to various nonmedicinal gases, fumes, and vapors that can injure multiple organ systems, most commonly the respiratory and central nervous systems. Accurate assignment of these codes captures the specific agent, intent, and any associated complications, which is important for clinical records and billing. Proper documentation influences reimbursement by supporting the medical necessity and severity of the exposures.

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    When to Use

    Use a code from this group when a patient has documented exposure to a specific nonmedicinal gas, fume, or vapor with clinical effects requiring medical attention. Select the code that specifies the agent and notes any associated complications or intent when documented in the clinical record.

    ICD-10-CM Codes

    132 rows

    ICD-10-CM CodeDescription
    T59.0X1AToxic effect of nitrogen oxides, accidental (unintentional), initial encounter
    T59.0X1DToxic effect of nitrogen oxides, accidental (unintentional), subsequent encounter
    T59.0X1SToxic effect of nitrogen oxides, accidental (unintentional), sequela
    T59.0X2AToxic effect of nitrogen oxides, intentional self-harm, initial encounter
    T59.0X2DToxic effect of nitrogen oxides, intentional self-harm, subsequent encounter
    T59.0X2SToxic effect of nitrogen oxides, intentional self-harm, sequela
    T59.0X3AToxic effect of nitrogen oxides, assault, initial encounter
    T59.0X3DToxic effect of nitrogen oxides, assault, subsequent encounter
    T59.0X3SToxic effect of nitrogen oxides, assault, sequela
    T59.0X4AToxic effect of nitrogen oxides, undetermined, initial encounter
    T59.0X4DToxic effect of nitrogen oxides, undetermined, subsequent encounter
    T59.0X4SToxic effect of nitrogen oxides, undetermined, sequela
    T59.1X1AToxic effect of sulfur dioxide, accidental (unintentional), initial encounter
    T59.1X1DToxic effect of sulfur dioxide, accidental (unintentional), subsequent encounter
    T59.1X1SToxic effect of sulfur dioxide, accidental (unintentional), sequela
    T59.1X2AToxic effect of sulfur dioxide, intentional self-harm, initial encounter
    T59.1X2DToxic effect of sulfur dioxide, intentional self-harm, subsequent encounter
    T59.1X2SToxic effect of sulfur dioxide, intentional self-harm, sequela
    T59.1X3AToxic effect of sulfur dioxide, assault, initial encounter
    T59.1X3DToxic effect of sulfur dioxide, assault, subsequent encounter

    Showing 1–20 of 132

    DRG Codes

    9 rows

    DRG CodeDescription
    917Poisoning and Toxic Effects of Drugs with MCC
    918Poisoning and Toxic Effects of Drugs without MCC
    922Other Injury, Poisoning and Toxic Effect Diagnoses with MCC
    923Other Injury, Poisoning and Toxic Effect Diagnoses without MCC
    928Full Thickness Burn with Skin Graft or Inhalation Injury with CC/MCC
    929Full Thickness Burn with Skin Graft or Inhalation Injury without CC/MCC
    934Full Thickness Burn without Skin Graft or Inhalation Injury
    949Aftercare with CC/MCC
    950Aftercare without CC/MCC

    Typical Clinical Scenarios

    • An otherwise healthy adult presents to the emergency department after inhaling high concentrations of chlorine gas following an industrial leak. They have acute coughing, dyspnea, chest tightness, and chemical pneumonitis on chest imaging; treatment is for acute toxic inhalation exposure and symptoms are expected to resolve or improve with supportive care. A code from this group is assigned for the confirmed acute toxic effect from a specific nonmedicinal gas exposure. Typical codes: T59.2X1A, T59.2X1D
    • An elderly resident of a poorly ventilated home with long-term exposure to indoor wood smoke develops chronic cough, exertional dyspnea, and recurrent bronchitic exacerbations managed by their primary care physician. Because their respiratory disease is related to ongoing exposure to smoke or fumes, a code from this group is used to capture the toxic effect contributing to their chronic pulmonary condition and to guide exposure counseling and care planning. Typical codes: T59.4X2A, T59.4X2D
    • A patient hospitalized for acute respiratory failure after accidental ignition of a household aerosol canister is recovering in the ICU; respiratory failure is listed as the primary problem and the toxic inhalation is documented as a complicating cause. A code from this group is assigned as a secondary code to indicate the toxic effect of the gas/fume that contributed to the severe complication and need for escalated care. Typical codes: T59.0X4A, T59.0X4D

    Related Codes

    T51-TOXIC-EFFECT-OF-ALCOHOL

    ICD-10-CM Code For Toxic Effect Of Alcohol: Group Overview

    T52-TOXIC-EFFECT-OF-ORGANIC-SOLVENTS

    ICD-10-CM Code For Toxic Effect Of Organic Solvents: Group Overview

    T53-TOXIC-EFFECT-HALOGENATED-HYDROCARBONS

    ICD-10-CM Code For Toxic Effect Of Halogen Derivatives Of Aliphatic And Aromatic Hydrocarbons: Group Overview

    T54-TOXIC-EFFECT-OF-CORROSIVE-SUBSTANCES

    ICD-10-CM Code For Toxic Effect Of Corrosive Substances: Group Overview

    T55-TOXIC-EFFECT-OF-SOAPS-AND-DETERGENTS

    ICD-10-CM Code For Toxic Effect Of Soaps And Detergents: Group Overview

    T57-TOXIC-EFFECT-OTHER-INORGANICS

    ICD-10-CM Code For Toxic Effect Of Other Inorganic Substances: Group Overview

    T58-TOXIC-EFFECT-OF-CARBON-MONOXIDE

    ICD-10-CM Code For Toxic Effect Of Carbon Monoxide: Group Overview

    T60-TOXIC-EFFECT-OF-PESTICIDES

    ICD-10-CM Code For Toxic Effect Of Pesticides: Group Overview

    T61-TOXIC-SEAFOOD-EXPOSURE

    ICD-10-CM Code For Toxic Effect Of Noxious Substances Eaten As Seafood: Group Overview

    T62-TOXIC-EFFECT-EATEN-AS-FOOD

    ICD-10-CM Code For Toxic Effect Of Other Noxious Substances Eaten As Food: Group Overview

    Showing 1–10 of 13

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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