2026 ICD-10-CM Diagnosis Code T59Toxic effect of other gases, fumes and vapors
T59 is a non-billable ICD-10-CM category code for toxic effect of other gases, fumes and vapors, so it cannot be submitted on claims. Use a more specific code from this category instead, such as T59.0X1A, T59.0X1D, T59.0X1S, and T59.0X2A.
Code Identity
Code Classification
Specific Coding for Toxic effect of other gases, fumes and vaporsOverview
Non-specific codes like T59 require more characters. Use one of these billable codes instead:
T59.0 for Toxic effect of nitrogen oxides
T59.0X for Toxic effect of nitrogen oxides
T59.1 for Toxic effect of sulfur dioxide
T59.1X for Toxic effect of sulfur dioxide
T59.2 for Toxic effect of formaldehyde
T59.2X for Toxic effect of formaldehyde
T59.3 for Toxic effect of lacrimogenic gas
T59.3X for Toxic effect of lacrimogenic gas
T59.4 for Toxic effect of chlorine gas
T59.4X for Toxic effect of chlorine gas
T59.5 for Toxic effect of fluorine gas and hydrogen fluoride
T59.5X for Toxic effect of fluorine gas and hydrogen fluoride
T59.6 for Toxic effect of hydrogen sulfide
T59.6X for Toxic effect of hydrogen sulfide
T59.7 for Toxic effect of carbon dioxide
T59.7X for Toxic effect of carbon dioxide
T59.8 for Toxic effect of other specified gases, fumes and vapors
T59.81 for Toxic effect of smoke
T59.89 for Toxic effect of other specified gases, fumes and vapors
T59.9 for Toxic effect of unspecified gases, fumes and vapors
T59.91 for Toxic effect of unspecified gases, fumes and vapors, accidental (unintentional)
T59.92 for Toxic effect of unspecified gases, fumes and vapors, intentional self-harm
T59.93 for Toxic effect of unspecified gases, fumes and vapors, assault
T59.94 for Toxic effect of unspecified gases, fumes and vapors, undetermined
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.
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Includes
- aerosol propellants
Type 1 Excludes
- chlorofluorocarbons T53.5
7th Character Note
- The appropriate 7th character is to be added to each code from category T59
7th Character
- A - initial encounter
- D - subsequent encounter
- S - sequela
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
Indicates that a seventh character is to be assigned to codes in a subcategory.
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.
Code HistoryHistory
Questions About T59Overview
Is T59 (Toxic effect of other gases, fumes and vapors) a billable code?
No. This is a category header that groups the codes for toxic effect of other gases, fumes and vapors, and headers cannot be submitted on claims. Claims for toxic effect of other gases, fumes and vapors need a more specific code from this category, such as T59.0X1A, T59.0X1D, and T59.0X1S.
