Toxic effect of carbon monoxide (T58) ICD-10-CM
The T58 code range covers toxic effect of carbon monoxide with 88 ICD-10-CM diagnosis codes. 60 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- asphyxiation from carbon monoxide
- toxic effect of carbon monoxide from all sources
7th Character Note
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.
- The appropriate 7th character is to be added to each code from category T58
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the T58 Range 88 codes · 60 billable
- T58 Toxic effect of carbon monoxideNon-billable
- T58.0 Toxic effect of carbon monoxide from motor vehicle exhaustNon-billable
- T58.01 Toxic effect of carbon monoxide from motor vehicle exhaust, accidental (unintentional)Non-billable
- T58.01XA Toxic effect of carbon monoxide from motor vehicle exhaust, accidental (unintentional), initial encounter
- T58.01XD Toxic effect of carbon monoxide from motor vehicle exhaust, accidental (unintentional), subsequent encounter
- T58.01XS Toxic effect of carbon monoxide from motor vehicle exhaust, accidental (unintentional), sequela
- T58.02 Toxic effect of carbon monoxide from motor vehicle exhaust, intentional self-harmNon-billable
- T58.02XA Toxic effect of carbon monoxide from motor vehicle exhaust, intentional self-harm, initial encounter
- T58.02XD Toxic effect of carbon monoxide from motor vehicle exhaust, intentional self-harm, subsequent encounter
- T58.02XS Toxic effect of carbon monoxide from motor vehicle exhaust, intentional self-harm, sequela
- T58.03 Toxic effect of carbon monoxide from motor vehicle exhaust, assaultNon-billable
- T58.03XA Toxic effect of carbon monoxide from motor vehicle exhaust, assault, initial encounter
- T58.03XD Toxic effect of carbon monoxide from motor vehicle exhaust, assault, subsequent encounter
- T58.03XS Toxic effect of carbon monoxide from motor vehicle exhaust, assault, sequela
- T58.04 Toxic effect of carbon monoxide from motor vehicle exhaust, undeterminedNon-billable
- T58.04XA Toxic effect of carbon monoxide from motor vehicle exhaust, undetermined, initial encounter
- T58.04XD Toxic effect of carbon monoxide from motor vehicle exhaust, undetermined, subsequent encounter
- T58.04XS Toxic effect of carbon monoxide from motor vehicle exhaust, undetermined, sequela
- T58.1 Toxic effect of carbon monoxide from utility gasNon-billable
- T58.11 Toxic effect of carbon monoxide from utility gas, accidental (unintentional)Non-billable
- T58.11XA Toxic effect of carbon monoxide from utility gas, accidental (unintentional), initial encounter
- T58.11XD Toxic effect of carbon monoxide from utility gas, accidental (unintentional), subsequent encounter
- T58.11XS Toxic effect of carbon monoxide from utility gas, accidental (unintentional), sequela
- T58.12 Toxic effect of carbon monoxide from utility gas, intentional self-harmNon-billable
- T58.12XA Toxic effect of carbon monoxide from utility gas, intentional self-harm, initial encounter
- T58.12XD Toxic effect of carbon monoxide from utility gas, intentional self-harm, subsequent encounter
- T58.12XS Toxic effect of carbon monoxide from utility gas, intentional self-harm, sequela
- T58.13 Toxic effect of carbon monoxide from utility gas, assaultNon-billable
- T58.13XA Toxic effect of carbon monoxide from utility gas, assault, initial encounter
- T58.13XD Toxic effect of carbon monoxide from utility gas, assault, subsequent encounter
- T58.13XS Toxic effect of carbon monoxide from utility gas, assault, sequela
- T58.14 Toxic effect of carbon monoxide from utility gas, undeterminedNon-billable
- T58.14XA Toxic effect of carbon monoxide from utility gas, undetermined, initial encounter
- T58.14XD Toxic effect of carbon monoxide from utility gas, undetermined, subsequent encounter
- T58.14XS Toxic effect of carbon monoxide from utility gas, undetermined, sequela
- T58.2 Toxic effect of carbon monoxide from incomplete combustion of other domestic fuelsNon-billable
- T58.2X Toxic effect of carbon monoxide from incomplete combustion of other domestic fuelsNon-billable
- T58.2X1 Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, accidental (unintentional)Non-billable
- T58.2X1A Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, accidental (unintentional), initial encounter
- T58.2X1D Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, accidental (unintentional), subsequent encounter
- T58.2X1S Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, accidental (unintentional), sequela
- T58.2X2 Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harmNon-billable
- T58.2X2A Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm, initial encounter
- T58.2X2D Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm, subsequent encounter
- T58.2X2S Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm, sequela
- T58.2X3 Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, assaultNon-billable
- T58.2X3A Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, assault, initial encounter
- T58.2X3D Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, assault, subsequent encounter
- T58.2X3S Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, assault, sequela
- T58.2X4 Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, undeterminedNon-billable
- T58.2X4A Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, undetermined, initial encounter
- T58.2X4D Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, undetermined, subsequent encounter
- T58.2X4S Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, undetermined, sequela
- T58.8 Toxic effect of carbon monoxide from other sourceNon-billable
- T58.8X Toxic effect of carbon monoxide from other sourceNon-billable
- T58.8X1 Toxic effect of carbon monoxide from other source, accidental (unintentional)Non-billable
- T58.8X1A Toxic effect of carbon monoxide from other source, accidental (unintentional), initial encounter
- T58.8X1D Toxic effect of carbon monoxide from other source, accidental (unintentional), subsequent encounter
- T58.8X1S Toxic effect of carbon monoxide from other source, accidental (unintentional), sequela
- T58.8X2 Toxic effect of carbon monoxide from other source, intentional self-harmNon-billable
- T58.8X2A Toxic effect of carbon monoxide from other source, intentional self-harm, initial encounter
- T58.8X2D Toxic effect of carbon monoxide from other source, intentional self-harm, subsequent encounter
- T58.8X2S Toxic effect of carbon monoxide from other source, intentional self-harm, sequela
- T58.8X3 Toxic effect of carbon monoxide from other source, assaultNon-billable
- T58.8X3A Toxic effect of carbon monoxide from other source, assault, initial encounter
- T58.8X3D Toxic effect of carbon monoxide from other source, assault, subsequent encounter
- T58.8X3S Toxic effect of carbon monoxide from other source, assault, sequela
- T58.8X4 Toxic effect of carbon monoxide from other source, undeterminedNon-billable
- T58.8X4A Toxic effect of carbon monoxide from other source, undetermined, initial encounter
- T58.8X4D Toxic effect of carbon monoxide from other source, undetermined, subsequent encounter
- T58.8X4S Toxic effect of carbon monoxide from other source, undetermined, sequela
- T58.9 Toxic effect of carbon monoxide from unspecified sourceNon-billable
- T58.91 Toxic effect of carbon monoxide from unspecified source, accidental (unintentional)Non-billable
- T58.91XA Toxic effect of carbon monoxide from unspecified source, accidental (unintentional), initial encounter
- T58.91XD Toxic effect of carbon monoxide from unspecified source, accidental (unintentional), subsequent encounter
- T58.91XS Toxic effect of carbon monoxide from unspecified source, accidental (unintentional), sequela
- T58.92 Toxic effect of carbon monoxide from unspecified source, intentional self-harmNon-billable
- T58.92XA Toxic effect of carbon monoxide from unspecified source, intentional self-harm, initial encounter
- T58.92XD Toxic effect of carbon monoxide from unspecified source, intentional self-harm, subsequent encounter
- T58.92XS Toxic effect of carbon monoxide from unspecified source, intentional self-harm, sequela
- T58.93 Toxic effect of carbon monoxide from unspecified source, assaultNon-billable
- T58.93XA Toxic effect of carbon monoxide from unspecified source, assault, initial encounter
- T58.93XD Toxic effect of carbon monoxide from unspecified source, assault, subsequent encounter
- T58.93XS Toxic effect of carbon monoxide from unspecified source, assault, sequela
- T58.94 Toxic effect of carbon monoxide from unspecified source, undeterminedNon-billable
- T58.94XA Toxic effect of carbon monoxide from unspecified source, undetermined, initial encounter
- T58.94XD Toxic effect of carbon monoxide from unspecified source, undetermined, subsequent encounter
- T58.94XS Toxic effect of carbon monoxide from unspecified source, undetermined, sequela
About the T58 Code Range
The ICD-10 code section T58 classifies the toxic effects caused by exposure to carbon monoxide (CO) from various sources. These codes specify the source of carbon monoxide, such as motor vehicle exhaust, utility gas, domestic fuels, or other unknown sources, and capture the intent of exposure, including accidental, intentional self-harm, assault, or undetermined causes.
This range of codes provides detailed documentation for carbon monoxide poisoning incidents. For example, codes like T58.01XA cover accidental poisoning from motor vehicle exhaust and include synonyms such as "carbon monoxide poisoning from motor vehicle exhaust" or "accidental poisoning by motor vehicle exhaust gas," helping coders link the condition to the exact code. Likewise, intentional self-harm by carbon monoxide inhalation is coded under T58.02XA with synonyms including "suicide attempt by carbon monoxide inhalation" or "self poisoning by motor vehicle exhaust gas." Other variations specify initial, subsequent, or sequela encounters to accurately represent the treatment stage. These codes enable precise classification of carbon monoxide toxicity cases, essential for clinical, legal, and epidemiological purposes. Understanding these distinctions helps healthcare professionals and coders assign the correct ICD-10 code for carbon monoxide poisoning according to the source, intent, and clinical setting.
Questions About This Page
How many billable codes are in the T58 range?
Of the 88 codes in this range, 60 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the T58 range classify?
The range classifies toxic effect of carbon monoxide. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
