2027 ICD-10-CM Diagnosis Code T58Toxic effect of carbon monoxide
T58 is a non-billable ICD-10-CM category code for toxic effect of carbon monoxide, so it cannot be submitted on claims. Use a more specific code from this category instead, such as T58.01XA, T58.01XD, T58.01XS, and T58.02XA.
Code Identity
Code Classification
Specific Coding for Toxic effect of carbon monoxideOverview
Non-specific codes like T58 require more characters. Use one of these billable codes instead:
T58.0 for Toxic effect of carbon monoxide from motor vehicle exhaust
T58.01 for Toxic effect of carbon monoxide from motor vehicle exhaust, accidental (unintentional)
T58.02 for Toxic effect of carbon monoxide from motor vehicle exhaust, intentional self-harm
T58.03 for Toxic effect of carbon monoxide from motor vehicle exhaust, assault
T58.04 for Toxic effect of carbon monoxide from motor vehicle exhaust, undetermined
T58.1 for Toxic effect of carbon monoxide from utility gas
T58.11 for Toxic effect of carbon monoxide from utility gas, accidental (unintentional)
T58.12 for Toxic effect of carbon monoxide from utility gas, intentional self-harm
T58.13 for Toxic effect of carbon monoxide from utility gas, assault
T58.14 for Toxic effect of carbon monoxide from utility gas, undetermined
T58.2 for Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels
T58.2X for Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels
T58.8 for Toxic effect of carbon monoxide from other source
T58.8X for Toxic effect of carbon monoxide from other source
T58.9 for Toxic effect of carbon monoxide from unspecified source
T58.91 for Toxic effect of carbon monoxide from unspecified source, accidental (unintentional)
T58.92 for Toxic effect of carbon monoxide from unspecified source, intentional self-harm
T58.93 for Toxic effect of carbon monoxide from unspecified source, assault
T58.94 for Toxic effect of carbon monoxide from unspecified source, undetermined
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Toxic effect of carbon monoxide (T58). 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 T58: its own notes plus those printed at block T51-T65 and Chapter 19. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- asphyxiation from carbon monoxide
- toxic effect of carbon monoxide from all sources
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- 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 T58
- Ainitial encounter
- 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 T58, its category, or a range that includes it.
Patient EducationClinical
Carbon Monoxide Poisoning
Carbon monoxide (CO) is a gas that has no odor or color. But it is very dangerous. It can cause sudden illness and death. CO is found in combustion fumes, such as those made by cars and trucks, lanterns, stoves, gas ranges and heating systems. CO from these fumes can build up in places that don't have a good flow of fresh air.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code HistoryHistory
Questions About T58Overview
What is the ICD-10 code for toxic effect of carbon monoxide?
T58 is the ICD-10-CM category for toxic effect of carbon monoxide, but it is a non-billable header: claims need a more specific code from this category, listed on this page.
Is T58 (Toxic effect of carbon monoxide) a billable code?
No. This is a category header that groups the codes for toxic effect of carbon monoxide, and headers cannot be submitted on claims. Claims for toxic effect of carbon monoxide need a more specific code from this category, such as T58.01XA, T58.01XD, and T58.01XS.
Can T58 be reported with a code from Z77?
Not as a rule. The Excludes1 note at block T51-T65, which applies to T58, lists "contact with and (suspected) exposure to toxic substances (Z77.-)". 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).
