ICD-10-CM 2027 diagnosis code
T58.04Toxic effect of carbon monoxide from motor vehicle exhaust, undetermined
T58.04 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.Short description: Toxic effect of carb monx from mtr veh exhaust, undetermined
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About T58.04
T58.04 is the ICD-10-CM diagnosis code for toxic effect of carbon monoxide from motor vehicle exhaust, undetermined. It belongs to category T58 (toxic effect of carbon monoxide), block T51-T65 (toxic effects of substances chiefly nonmedicinal as to source) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.
Within T58.0 (toxic effect of carbon monoxide from motor vehicle exhaust), T58.04 is specifically for toxic effect of carbon monoxide from motor vehicle exhaust, undetermined. Related codes cover accidental (unintentional) (T58.01), intentional self-harm (T58.02) and assault (T58.03).
Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
7th character
The appropriate 7th character is to be added to each code from category T58
Notes that apply from higher levels
Instructions written at a parent level also apply to T58.04.
› From T58 Toxic effect of carbon monoxide
- asphyxiation from carbon monoxide
- toxic effect of carbon monoxide from all sources
Broader instructions also apply from T51-T65 Toxic effects of substances chiefly nonmedicinal as to source and Chapter 19: Injury, poisoning and certain other consequences of external causes.
Table of Drugs & Neoplasms entries
- Carbon › monoxide (from incomplete combustion) › exhaust gas (motor) not in transit — Poisoning Undetermined
- Carbon › monoxide (from incomplete combustion) › exhaust gas (motor) not in transit › combustion engine, any not in watercraft — Poisoning Undetermined
- Carbon › monoxide (from incomplete combustion) › exhaust gas (motor) not in transit › farm tractor, not in transit — Poisoning Undetermined
- Carbon › monoxide (from incomplete combustion) › exhaust gas (motor) not in transit › gas engine — Poisoning Undetermined
- Carbon › monoxide (from incomplete combustion) › exhaust gas (motor) not in transit › motor pump — Poisoning Undetermined
- Carbon › monoxide (from incomplete combustion) › exhaust gas (motor) not in transit › motor vehicle, not in transit — Poisoning Undetermined
- Carbon › monoxide (from incomplete combustion) › motor exhaust gas, not in transit — Poisoning Undetermined
- Exhaust gas (engine) (motor vehicle) — Poisoning Undetermined
- Fuel › automobile › exhaust gas, not in transit — Poisoning Undetermined
- Gas NEC › exhaust — Poisoning Undetermined
- Gas NEC › garage — Poisoning Undetermined
- Gas NEC › motor exhaust, not in transit — Poisoning Undetermined
- Motor exhaust gas — Poisoning Undetermined
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about T58.04
Is T58.04 billable?
- No. T58.04 is a header code. Report one of its more specific subcodes instead.