ICD-10-CM 2027 diagnosis code
T58.8X4Toxic effect of carbon monoxide from other source, undetermined
T58.8X4 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 oth source, 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 T58.8X4
T58.8X4 is the ICD-10-CM diagnosis code for toxic effect of carbon monoxide from other source, 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 T58.8X (toxic effect of carbon monoxide from other source), T58.8X4 is specifically for toxic effect of carbon monoxide from other source, undetermined. Related codes cover accidental (unintentional) (T58.8X1), intentional self-harm (T58.8X2) and assault (T58.8X3).
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 T58.8X4.
› 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
- Blast furnace gas (carbon monoxide from) — Poisoning Undetermined
- Carbon › monoxide (from incomplete combustion) › blast furnace gas — Poisoning Undetermined
- Carbon › monoxide (from incomplete combustion) › industrial fuels or gases, any — Poisoning Undetermined
- Carbon › monoxide (from incomplete combustion) › kiln gas or vapor — Poisoning Undetermined
- Carbon › monoxide (from incomplete combustion) › producer gas — Poisoning Undetermined
- Carbon › monoxide (from incomplete combustion) › specified source NEC — Poisoning Undetermined
- Charcoal › fumes (Carbon monoxide) › industrial — Poisoning Undetermined
- Coke fumes or gas (carbon monoxide) › industrial use — Poisoning Undetermined
- Fuel › industrial, incomplete combustion — Poisoning Undetermined
- Furnace (coal burning) (domestic), gas from › industrial — Poisoning Undetermined
- Gas NEC › blast furnace — Poisoning Undetermined
- Gas NEC › fuel (domestic use) (after combustion) › industrial use — Poisoning Undetermined
- Gas NEC › kiln — Poisoning Undetermined
- Gas NEC › producer — Poisoning Undetermined
- Kiln gas or vapor (carbon monoxide) — Poisoning Undetermined
- Producer gas — Poisoning Undetermined
- Vapor › kiln (carbon monoxide) — 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 T58.8X4
Is T58.8X4 billable?
- No. T58.8X4 is a header code. Report one of its more specific subcodes instead.