ICD-10-CM 2027 diagnosis code

T59.811Toxic effect of smoke, accidental (unintentional)

Not billable — use a more specific codeRequires 7th character

T59.811 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.

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 T59.811

T59.811 is the ICD-10-CM diagnosis code for toxic effect of smoke, accidental (unintentional). It belongs to category T59 (toxic effect of other gases, fumes and vapors), 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 T59.81 (toxic effect of smoke), T59.811 is specifically for toxic effect of smoke, accidental (unintentional). Related codes cover intentional self-harm (T59.812), assault (T59.813) and undetermined (T59.814).

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 T59

Ainitial encounterT59.811A
Dsubsequent encounterT59.811D
SsequelaT59.811S

Coding notes

Applicable toConditions and synonyms classified to this code

Toxic effect of smoke NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to T59.811.

› From T59.81 Toxic effect of smoke

Excludes2

toxic effect of cigarette (tobacco) smoke (T65.22-)

› From T59 Toxic effect of other gases, fumes and vapors

Includes

aerosol propellants

Excludes1

chlorofluorocarbons (T53.5)

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

Smoke NEC — Poisoning Accidental (unintentional)

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 T59.811

Is T59.811 billable?: No. T59.811 is a header code. Report one of its more specific subcodes instead.