T59.81Toxic effect of smoke

T59.81 is the ICD-10-CM diagnosis code for toxic effect of smoke. 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 4 subcodes must be used instead.

Within T59.8 (toxic effect of other specified gases, fumes and vapors), T59.81 is specifically for toxic effect of smoke. Related codes cover effects of hexamethylene diisocyanate (T59.82) and effect of other specified gases, fumes and vapors (T59.89).

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.

The conditions in its Excludes2 note aren't part of T59.81, but may be coded alongside it if the patient has both: toxic effect of cigarette (tobacco) smoke (T65.22-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.