X00Exposure to uncontrolled fire in building or structure

X00 is the ICD-10-CM diagnosis code for exposure to uncontrolled fire in building or structure. It belongs to block X00-X08 (exposure to smoke, fire and flames) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: X00.0 (structure), X00.1 (structure), X00.2 (fire), X00.3 (fire), X00.4 (fire), X00.5 (fire) and X00.8 (structure).

The conditions in its Excludes2 note aren't part of X00, but may be coded alongside it if the patient has both: Exposure to ignition or melting of nightwear (X05), Exposure to ignition or melting of other clothing and apparel (X06.-) and Exposure to other specified smoke, fire and flames (X08.-).

Code first: any associated cataclysm.

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