W20.1Struck by object due to collapse of building

W20.1 is the ICD-10-CM diagnosis code for struck by object due to collapse of building. It belongs to category W20 (struck by thrown, projected or falling object), block W20-W49 (exposure to inanimate mechanical forces) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within W20 (struck by thrown, projected or falling object), W20.1 is specifically for struck by object due to collapse of building. Related codes cover struck by falling object in cave-in (W20.0) and other cause of strike by thrown, projected or falling object (W20.8).

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.

Don't report W20.1 together with the conditions in its Excludes1 note: struck by object due to collapse of burning building (X00.2, X02.2).

Code first any associated: cataclysm (X34-X39) and lightning strike (T75.00).

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