W51Accidental striking against or bumped into by another person

W51 is the ICD-10-CM diagnosis code for accidental striking against or bumped into by another person. It belongs to block W50-W64 (exposure to animate 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.

To report this condition, pick the subcode that matches the documentation: W51.XXXA (initial encounter), W51.XXXD (subsequent encounter) and W51.XXXS (sequela).

Don't report W51 together with the conditions in its Excludes1 note: assault by striking against or bumping into by another person (Y04.2) and fall due to collision with another person (W03).

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