W31Contact with other and unspecified machinery

W31 is the ICD-10-CM diagnosis code for contact with other and unspecified machinery. It belongs to 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 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: W31.0 (machinery), W31.1 (machines), W31.2 (machines), W31.3 (movers), W31.8 (machinery) and W31.9 (machinery).

Don't report W31 together with the conditions in its Excludes1 note: contact with agricultural machinery (W30.-), contact with machinery in transport under own power or being towed by a vehicle (V01-V99) and exposure to electric current (W86).

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