W45.0Nail entering through skin

W45.0 is the ICD-10-CM diagnosis code for nail entering through skin. It belongs to category W45 (foreign body or object entering through skin), 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 W45 (foreign body or object entering through skin), W45.0 is specifically for nail entering through skin. Related codes cover fishing hook entering through skin (W45.3) and other foreign body or object entering through skin (W45.8).

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.

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