S01.90Unspecified open wound of unspecified part of head

S01.90 is the ICD-10-CM diagnosis code for unspecified open wound of unspecified part of head. It belongs to category S01 (open wound of head), block S00-S09 (injuries to the head) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within S01.9, choose S01.90 (Unspecified open wound of unspecified part of head) only when documentation doesn't support a more specific option: laceration without foreign body of unspecified part of head (S01.91), laceration with foreign body of unspecified part of head (S01.92), puncture wound without foreign body of unspecified part of head (S01.93), puncture wound with foreign body of unspecified part of head (S01.94) and open bite of unspecified part of head (S01.95).

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.