S31.021Laceration with foreign body of lower back and pelvis with penetration into retroperitoneum

S31.021 is the ICD-10-CM diagnosis code for laceration with foreign body of lower back and pelvis with penetration into retroperitoneum. It belongs to category S31 (open wound of abdomen, lower back, pelvis and external genitals), block S30-S39 (injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals) 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 S31.02 (laceration with foreign body of lower back and pelvis), S31.021 is specifically for laceration with foreign body of lower back and pelvis with penetration into retroperitoneum. Related codes cover without penetration into retroperitoneum (S31.020).

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.