S31.646Puncture wound of abdominal wall with foreign body, right flank with penetration into peritoneal cavity

S31.646 is the ICD-10-CM diagnosis code for puncture wound of abdominal wall with foreign body, right flank with penetration into peritoneal cavity. 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 S31.64 (puncture wound with foreign body of abdominal wall with penetration into peritoneal cavity), S31.646 is specifically for puncture wound of abdominal wall with foreign body, right flank with penetration into peritoneal cavity. Related codes cover with foreign body of abdominal wall, right upper quadrant with penetration into peritoneal cavity (S31.640), with foreign body of abdominal wall, left upper quadrant with penetration into peritoneal cavity (S31.641), with foreign body of abdominal wall, epigastric region with penetration into peritoneal cavity (S31.642), with foreign body of abdominal wall, right lower quadrant with penetration into peritoneal cavity (S31.643), with foreign body of abdominal wall, left lower quadrant with penetration into peritoneal cavity (S31.644), with foreign body of abdominal wall, periumbilic region with penetration into peritoneal cavity (S31.645), of abdominal wall with foreign body, left flank with penetration into peritoneal cavity (S31.647), with foreign body of abdominal wall, unspecified quadrant with penetration into peritoneal cavity (S31.649) and 1 more.

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 was added in FY2026, effective October 1, 2025.