S31.657 — Open bite of abdominal wall, left flank with penetration into peritoneal cavity
S31.657 is a non-billable header ICD-10-CM code for open bite of abdominal wall, left flank with penetration into peritoneal cavity. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to each code from category S31
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes1 inherited from the categories above S31.657
These are not written on S31.657, but they bind it: a note on a category applies to every code beneath it. Billing S31.657 with anything listed here is a denial.
Written on S31.65 — Open bite of abdominal wall with penetration into peritoneal cavity
Excludes2 inherited from the categories above S31.657
Also inherited, and the opposite of Excludes1: these conditions are not part of S31.657, but a patient can have both, so you may code both.
Risk adjustment
S31.657 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
How S31.657 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to S31.657.
- Bite›flank›left›with penetration into peritoneal cavity
Code history
S31.657 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Code to one of these instead S31.657
3 child codes. Green means billable.
- S31.657AOpen bite of abdominal wall, left flank with penetration into peritoneal cavity, initial encounter
- S31.657DOpen bite of abdominal wall, left flank with penetration into peritoneal cavity, subsequent encounter
- S31.657SOpen bite of abdominal wall, left flank with penetration into peritoneal cavity, sequela
Related codes at this level
Codes that share S31.65. If S31.657 is not quite right, the correct code is usually one of these.
- S31.650Open bite of abdominal wall, right upper quadrant with penetration into peritoneal cavity
- S31.651Open bite of abdominal wall, left upper quadrant with penetration into peritoneal cavity
- S31.652Open bite of abdominal wall, epigastric region with penetration into peritoneal cavity
- S31.653Open bite of abdominal wall, right lower quadrant with penetration into peritoneal cavity
- S31.654Open bite of abdominal wall, left lower quadrant with penetration into peritoneal cavity
- S31.655Open bite of abdominal wall, periumbilic region with penetration into peritoneal cavity
- S31.656Open bite of abdominal wall, right flank with penetration into peritoneal cavity
- S31.659Open bite of abdominal wall, unspecified quadrant with penetration into peritoneal cavity
- S31.65AOpen bite of abdominal wall, unspecified flank with penetration into peritoneal cavity
Questions about S31.657
- Is S31.657 a billable ICD-10-CM code?
- No. S31.657 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does S31.657 sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals (S30-S39).
- What cannot be coded together with S31.657?
- S31.657 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above S31.657 (S31.65, S31) and apply to it just the same.