S31.657A – Open bite of abdominal wall, left flank with penetration into peritoneal cavity, initial encounter

ICD-10-CM 2027 diagnosis code · Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals

Billable code

ICD-10-CM code S31.657A

Code: S31.657A (claims format: S31657A)
Description: Open bite of abdominal wall, left flank with penetration into peritoneal cavity, initial encounter
Short description: Open bite of abd wall, left flank with penet perit cav, init
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
Block: S30-S39 Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
Parent codes: S31 › S31.6 › S31.65 › S31.657

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

S31 – Open wound of abdomen, lower back, pelvis and external genitals

Excludes1 (not coded here):

traumatic amputation of part of abdomen, lower back and pelvis (S38.2-, S38.3)

Excludes2 (not included here):

open wound of hip (S71.00-S71.02)
open fracture of pelvis (S32.1--S32.9 with 7th character B)

Code also:

any associated:
spinal cord injury (S24.0, S24.1-, S34.0-, S34.1-)
wound infection

7th character note:

The appropriate 7th character is to be added to each code from category S31

S31.65 – Open bite of abdominal wall with penetration into peritoneal cavity

Excludes1 (not coded here):

superficial bite of abdominal wall (S30.861, S30.871)

Block S30-S39

Includes:

injuries to the abdominal wall
injuries to the anus
injuries to the buttock
injuries to the external genitalia
injuries to the flank
injuries to the groin

Excludes2 (not included here):

burns and corrosions (T20-T32)
effects of foreign body in anus and rectum (T18.5)
effects of foreign body in genitourinary tract (T19.-)
effects of foreign body in stomach, small intestine and colon (T18.2-T18.4)
frostbite (T33-T34)
insect bite or sting, venomous (T63.4)

Related codes in S31.657

Frequently asked questions

What is ICD-10 code S31.657A?

S31.657A is the ICD-10-CM code for open bite of abdominal wall, left flank with penetration into peritoneal cavity, initial encounter, in the block S30-S39 (Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals).

Is S31.657A a billable code?

Yes. S31.657A is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does S31.657A belong to?

It belongs to category S31 – Open wound of abdomen, lower back, pelvis and external genitals.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.