2026 ICD-10-CM Diagnosis Code S31.12ASLaceration with foreign body of abdominal wall unspecified flank without penetration into peritoneal cavity, sequela

ICD-10-CM Codes›S00–T88›S30-S39›S31

ICD-10-CM S31.12AS
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S31.12AS is a billable ICD-10-CM diagnosis code for laceration with foreign body of abdominal wall unspecified flank without penetration into peritoneal cavity, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 604 through 605. The code is exempt from POA reporting.

Code Identity

ICD-10-CM Code
S31.12AS
Billable Status
Yes — Valid for Submission
Code Describes
Laceration with foreign body of abdominal wall unspecified flank without penetration into peritoneal cavity, sequela
Short Description
Lac with fb of abd wall unsp flank w/o penet perit cav, sqla
Parent Code
S31.12A
Laceration with foreign body of abdominal wall unspecified flank without penetration into peritoneal cavity

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS30-S39Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
CategoryS31Open wound of abdomen, lower back, pelvis and external genitals
This CodeS31.12ASLaceration with foreign body of abdominal wall unspecified flank without penetration into peritoneal cavity, sequela

Present on Admission (POA)Billing

S31.12AS is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Open wound of abdomen, lower back, pelvis and external genitals (S31). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Code History & ChangesHistory

New Code S31.12AS was added to the ICD-10-CM code set for FY 2026, effective October 1, 2025.

Replacement S31.12AS replaces the following previously assigned code(s):

  • S31.129S - Lacerat abd wall w fb, unsp q w/o penet perit cav, sequela
FY 2026AddedAdded to the ICD-10-CM code setEffective October 1, 2025.
FY 2026CurrentRevised in the current code setEffective October 1, 2025 through September 30, 2026.

Questions About S31.12ASOverview

Is S31.12AS a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report laceration with foreign body of abdominal wall unspecified flank without penetration into peritoneal cavity, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in S31.12AS mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the laceration with foreign body of abdominal wall unspecified flank without penetration into peritoneal cavity itself has resolved, not the original event.

What MS-DRG does S31.12AS group to?

When laceration with foreign body of abdominal wall unspecified flank without penetration into peritoneal cavity, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, with relative weights from 0.9160 to 1.4721 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S31.12AS exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for laceration with foreign body of abdominal wall unspecified flank without penetration into peritoneal cavity, sequela on inpatient claims.