2026 ICD-10-CM Diagnosis Code S31.609SUnspecified open wound of abdominal wall, unspecified quadrant with penetration into peritoneal cavity, sequela

ICD-10-CM Codes›S00–T88›S30-S39›S31

ICD-10-CM S31.609S
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S31.609S is a billable ICD-10-CM diagnosis code for unspecified open wound of abdominal wall, unspecified quadrant with 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.

Code Identity

ICD-10-CM Code
S31.609S
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified open wound of abdominal wall, unspecified quadrant with penetration into peritoneal cavity, sequela
Short Description
Unsp opn wnd abd wall, unsp q w penet perit cav, sequela
Parent Code
S31.609
Unspecified open wound of abdominal wall, unspecified quadrant with 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 CodeS31.609SUnspecified open wound of abdominal wall, unspecified quadrant with penetration into peritoneal cavity, sequela

Present on Admission (POA)Billing

S31.609S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bile duct injury with open wound into cavity
  • Capsular tear of spleen
  • Capsular tear without major disruption of parenchyma of spleen AND with open wound in abdominal cavity
  • Complete disruption of kidney parenchyma with open wound into cavity
  • Contusion of liver
  • Crushing injury of abdomen
  • Fallopian tube injury with open wound into cavity
  • Gunshot wound of abdomen region
  • Hematoma and contusion of liver
  • Hematoma AND contusion of liver with open wound into abdominal cavity
  • Hematoma of kidney
  • Hematoma of kidney without rupture of capsule AND with open wound into abdominal cavity
  • Hematoma of spleen with open wound into abdominal cavity
  • Hemorrhage of kidney
  • Injury of adrenal gland
  • Injury of adrenal gland with open wound into abdominal cavity
  • Injury of ascending colon
  • Injury of ascending right colon with open wound into abdominal cavity
  • Injury of bile duct
  • Injury of colon with open wound into abdominal cavity
  • Injury of descending colon
  • Injury of descending left colon with open wound into abdominal cavity
  • Injury of duodenum with open wound into abdominal cavity
  • Injury of gallbladder with open wound into abdominal cavity
  • Injury of gastrointestinal tract with open wound into abdominal cavity
  • Injury of head of pancreas with open wound into abdominal cavity
  • Injury of intestine with open wound into abdominal cavity
  • Injury of kidney with open wound into abdominal cavity
  • Injury of liver with open wound into abdominal cavity
  • Injury of multiple intra-abdominal organs with open wound into abdominal cavity
  • Injury of multiple pelvic organs
  • Injury of multiple pelvic organs with open wound into cavity
  • Injury of multiple sites of colorectum with open wound into abdominal cavity
  • Injury of multiple sites of pancreas with open wound into abdominal cavity
  • Injury of ovary with open wound into abdominal cavity
  • Injury of prostate
  • Injury of prostate with open wound into abdominal cavity
  • Injury of seminal vesicle
  • Injury of seminal vesicle with open wound into abdominal cavity
  • Injury of sigmoid colon
  • Injury of sigmoid colon with open wound into abdominal cavity
  • Injury of small intestine with open wound into abdominal cavity
  • Injury of spermatic cord
  • Injury of spleen with open wound into abdominal cavity
  • Injury of stomach with open wound into abdominal cavity
  • Injury of transverse colon
  • Injury of transverse colon with open wound into abdominal cavity
  • Injury of ureter with open wound into abdominal cavity
  • Injury of urinary bladder and urethra
  • Injury of urinary bladder and urethra with open wound into abdominal cavity
  • Injury of uterus with open wound into abdominal cavity
  • Injury of vas deferens
  • Injury of vas deferens with open wound into abdominal cavity
  • Internal injury of abdominal organs with open wound into cavity
  • Kidney hematoma without rupture of capsule, with open wound into cavity
  • Laceration extending into parenchyma of spleen with open wound into abdominal cavity
  • Laceration of kidney
  • Laceration of kidney with open wound into abdominal cavity
  • Laceration of liver with open wound into abdominal cavity
  • Laceration of parenchyma of spleen
  • Laceration of spleen
  • Liver hematoma
  • Liver moderate laceration with open wound into cavity
  • Major laceration of liver with open wound into abdominal cavity
  • Massive parenchymal disruption of spleen with open wound into abdominal cavity
  • Minor laceration of liver with open wound into abdominal cavity
  • Moderate laceration of liver with open wound into abdominal cavity
  • Multiple injuries of digestive system
  • Multiple injuries of intestine
  • Multiple injuries of pelvis
  • Multiple injuries to colon or rectum with open wound into cavity
  • Multiple open fractures of pelvis with disruption of pelvic circle
  • Open injury of kidney
  • Open injury of kidney grade I
  • Open injury of kidney grade II
  • Open injury of kidney grade III
  • Open injury of kidney grade IV
  • Open injury of kidney grade V
  • Open injury of spleen
  • Open injury of urinary bladder
  • Open injury of uterus
  • Pancreas body injury with open wound into cavity
  • Pelvic organ injury with open wound into abdominal cavity
  • Penetrating wound of abdomen
  • Peritoneum injury with open wound into cavity
  • Retroperitoneum injury with open wound into cavity
  • Severe crushing injury of abdominal organs
  • Severe crushing injury of abdominal organs with open wound into cavity
  • Spleen injury with hematoma without rupture of capsule, with open wound into cavity
  • Splenic hematoma
  • Splenic hemorrhage
  • Stellate laceration of liver with open wound into abdominal cavity
  • Traumatic hemorrhage of liver
  • Traumatic injury of body of pancreas
  • Traumatic injury of head of pancreas
  • Traumatic retroperitoneal hematoma

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.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ073
Injury, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Wounds and Injuries

An injury is damage to your body. It is a general term that refers to harm caused by accidents, falls, hits, weapons, and more. In the U.S., millions of people injure themselves every year. These injuries range from minor to life-threatening.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert S31.609S to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
906.0 Lt eff opn wnd head/trnk
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replaced This code was replaced in the FY 2026 code set by:

  • S31.606S - Unsp opn wnd abd wall, r flank with penet perit cav, sqla
  • S31.606S - Unsp opn wnd abd wall, r flank with penet perit cav, sqla
  • S31.607S - Unsp opn wnd abd wall, left flank with penet perit cav, sqla
  • S31.607S - Unsp opn wnd abd wall, left flank with penet perit cav, sqla
  • S31.60AS - Unsp opn wnd abd wall, unsp flank with penet perit cav, sqla
  • S31.60AS - Unsp opn wnd abd wall, unsp flank with penet perit cav, sqla
FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S31.609SOverview

Is S31.609S a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified open wound of abdominal wall, unspecified quadrant with penetration into peritoneal cavity, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in S31.609S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the unspecified open wound of abdominal wall, unspecified quadrant with penetration into peritoneal cavity itself has resolved, not the original event.

What MS-DRG does S31.609S group to?

When unspecified open wound of abdominal wall, unspecified quadrant with 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 S31.609S 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 unspecified open wound of abdominal wall, unspecified quadrant with penetration into peritoneal cavity, sequela on inpatient claims.

What is the ICD-9 equivalent of S31.609S?

Under the General Equivalence Mappings, unspecified open wound of abdominal wall, unspecified quadrant with penetration into peritoneal cavity, sequela converts to ICD-9-CM 906.0 (lt eff opn wnd head/trnk). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.