2026 ICD-10-CM Diagnosis Code S31.000SUnspecified open wound of lower back and pelvis without penetration into retroperitoneum, sequela

ICD-10-CM S31.000S

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

S31.000S is a billable ICD-10-CM diagnosis code for unspecified open wound of lower back and pelvis without penetration into retroperitoneum, 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

S31.000S

Billable Status

Yes — Valid for Submission

Code Describes

Unspecified open wound of lower back and pelvis without penetration into retroperitoneum, sequela

Short Description

Unsp opn wnd low back and pelv w/o penet retroperiton, sqla

Parent Code

S31.000

Unspecified open wound of lower back and pelvis without penetration into retroperitoneum

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 CodeS31.000SUnspecified open wound of lower back and pelvis without penetration into retroperitoneum, sequela

Present on Admission (POA)Billing

S31.000S 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.

Filter synonyms:

Burst fracture of lumbar vertebra
Central cord syndrome of lumbar spinal cord due to open spinal dislocation
Central cord syndrome of lumbar spinal cord due to open spinal fracture
Central cord syndrome of lumbar spinal cord due to open spinal subluxation
Central cord syndrome of lumbar spinal cord due to traumatic injury
Complete disruption of pelvic ring
Dislocation of symphysis pubis
Fracture dislocation of sacroiliac joint
Fracture of coccyx
Fracture of fifth lumbar vertebra
Fracture of first lumbar vertebra
Fracture of fourth lumbar vertebra
Fracture of inferior pubic ramus
Fracture of lumbar spine with cord lesion
Fracture of multiple pubic rami
Fracture of second lumbar vertebra
Fracture of spinous process of lumbar vertebra
Fracture of superior pubic ramus
Fracture of third lumbar vertebra
Fracture of transverse process of lumbar vertebra
Fractures involving thorax with lower back and pelvis
Fractures involving thorax with lower back and pelvis with limb
Injury of lumbosacral plexus
Multiple open anterior-posterior compression fractures of pelvis with stable pelvic ring
Multiple open anterior-posterior compression fractures of pelvis with unstable pelvic ring
Multiple open fractures of pelvis with disruption of pelvic circle
Multiple open lateral compression fractures of pelvis with stable pelvic ring
Multiple open lateral compression fractures of pelvis with unstable pelvic ring
Multiple open vertical shear fractures of pelvis with unstable pelvic ring
Multiple open wounds of abdomen, lower back and pelvis
Multiple open wounds of lower back
Multiple open wounds of pelvic region
Open avulsion fracture of anterior inferior spine of ilium
Open complete rupture of pelvic ring
Open complete rupture of sacroiliac joint
Open complete rupture pubic symphysis
Open compression fracture sacrum
Open dislocation of coccyx
Open dislocation of lumbar vertebra
Open dislocation of lumbosacral joint
Open dislocation of sacroiliac joint
Open dislocation of sacrum
Open division anterior sacroiliac ligament
Open division iliolumbar ligament
Open division of pubic ligament
Open division pelvic ligament
Open division posterior sacroiliac ligament
Open division sacroiliac ligament
Open division sacrospinous ligament
Open division sacrotuberous ligament
Open division symphysis pubis
Open division, lumbar ligament
Open division, sacrum ligament
Open fracture acetabulum, anterior column
Open fracture dislocation of pelvis
Open fracture dislocation of sacroiliac joint
Open fracture involving thorax with lower back and pelvis and limbs
Open fracture lumbar vertebra
Open fracture lumbar vertebra, burst
Open fracture lumbar vertebra, posterior arch
Open fracture lumbar vertebra, spinous process
Open fracture lumbar vertebra, spondylolysis
Open fracture lumbar vertebra, transverse process
Open fracture lumbar vertebra, tricolumnar
Open fracture of anterior column of left acetabulum
Open fracture of anterior column of right acetabulum
Open fracture of coccyx
Open fracture of fifth lumbar vertebra
Open fracture of first lumbar vertebra
Open fracture of fourth lumbar vertebra
Open fracture of ilium
Open fracture of innominate bone
Open fracture of left acetabulum
Open fracture of left pubis
Open fracture of lumbar spine with incomplete lesion of lumbar spinal cord
Open fracture of lumbar vertebra with spinal cord injury
Open fracture of pubic ramus
Open fracture of pubis
Open fracture of right acetabulum
Open fracture of right pubis
Open fracture of sacrum AND/OR coccyx with cauda equina injury
Open fracture of sacrum AND/OR coccyx with complete cauda equina lesion
Open fracture of sacrum with complete cauda equina lesion
Open fracture of second lumbar vertebra
Open fracture of third lumbar vertebra
Open fracture sacrum
Open fracture subluxation of pelvis
Open injury cauda equina
Open injury pudendal nerve
Open injury sacral plexus
Open Malgaigne fracture
Open spinal dislocation with anterior lumbar cord lesion
Open spinal dislocation with cauda equina lesion
Open spinal dislocation with complete lumbar cord lesion
Open spinal fracture with anterior lumbar cord lesion
Open spinal fracture with cauda equina lesion
Open spinal fracture with complete lumbar cord lesion
Open spinal fracture with posterior lumbar cord lesion
Open spinal subluxation with anterior lumbar cord lesion
Open spinal subluxation with cauda equina lesion
Open spinal subluxation with complete lumbar cord lesion
Open stable fracture of multiple pubic rami
Open subluxation lumbar spine
Open subluxation of coccyx
Open subluxation of sacrum
Open traumatic dislocation of pelvis
Open traumatic subluxation of pelvis
Open unstable fracture of multiple pubic rami
Open vertical fracture of ilium
Open wound of lower back
Open wound of lumbar region
Open wound of pelvic region
Open wound of sacroiliac region
Open wounds involving thorax with abdomen, lower back and pelvis
Posterior cord syndrome of lumbar spinal cord
Posterior cord syndrome of lumbar spinal cord due to open dislocation of lumbar spine
Posterior cord syndrome of lumbar spinal cord due to open subluxation of lumbar spine
Pudendal nerve injury
Pudendal nerve neuropathy
Spinal subluxation with cauda equina lesion
Spinal subluxation with lumbar cord lesion
Subluxation of coccyx
Subluxation of sacrum
Three column fracture of lumbar vertebra
Traumatic amputation of lower back
Traumatic amputation of pelvis
Traumatic dislocation of lumbosacral joint
Traumatic dislocation of sacrococcygeal joint
Traumatic dislocation of sacroiliac joint
Traumatic injury of coccygeal vertebral column region
Traumatic rupture of symphysis pubis
Vertical fracture of ilium

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 S31.000S 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 HistoryHistory

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 S31.000SOverview

Is S31.000S a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified open wound of lower back and pelvis without penetration into retroperitoneum, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in S31.000S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the unspecified open wound of lower back and pelvis without penetration into retroperitoneum itself has resolved, not the original event.

What MS-DRG does S31.000S group to?

When unspecified open wound of lower back and pelvis without penetration into retroperitoneum, 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 S31.000S 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 lower back and pelvis without penetration into retroperitoneum, sequela on inpatient claims.

What is the ICD-9 equivalent of S31.000S?

Under the General Equivalence Mappings, unspecified open wound of lower back and pelvis without penetration into retroperitoneum, 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.

Indicator	Meaning	CMS pays CC/MCC DRG
Y	Diagnosis was present at the time of inpatient admission	Yes
N	Diagnosis was not present at the time of admission	No
U	Documentation is insufficient to determine	No
W	Clinically undetermined	Yes
1	Unreported, exempt from POA reporting	No