2027 ICD-10-CM Diagnosis Code S31.000DUnspecified open wound of lower back and pelvis without penetration into retroperitoneum, subsequent encounter

ICD-10-CM Codes›S00–T88›S30-S39›S31

ICD-10-CM S31.000D
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S31.000D is a billable ICD-10-CM diagnosis code for unspecified open wound of lower back and pelvis without penetration into retroperitoneum, subsequent encounter. The 7th character D marks it as a subsequent encounter code, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds of trunk, subsequent encounter.

Code Identity

ICD-10-CM Code
S31.000D
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified open wound of lower back and pelvis without penetration into retroperitoneum, subsequent encounter
Short Description
Unsp opn wnd low back and pelv w/o penet retroperiton, subs
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 CodeS31.000DUnspecified open wound of lower back and pelvis without penetration into retroperitoneum, subsequent encounter

Present on Admission (POA)Billing

S31.000D is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals (S30-S39).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • 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 ischium
  • 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 avulsion fracture of anterior superior iliac spine
  • Open avulsion fracture of left anterior superior iliac spine
  • Open avulsion fracture of right anterior superior iliac spine
  • 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 and posterior column of acetabulum
  • Open fracture of anterior column and posterior column of left acetabulum
  • Open fracture of anterior column and posterior column of right acetabulum
  • Open fracture of anterior column of left acetabulum
  • Open fracture of anterior column of right acetabulum
  • Open fracture of anterior wall of acetabulum
  • Open fracture of anterior wall of left acetabulum
  • Open fracture of anterior wall 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 ischium
  • Open fracture of left acetabulum
  • Open fracture of left ischium
  • 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 medial wall of acetabulum
  • Open fracture of medial wall of left acetabulum
  • Open fracture of medial wall of right acetabulum
  • Open fracture of posterior column of left acetabulum
  • Open fracture of posterior column of right acetabulum
  • Open fracture of posterior wall of acetabulum
  • Open fracture of posterior wall of left acetabulum
  • Open fracture of posterior wall of right acetabulum
  • Open fracture of pubic ramus
  • Open fracture of pubis
  • Open fracture of right acetabulum
  • Open fracture of right ischium
  • Open fracture of right pubis
  • Open fracture of roof of acetabulum
  • Open fracture of roof of left acetabulum
  • Open fracture of roof of right acetabulum
  • 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 transverse and posterior wall fracture of acetabulum
  • Open transverse and posterior wall fracture of left acetabulum
  • Open transverse and posterior wall fracture of right acetabulum
  • Open transverse fracture of acetabulum
  • Open transverse fracture of left acetabulum
  • Open transverse fracture of right acetabulum
  • 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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to S31.000D: its own notes plus those printed at S31, block S30-S39, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block S30-S39 Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals applies to 2,679 codes
  • 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

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From S31 Open wound of abdomen, lower back, pelvis and external genitals applies to 558 codes
  • traumatic amputation of part of abdomen, lower back and pelvis (S38.2-, S38.3)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From S31 Open wound of abdomen, lower back, pelvis and external genitals applies to 558 codes
From Block S30-S39 Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals applies to 2,679 codes
  • 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)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From S31 Open wound of abdomen, lower back, pelvis and external genitals applies to 558 codes

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From S31 Open wound of abdomen, lower back, pelvis and external genitals applies to 558 codes
  • The appropriate 7th character is to be added to each code from category S31
Values for category S31 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter this code
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name S31.000D, its category, or a range that includes it.

Use Additional Code 1

These codes say to use an additional code from the note, and S31.000D is one of the codes named.

  • S38.1 Crushing injury of abdomen, lower back, and pelvis
    open wound of abdominal wall (S31.-) names S31.-, which includes this code

Code Also 6

These codes say S31.000D may also be needed to fully describe the condition. The note gives no sequencing direction.

  • S33.1 Subluxation and dislocation of lumbar vertebra
    open wound of abdomen, lower back and pelvis (S31) names S31, which includes this code
  • S34 Injury of lumbar and sacral spinal cord and nerves at abdomen, lower back and pelvis level
    open wound of abdomen, lower back and pelvis (S31.-) names S31.-, which includes this code
  • S35 Injury of blood vessels at abdomen, lower back and pelvis level
    any associated open wound (S31.-) names S31.-, which includes this code
  • S36 Injury of intra-abdominal organs
    any associated open wound (S31.-) names S31.-, which includes this code
  • S37 Injury of urinary and pelvic organs
    any associated open wound (S31.-) names S31.-, which includes this code
  • S39 Other and unspecified injuries of abdomen, lower back, pelvis and external genitals
    any associated open wound (S31.-) names S31.-, which includes this code

Clinical ClassificationClinical

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

CCSR INJ050
Open wounds of trunk, subsequent encounter
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 S31.000D to ICD-9-CMHistory

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

ICD-9-CM
V58.89 Other specfied aftercare
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S31.000DOverview

Is S31.000D 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, subsequent encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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

The final character D marks a subsequent encounter: use it for routine care while the unspecified open wound of lower back and pelvis without penetration into retroperitoneum is healing, after active treatment has ended.

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

When unspecified open wound of lower back and pelvis without penetration into retroperitoneum, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 950, 949, with relative weights from 0.7661 to 1.1231 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S31.000D 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, subsequent encounter on inpatient claims. The code appears in the Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals (S30-S39) range of the CMS exempt list.

Can S31.000D be reported with a code from S38.2?

Not as a rule. The Excludes1 note at S31, which applies to S31.000D, lists "traumatic amputation of part of abdomen, lower back and pelvis (S38.2-, S38.3)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).