2026 ICD-10-CM Diagnosis Code S31Open wound of abdomen, lower back, pelvis and external genitals

ICD-10-CM Codes›S00–T88›S30-S39›S31

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

S31 is a non-billable ICD-10-CM category code for open wound of abdomen, lower back, pelvis and external genitals, so it cannot be submitted on claims. Use a more specific code from this category instead, such as S31.000A, S31.000D, S31.000S, and S31.001A.

Code Identity

ICD-10-CM Code
S31
Billable Status
No — Non-Billable Category
Code Describes
Open wound of abdomen, lower back, pelvis and external genitals
Short Description
Opn wnd abdomen, lower back, pelvis and external genitals
Chapter
S30-S39
Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals

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 CodeS31Open wound of abdomen, lower back, pelvis and external genitals

Specific Coding for Opn wnd abdomen, lower back, pelvis and external genitalsOverview

Non-specific codes like S31 require more characters. Use one of these billable codes instead:

  • S31.0 for Open wound of lower back and pelvis

  • S31.00 for Unspecified open wound of lower back and pelvis

  • S31.01 for Laceration without foreign body of lower back and pelvis

  • S31.02 for Laceration with foreign body of lower back and pelvis

  • S31.03 for Puncture wound without foreign body of lower back and pelvis

  • S31.04 for Puncture wound with foreign body of lower back and pelvis

  • S31.05 for Open bite of lower back and pelvis

  • S31.1 for Open wound of abdominal wall without penetration into peritoneal cavity

  • S31.10 for Unspecified open wound of abdominal wall without penetration into peritoneal cavity

  • S31.11 for Laceration without foreign body of abdominal wall without penetration into peritoneal cavity

  • S31.12 for Laceration with foreign body of abdominal wall without penetration into peritoneal cavity

  • S31.13 for Puncture wound of abdominal wall without foreign body without penetration into peritoneal cavity

  • S31.14 for Puncture wound of abdominal wall with foreign body without penetration into peritoneal cavity

  • S31.15 for Open bite of abdominal wall without penetration into peritoneal cavity

  • S31.2 for Open wound of penis

  • S31.20 for Unspecified open wound of penis

  • S31.21 for Laceration without foreign body of penis

  • S31.22 for Laceration with foreign body of penis

  • S31.23 for Puncture wound without foreign body of penis

  • S31.24 for Puncture wound with foreign body of penis

  • S31.25 for Open bite of penis

  • S31.3 for Open wound of scrotum and testes

  • S31.30 for Unspecified open wound of scrotum and testes

  • S31.31 for Laceration without foreign body of scrotum and testes

  • S31.32 for Laceration with foreign body of scrotum and testes

  • S31.33 for Puncture wound without foreign body of scrotum and testes

  • S31.34 for Puncture wound with foreign body of scrotum and testes

  • S31.35 for Open bite of scrotum and testes

  • S31.4 for Open wound of vagina and vulva

  • S31.40 for Unspecified open wound of vagina and vulva

  • S31.41 for Laceration without foreign body of vagina and vulva

  • S31.42 for Laceration with foreign body of vagina and vulva

  • S31.43 for Puncture wound without foreign body of vagina and vulva

  • S31.44 for Puncture wound with foreign body of vagina and vulva

  • S31.45 for Open bite of vagina and vulva

  • S31.5 for Open wound of unspecified external genital organs

  • S31.50 for Unspecified open wound of unspecified external genital organs

  • S31.51 for Laceration without foreign body of unspecified external genital organs

  • S31.52 for Laceration with foreign body of unspecified external genital organs

  • S31.53 for Puncture wound without foreign body of unspecified external genital organs

  • S31.54 for Puncture wound with foreign body of unspecified external genital organs

  • S31.55 for Open bite of unspecified external genital organs

  • S31.6 for Open wound of abdominal wall with penetration into peritoneal cavity

  • S31.60 for Unspecified open wound of abdominal wall with penetration into peritoneal cavity

  • S31.61 for Laceration without foreign body of abdominal wall with penetration into peritoneal cavity

  • S31.62 for Laceration with foreign body of abdominal wall with penetration into peritoneal cavity

  • S31.63 for Puncture wound without foreign body of abdominal wall with penetration into peritoneal cavity

  • S31.64 for Puncture wound with foreign body of abdominal wall with penetration into peritoneal cavity

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

  • S31.8 for Open wound of other parts of abdomen, lower back and pelvis

  • S31.80 for Open wound of unspecified buttock

  • S31.81 for Open wound of right buttock

  • S31.82 for Open wound of left buttock

  • S31.83 for Open wound of anus

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.

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Code Also

Type 1 Excludes

  • traumatic amputation of part of abdomen, lower back and pelvis S38.2 S38.3

Type 2 Excludes

7th Character Note

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

7th Character

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

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.

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 S31Overview

Is S31 a billable code?

No. This is a category header that groups the codes for open wound of abdomen, lower back, pelvis and external genitals, and headers cannot be submitted on claims. Claims for open wound of abdomen, lower back, pelvis and external genitals need a more specific code from this category, such as S31.000A, S31.000D, and S31.000S.