Is ICD-10-CM code S31 billable?

No, S31 (Open wound of abdomen, lower back, pelvis and external genitals) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code S31 belong to?

S31 belongs to Chapter 19 of the ICD-10-CM tabular list: S00–T88 (Injury, Poisoning and Certain Other Consequences of External Causes).

S31Not billable, use a more specific code below

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

In Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals (S30-S39), chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes

558 billable codes under S31: 66 are an MCC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

Instructional notes

Excludes1: not coded here, use a different code

traumatic amputation of part of abdomen, lower back and pelvis (S38.2-, S38.3)

Excludes2: not included here, code separately if applicable

open wound of hip (S71.00-S71.02)
open fracture of pelvis (S32.1--S32.9 with 7th character B)

Code also: add a code for this too, order depends on the encounter

any associated:
spinal cord injury (S24.0, S24.1-, S34.0-, S34.1-)
wound infection

Also applies, from Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals (S30-S39)

These notes sit on S30-S39 and apply to every code under it, including S31.

Includes: conditions that are coded here

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

Excludes2: not included here, code separately if applicable

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)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers 7th character use and coding of injuries, fractures, burns, drug and toxic effects, abuse and neglect, and complications of care (S00-T88).

Application of 7th Characters in Chapter 19 (page 77)
Coding of Injuries (page 78)
Coding of Traumatic Fractures (page 79)
Coding of Burns and Corrosions (page 80)
Adverse Effects, Poisoning, Underdosing and Toxic Effects (page 82)
Adult and child abuse, neglect and other maltreatment (page 85)
Complications of care (page 85)

Read Section I.C.19 (page 77)

Codes under S31

S31 can't be used on a claim. Pick a billable code below; grey headings group them.

S31 MS-DRGs

As the principal diagnosis, the billable codes under S31 group to these 21 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

DRG 604 Trauma to the Skin, Subcutaneous Tissue and Breast with MCC (242 of 558 codes)
DRG 605 Trauma to the Skin, Subcutaneous Tissue and Breast without MCC (242 of 558 codes)
DRG 949 Aftercare with CC/MCC (186 of 558 codes)
DRG 950 Aftercare without CC/MCC (186 of 558 codes)
DRG 963 Other Multiple Significant Trauma with MCC (186 of 558 codes)
DRG 964 Other Multiple Significant Trauma with CC (186 of 558 codes)
DRG 965 Other Multiple Significant Trauma without CC/MCC (186 of 558 codes)
DRG 393 Other Digestive System Diagnoses with MCC (60 of 558 codes)
DRG 394 Other Digestive System Diagnoses with CC (60 of 558 codes)
DRG 395 Other Digestive System Diagnoses without CC/MCC (60 of 558 codes)
DRG 729 Other Male Reproductive System Diagnoses with CC/MCC (24 of 558 codes)
DRG 730 Other Male Reproductive System Diagnoses without CC/MCC (24 of 558 codes)
DRG 913 Traumatic Injury with MCC (22 of 558 codes)
DRG 914 Traumatic Injury without MCC (22 of 558 codes)
DRG 742 Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC (18 of 558 codes)
DRG 743 Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC (18 of 558 codes)
DRG 760 Menstrual and Other Female Reproductive System Disorders with CC/MCC (18 of 558 codes)
DRG 761 Menstrual and Other Female Reproductive System Disorders without CC/MCC (18 of 558 codes)
DRG 698 Other Kidney and Urinary Tract Diagnoses with MCC (6 of 558 codes)
DRG 699 Other Kidney and Urinary Tract Diagnoses with CC (6 of 558 codes)
DRG 700 Other Kidney and Urinary Tract Diagnoses without CC/MCC (6 of 558 codes)

Other codes that refer to S31

Notes on these codes point to S31.

S33.1 Code Also: open wound of abdomen, lower back and pelvis (S31)
S34 Code Also: open wound of abdomen, lower back and pelvis (S31.-)
S35 Code Also: any associated open wound (S31.-)
S36 Code Also: any associated open wound (S31.-)
S37 Code Also: any associated open wound (S31.-)
S38.1 Use Additional Code: open wound of abdominal wall (S31.-)
S39 Code Also: any associated open wound (S31.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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. Injuries can happen at work or play, indoors or outdoors, driving a car, or walking across the street.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.