S31 is the authoritative medical code for Open wound of abdomen, lower back, pelvis and external genitals. This classification is used in medical billing and clinical recording to specify the clinical criteria for open wound of abdomen, lower back, pelvis and external genitals (ICD-10-CM S31), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Open wound of abdomen, lower back, pelvis and external genitals is a non-billable ICD-10-CM category code S31. A more specific billable subcode must be selected for claims submission. Includes: 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): traumatic amputation of part of abdomen, lower back and pelvis (S38.2-, S38.3). Excludes2 (not included here): open wound of hip (S71.00-S71.02); open fracture of pelvis (S32.1--S32.9 with 7th character B); 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. Code also: any associated:; spinal cord injury (S24.0, S24.1-, S34.0-, S34.1-); wound infection. 7th character: The appropriate 7th character is to be added to each code from category S31.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for S31 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- 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
Conditions that can never be reported with this code; the two are mutually exclusive.
- traumatic amputation of part of abdomen, lower back and pelvis (S38.2-, S38.3)
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- open wound of hip (S71.00-S71.02)
- open fracture of pelvis (S32.1--S32.9 with 7th character B)
- 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
Code Also
Additional codes that may be required to fully describe the encounter.
- any associated:
- spinal cord injury (S24.0, S24.1-, S34.0-, S34.1-)
- wound infection
Frequently Asked Questions (FAQ) & Clinical Guidance
Can S31 be billed directly?
No. S31 (Open wound of abdomen, lower back, pelvis and external genitals) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Does S31 require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category S31; A: initial encounter; D: subsequent encounter; S: sequela.
What can't be coded together with S31?
Per official ICD-10-CM Excludes1 instructions, S31 must not be reported together with: traumatic amputation of part of abdomen, lower back and pelvis (S38.2-, S38.3).
Can S31 be reported alongside related conditions?
Per official ICD-10-CM Excludes2 instructions, S31 and the following are not considered part of each other and may both be reported when both conditions are present: open wound of hip (S71.00-S71.02); open fracture of pelvis (S32.1--S32.9 with 7th character B); burns and corrosions (T20-T32); effects of foreign body in anus and rectum (T18.5).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to S31 in its code family, with their registry titles.
- S31.0 — Open wound of lower back and pelvis
- S31.000 — Unspecified open wound of lower back and pelvis without penetration into retroperitoneum
- S31.000A — Unspecified open wound of lower back and pelvis without penetration into retroperitoneum, initial encounter
- S31.000D — Unspecified open wound of lower back and pelvis without penetration into retroperitoneum, subsequent encounter
- S31.000S — Unspecified open wound of lower back and pelvis without penetration into retroperitoneum, sequela
- S31.001 — Unspecified open wound of lower back and pelvis with penetration into retroperitoneum
- S31.001A — Unspecified open wound of lower back and pelvis with penetration into retroperitoneum, initial encounter
- S31.001D — Unspecified open wound of lower back and pelvis with penetration into retroperitoneum, subsequent encounter
- S31.001S — Unspecified open wound of lower back and pelvis with penetration into retroperitoneum, sequela
- S31.010 — Laceration without foreign body of lower back and pelvis without penetration into retroperitoneum
View all 40 codes in the S31.0 family