S31.001 – Unspecified open wound of lower back and pelvis with penetration into retroperitoneum

ICD-10-CM 2027 diagnosis code · Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals

Non-billable header

ICD-10-CM code S31.001

Code: S31.001 (claims format: S31001)
Description: Unspecified open wound of lower back and pelvis with penetration into retroperitoneum
Short description: Unsp opn wnd lower back and pelvis w penet retroperiton
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
Block: S30-S39 Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
Parent codes: S31 › S31.0 › S31.00

Billable codes under S31.001

S31.001 is a header code and cannot be used on claims. Choose the most specific code:

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

S31 – Open wound of abdomen, lower back, pelvis and external genitals

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)

Code also:

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

7th character note:

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

Block S30-S39

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

Excludes2 (not included here):

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)

Index terms for S31.001

Entries in the ICD-10-CM alphabetic index that lead to this code:

Wound, open, back, lower, with penetration into retroperitoneal space

Related codes in S31.00

S31.000 – Unspecified open wound of lower back and pelvis without penetration into retroperitoneumHeader

Frequently asked questions

What is ICD-10 code S31.001?

S31.001 is the ICD-10-CM code for unspecified open wound of lower back and pelvis with penetration into retroperitoneum, in the block S30-S39 (Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals).

Is S31.001 a billable code?

No. S31.001 is a header code with more specific child codes; report one of the billable codes listed above.

What category does S31.001 belong to?

It belongs to category S31 – Open wound of abdomen, lower back, pelvis and external genitals.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.