Is S31 a billable ICD-10-CM code?

No. S31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does S31 sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals (S30-S39).

What cannot be coded together with S31?

S31 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

S31

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

Non-billable headerICD-10-CM

S31 is a non-billable header ICD-10-CM code for open wound of abdomen, lower back, pelvis and external genitals. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

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

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

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

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

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

Code also

Both codes may be needed to describe the encounter fully. Sequencing depends on the reason for the visit.

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

Other codes that can never be billed with S31

These codes carry an Excludes1 note pointing at S31. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading S31 alone.

S30.87Other superficial bite of abdomen, lower back, pelvis and external genitals

Risk adjustment

S31 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead S31

8 child codes. Green means billable.

Questions about S31

Is S31 a billable ICD-10-CM code?: No. S31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does S31 sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals (S30-S39).
What cannot be coded together with S31?: S31 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.