Is S00 a billable ICD-10-CM code?

No. S00 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does S00 sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the head (S00-S09).

What cannot be coded together with S00?

S00 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

S00

S00 — Superficial injury of head

Non-billable headerICD-10-CM

S00 is a non-billable header ICD-10-CM code for superficial injury of head. 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 S00

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.

diffuse cerebral contusion (S06.2-)
focal cerebral contusion (S06.3-)
injury of eye and orbit (S05.-)
open wound of head (S01.-)

Other codes that can never be billed with S00

These codes carry an Excludes1 note pointing at S00. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading S00 alone.

S01.05Open bite of scalp
S01.05XAOpen bite of scalp, initial encounter
S01.05XDOpen bite of scalp, subsequent encounter
S01.05XSOpen bite of scalp, sequela
S01.15Open bite of eyelid and periocular area
S01.25Open bite of nose
S01.25XAOpen bite of nose, initial encounter
S01.25XDOpen bite of nose, subsequent encounter

Risk adjustment

S00 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 S00

8 child codes. Green means billable.

Questions about S00

Is S00 a billable ICD-10-CM code?: No. S00 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does S00 sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the head (S00-S09).
What cannot be coded together with S00?: S00 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.