Is S01.9 a billable ICD-10-CM code?

No. S01.9 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does S01.9 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 S01.9?

S01.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above S01.9 (S01) and apply to it just the same.

S01.9

S01.9 — Open wound of unspecified part of head

Non-billable headerICD-10-CM

S01.9 is a non-billable header ICD-10-CM code for open wound of unspecified part 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 S01

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above S01.9

These are not written on S01.9, but they bind it: a note on a category applies to every code beneath it. Billing S01.9 with anything listed here is a denial.

Written on S01 — Open wound of head

open skull fracture (S02.- with 7th character B)

Excludes2 inherited from the categories above S01.9

Also inherited, and the opposite of Excludes1: these conditions are not part of S01.9, but a patient can have both, so you may code both.

Written on S01 — Open wound of head

injury of eye and orbit (S05.-)
traumatic amputation of part of head (S08.-)

Other codes that can never be billed with S01.9

These codes carry an Excludes1 note pointing at S01.9. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading S01.9 alone.

S00Superficial injury of head
S00.97Other superficial bite of unspecified part of head
S00.97XAOther superficial bite of unspecified part of head, initial encounter
S00.97XDOther superficial bite of unspecified part of head, subsequent encounter
S00.97XSOther superficial bite of unspecified part of head, sequela

Risk adjustment

S01.9 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 history

S01.9 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead S01.9

6 child codes. Green means billable.

Related codes at this level

Codes that share S01. If S01.9 is not quite right, the correct code is usually one of these.

Questions about S01.9

Is S01.9 a billable ICD-10-CM code?: No. S01.9 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does S01.9 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 S01.9?: S01.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above S01.9 (S01) and apply to it just the same.