Is S09.90XS a billable ICD-10-CM code?

Yes. S09.90XS is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does S09.90XS 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 S09.90XS?

S09.90XS 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 S09.90XS (S09.90) and apply to it just the same.

S09.90XS

S09.90XS — Unspecified injury of head, sequela

Billable / specific codeICD-10-CMPOA exempt

S09.90XS is a billable, specific ICD-10-CM code for unspecified injury of head, sequela. It is valid for submission on a claim.

7th character "S" — sequela

The appropriate 7th character is to be added to each code from category S09

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.

brain injury NOS (S06.9-)
head injury NOS with loss of consciousness (S06.9-)
intracranial injury NOS (S06.9-)

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Head injury NOS

Excludes1 inherited from the categories above S09.90XS

These are not written on S09.90XS, but they bind it: a note on a category applies to every code beneath it. Billing S09.90XS with anything listed here is a denial.

Written on S09.90 — Unspecified injury of head

brain injury NOS (S06.9-)
head injury NOS with loss of consciousness (S06.9-)
intracranial injury NOS (S06.9-)

Risk adjustment

S09.90XS 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.

Medicare coverage

S09.90XS is named in 3 Medicare coverage policies — 3 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56612Billing and Coding: CT of the Head
A57063Billing and Coding: Diagnostic and Therapeutic Esophagogastroduodenoscopy
A57204Billing and Coding: MRI and CT Scans of the Head and Neck

Code history

S09.90XS has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share S09.90. If S09.90XS is not quite right, the correct code is usually one of these.

Questions about S09.90XS

Is S09.90XS a billable ICD-10-CM code?: Yes. S09.90XS is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does S09.90XS 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 S09.90XS?: S09.90XS 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 S09.90XS (S09.90) and apply to it just the same.