S09.90XA — Unspecified injury of head, initial encounter
S09.90XA is a billable, specific ICD-10-CM code for unspecified injury of head, initial encounter. It is valid for submission on a claim.
7th character "A" — initial encounter
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.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Head injury NOS
Risk adjustment
S09.90XA 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
S09.90XA is named in 5 Medicare coverage policies — 4 listing it as supporting medical necessity, and 1 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A57497Billing and Coding: Chest X-Ray Policynot covered
- 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
Related codes at this level
Codes that share S09.90. If S09.90XA is not quite right, the correct code is usually one of these.
Questions about S09.90XA
- Is S09.90XA a billable ICD-10-CM code?
- Yes. S09.90XA is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does S09.90XA 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 S09.90XA?
- S09.90XA carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.