S15.001A — Unspecified injury of right carotid artery, initial encounter
S15.001A is a billable, specific ICD-10-CM code for unspecified injury of right carotid artery, 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 S15
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes1 inherited from the categories above S15.001A
These are not written on S15.001A, but they bind it: a note on a category applies to every code beneath it. Billing S15.001A with anything listed here is a denial.
Other codes that can never be billed with S15.001A
These codes carry an Excludes1 note pointing at S15.001A. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading S15.001A alone.
- S09.0Injury of blood vessels of head, not elsewhere classified
- S09.0XXAInjury of blood vessels of head, not elsewhere classified, initial encounter
- S09.0XXDInjury of blood vessels of head, not elsewhere classified, subsequent encounter
- S09.0XXSInjury of blood vessels of head, not elsewhere classified, sequela
Risk adjustment
S15.001A 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
S15.001A is named in 7 Medicare coverage policies — 7 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56631Billing and Coding: Thoracic Aortography and Carotid, Vertebral, and Subclavian Angiography
- A56697Billing and Coding: Non-Invasive Vascular Studies
- A56775Billing and Coding: Magnetic Resonance Angiography
- A56805Billing and Coding: Magnetic Resonance Angiography (MRA)
Code history
S15.001A 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 S15.001. If S15.001A is not quite right, the correct code is usually one of these.
Questions about S15.001A
- Is S15.001A a billable ICD-10-CM code?
- Yes. S15.001A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does S15.001A sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the neck (S10-S19).
- What cannot be coded together with S15.001A?
- S15.001A 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 S15.001A (S15.0) and apply to it just the same.