2026 ICD-10-CM Diagnosis Code S06.81ASInjury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness status unknown, sequela

ICD-10-CM Codes›S00–T88›S00-S09›S06

ICD-10-CM S06.81AS
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S06.81AS is a billable ICD-10-CM diagnosis code for injury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness status unknown, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is exempt from POA reporting. Coders also document this condition as carotid cavernous fistula. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.

Code Identity

ICD-10-CM Code
S06.81AS
Billable Status
Yes — Valid for Submission
Code Describes
Injury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness status unknown, sequela
Short Description
Inj r int crtd, intcrn portion, NEC LOC status unknown, sqla
Parent Code
S06.81A
Injury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness status unknown

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS06Intracranial injury
This CodeS06.81ASInjury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness status unknown, sequela

Present on Admission (POA)Billing

S06.81AS is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Carotid cavernous fistula
  • Injury of internal carotid artery
  • Right carotid artery injury
  • Traumatic carotid cavernous fistula
  • Traumatic right carotid cavernous fistula

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Intracranial injury (S06). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ073
Injury, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement S06.81AS replaces the following previously assigned code(s):

  • S06.819S - Inj r int carotid, intcr w LOC of unsp duration, sequela
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S06.81ASOverview

Is S06.81AS a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report injury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness status unknown, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in S06.81AS mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the injury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness status unknown itself has resolved, not the original event.

Is S06.81AS exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for injury of right internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness status unknown, sequela on inpatient claims.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.