2026 ICD-10-CM Diagnosis Code S06.6X9ATraumatic subarachnoid hemorrhage with loss of consciousness of unspecified duration, initial encounter

ICD-10-CM Codes›S00–T88›S00-S09›S06

ICD-10-CM S06.6X9A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S06.6X9A is a billable ICD-10-CM diagnosis code for traumatic subarachnoid hemorrhage with loss of consciousness of unspecified duration, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 963 through 965. Coders also document this condition as cerebrovascular accident with intracranial hemorrhage. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Traumatic brain injury (TBI); concussion, initial encounter.

Code Identity

ICD-10-CM Code
S06.6X9A
Billable Status
Yes — Valid for Submission
Code Describes
Traumatic subarachnoid hemorrhage with loss of consciousness of unspecified duration, initial encounter
Short Description
Traum subrac hem w LOC of unsp duration, init
Parent Code
S06.6X9
Traumatic subarachnoid hemorrhage with loss of consciousness of unspecified duration

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS06Intracranial injury
This CodeS06.6X9ATraumatic subarachnoid hemorrhage with loss of consciousness of unspecified duration, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cerebrovascular accident with intracranial hemorrhage
  • Intracranial hemorrhage following injury with loss of consciousness
  • Intracranial hemorrhage following injury with open intracranial wound AND loss of consciousness
  • Neurovascular injury
  • Subarachnoid hemorrhage due to traumatic injury
  • Subarachnoid hemorrhage following injury with open intracranial wound
  • Subarachnoid hemorrhage following injury with open intracranial wound AND loss of consciousness
  • Traumatic injury of blood vessel of head
  • Traumatic subarachnoid hemorrhage with loss of consciousness

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 INJ008
Traumatic brain injury (TBI); concussion, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Traumatic Brain Injury

Traumatic brain injury (TBI) is a sudden injury that causes damage to the brain. It may happen when there is a blow, bump, or jolt to the head. This is a closed head injury. A TBI can also happen when an object penetrates the skull. This is a penetrating injury.

The full article covers:

  • What is traumatic brain injury (TBI)?
  • What causes traumatic brain injury (TBI)?
  • Who is at risk for traumatic brain injury (TBI)?
  • What are the symptoms of traumatic brain injury (TBI)?
  • How is traumatic brain injury (TBI) diagnosed?
  • What are the treatments for traumatic brain injury (TBI)?
  • Can traumatic brain injury (TBI) be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert S06.6X9A to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
852.06 Subarach hem-coma NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S06.6X9AOverview

Is S06.6X9A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report traumatic subarachnoid hemorrhage with loss of consciousness of unspecified duration, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S06.6X9A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for traumatic subarachnoid hemorrhage with loss of consciousness of unspecified duration, such as an emergency visit or first evaluation.

What MS-DRG does S06.6X9A group to?

When traumatic subarachnoid hemorrhage with loss of consciousness of unspecified duration, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 963, 964, 965, with relative weights from 0.9405 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S06.6X9A?

Under the General Equivalence Mappings, traumatic subarachnoid hemorrhage with loss of consciousness of unspecified duration, initial encounter converts to ICD-9-CM 852.06 (subarach hem-coma NOS). The mapping is approximate, so confirm the match fits the documentation.

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.