2026 ICD-10-CM Diagnosis Code S06.0X0AConcussion without loss of consciousness, initial encounter

ICD-10-CM Codes›S00–T88›S00-S09›S06

ICD-10-CM S06.0X0A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S06.0X0A is a billable ICD-10-CM diagnosis code for concussion without loss of consciousness, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Traumatic brain injury (TBI); concussion, initial encounter.

Code Identity

ICD-10-CM Code
S06.0X0A
Billable Status
Yes — Valid for Submission
Code Describes
Concussion without loss of consciousness, initial encounter
Short Description
Concussion without loss of consciousness, initial encounter
Same as the full description in the CMS dataset.
Parent Code
S06.0X0
Concussion without loss of consciousness

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS06Intracranial injury
This CodeS06.0X0AConcussion without loss of consciousness, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Brain injury with open intracranial wound AND concussion
  • Brain stem contusion
  • Brain stem contusion with open intracranial wound
  • Brain stem contusion with open intracranial wound AND concussion
  • Cerebellar contusion
  • Cerebellar contusion with open intracranial wound
  • Cerebellar contusion with open intracranial wound AND concussion
  • Concussion cataract
  • Concussion injury of brain
  • Concussion with mental confusion AND/OR disorientation without loss of consciousness
  • Concussion with no loss of consciousness
  • Intracranial hemorrhage following injury with open intracranial wound AND concussion
  • Intracranial subdural hemorrhage following injury with open intracranial wound and concussion
  • Intracranial subdural hemorrhage with open intracranial wound
  • Repeated concussion
  • Subarachnoid hemorrhage due to traumatic injury
  • Subarachnoid hemorrhage following injury with open intracranial wound
  • Subarachnoid hemorrhage following injury with open intracranial wound AND concussion
  • Traumatic brain injury with no loss of consciousness
  • Traumatic intracranial subdural hemorrhage following open wound of head
  • Traumatic subdural intracranial hemorrhage

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

Concussion

A concussion is a type of brain injury. It involves a short loss of normal brain function. It happens when a hit to the head or body causes your head and brain to move rapidly back and forth. This sudden movement can cause the brain to bounce around or twist in the skull, creating chemical changes in your brain.

Read the full article at MedlinePlus

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

Convert S06.0X0A to ICD-9-CMHistory

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

ICD-9-CM
850.0 Concussion w/o coma
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 S06.0X0AOverview

Is S06.0X0A (Concussion without loss of consciousness) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report concussion without loss of consciousness, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S06.0X0A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for concussion without loss of consciousness, such as an emergency visit or first evaluation.

What MS-DRG does S06.0X0A group to?

When concussion without loss of consciousness, 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 S06.0X0A?

Under the General Equivalence Mappings, concussion without loss of consciousness, initial encounter converts to ICD-9-CM 850.0 (concussion w/o coma). 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.