S06.6X2 Traumatic subarachnoid hemorrhage with loss of consciousness of 31 minutes to 59 minutes

ICD-10-CM S06.6X2: Traumatic subarachnoid hemorrhage with loss of consciousness of 31 minutes to 59 minutes

ICD-10-CM code S06.6X2 identifies a traumatic subarachnoid hemorrhage accompanied by a loss of consciousness lasting 31 to 59 minutes. The terminology is active and classified under an injury or poisoning semantic type. Clinical texts define moderate to severe traumatic brain injury as a loss of consciousness lasting 30 minutes or more, and note that such injuries can result from external mechanical forces. 1 2

Plain-language overview

This diagnosis code represents a traumatic subarachnoid hemorrhage where the patient experiences a loss of consciousness lasting between 31 and 59 minutes. 1

What this code represents

The code S06.6X2 is an active terminology concept with no narrower child concepts, and its parent concept is S06.6X for traumatic subarachnoid hemorrhage. 1

The semantic type assigned to this specific code is Injury or Poisoning within the medical terminology system, and it has a published abbreviation for the condition. 1

Clinical context

A loss of consciousness lasting 31 to 59 minutes falls within the clinical definition of moderate to severe traumatic brain injury, which begins at 30 minutes of unconsciousness. 2

Traumatic brain injuries can result from external mechanical forces, impact, rapid acceleration-deceleration, or penetrating injury to the head, and subarachnoid hemorrhage is a type of closed head injury. 2

Documentation considerations

Clinical evaluations of traumatic brain injury necessitate documenting historical features like the injury mechanism and the precise duration of any loss of consciousness. 2

A brain CT scan is advocated for moderate to severe head injuries to diagnose intracranial emergencies like subarachnoid hemorrhages, and the Rotterdam score grades subarachnoid hemorrhage as absent or present. 2

What the sources add

The terminology record defines the exact 31 to 59 minute unconsciousness duration for this code, while the clinical text separately defines moderate to severe traumatic brain injury as a loss of consciousness lasting 30 minutes or more. 1 2

The CMS definitions manual lists traumatic subarachnoid hemorrhage with loss of consciousness of 31 minutes to 59 minutes as an initial encounter, adding an encounter context to the terminology. 1 4

Sources

1. ICD-10-CM S06.6X2 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. ICD-10-CM/PCS MS-DRG v37.0 Definitions Manual — cms.gov; accessed 2026-07-27.
4. ICD-10-CM/PCS MS-DRG v37.0 Definitions Manual — cms.gov; accessed 2026-07-27.