S06.826A Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S06.826 with 7th character A (initial encounter).

Applies from S06 Intracranial injury

Includes

• traumatic brain injury

Excludes1 (never code together)

• head injury NOS (S09.90)

Use additional code

• code, if applicable, to identify mild neurocognitive disorders due to known physiological condition (F06.7-)

Code also

• any associated:
• open wound of head (S01.-)
• skull fracture (S02.-)

7th character note

• The appropriate 7th character is to be added to each code from category S06, except as noted below

Notes

• 7th characters D and S do not apply to codes in category S06 with 6th character 7 - death due to brain injury prior to regaining consciousness, or 8 - death due to other cause prior to regaining consciousness.

7th character required

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

Risk adjustment (HCC)

• CMS-HCC V28: HCC 397 — Major Head Injury with Loss of Consciousness > 1 Hour
• CMS-HCC V22: HCC 166 — Severe Head Injury
• ESRD V24: HCC 166

Code annotations containing back-references to S06.826A

Back-references to S06.8

• Type 1 Excludes: S06.9 Unspecified intracranial injury ("conditions classifiable to S06.0- to S06.8-code to specified intracranial injury")
• Type 1 Excludes: S15.0 Injury of carotid artery of neck ("injury of internal carotid artery, intracranial portion (S06.8)")

Back-references to S06

• Code First: F02 Dementia in other diseases classified elsewhere ("traumatic brain injury (S06.-)")
• Code First: F06.7 Mild neurocognitive disorder due to known physiological condition ("traumatic brain injury (S06.-)")
• Code First: F48.2 Pseudobulbar affect ("sequelae of traumatic intracranial injury (S06.-)")
• Type 1 Excludes: G31.84 Mild cognitive impairment of uncertain or unknown etiology ("cognitive impairment due to intracranial or head injury (S06.-)")
• Code Also: G96.00 Cerebrospinal fluid leak, unspecified ("head injury (S00-S09)")
• Code Also: G96.08 Other cranial cerebrospinal fluid leak ("head injury (S00 - S09)")
• Code Also: G96.09 Other spinal cerebrospinal fluid leak ("head injury (S00 - S09)")
• Type 1 Excludes: I69 Sequelae of cerebrovascular disease ("sequelae of traumatic intracranial injury (S06.-)")
• Type 1 Excludes: I69.8 Sequelae of other cerebrovascular diseases ("sequelae of traumatic intracranial injury (S06.-)")
• Type 1 Excludes: I69.9 Sequelae of unspecified cerebrovascular diseases ("sequelae of traumatic intracranial injury (S06.-)")
• Type 1 Excludes: P52 Intracranial nontraumatic hemorrhage of newborn ("intracranial hemorrhage due to other injury (S06.-)")
• Code First: R40.2 Coma ("intracranial injury (S06.-)")
• Code Also: S01 Open wound of head ("intracranial injury (S06.-)")
• Code Also: S02 Fracture of skull and facial bones ("any associated intracranial injury (S06.-)")
• Code First: S04 Injury of cranial nerve ("any associated intracranial injury (S06.-)")
• Use Additional: S07 Crushing injury of head ("intracranial injuries (S06.-)")
• Type 1 Excludes: S09.0 Injury of blood vessels of head, not elsewhere classified ("injury of cerebral blood vessels (S06.-)")

Nearby codes

• S06.825 Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours with return to pre-existing conscious level
• S06.825A Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours with return to pre-existing conscious level, initial encounter
• S06.825D Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours with return to pre-existing conscious level, subsequent encounter
• S06.825S Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours with return to pre-existing conscious level, sequela
• S06.826 Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving
• S06.826A Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, initial encounter (this code)
• S06.826D Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, subsequent encounter
• S06.826S Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness greater than 24 hours without return to pre-existing conscious level with patient surviving, sequela
• S06.827 Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness of any duration with death due to brain injury prior to regaining consciousness
• S06.827A Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness of any duration with death due to brain injury prior to regaining consciousness, initial encounter
• S06.828 Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness of any duration with death due to other cause prior to regaining consciousness