ICD-10-CM > S00-T88 > S00-S09 > S06 > S06.8 > S06.81 > S06.816 S06.816 Injury of right 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 Non-Billable/Non-Specific Codes S06.816A..., initial encounterS06.816D..., subsequent encounterS06.816S..., sequela