ICD-10-CM > S00-T88 > S00-S09 > S06 > S06.8 > S06.82 > S06.823 S06.823 Injury of left internal carotid artery, intracranial portion, not elsewhere classified with loss of consciousness of 1 hour to 5 hours 59 minutes Non-Billable/Non-Specific Codes S06.823A..., initial encounterS06.823D..., subsequent encounterS06.823S..., sequela