ICD-10-CM > S00-T88 > S00-S09 > S06 > S06.0 > S06.0X > S06.0X9 S06.0X9 Concussion with loss of consciousness of unspecified duration Non-Billable/Non-Specific Codes S06.0X9A..., initial encounterS06.0X9D..., subsequent encounterS06.0X9S..., sequela