ICD-10-CM > S00-T88 > S00-S09 > S06 > S06.0 > S06.0X > S06.0X0 S06.0X0 Concussion without loss of consciousness Non-Billable/Non-Specific Codes S06.0X0A..., initial encounterS06.0X0D..., subsequent encounterS06.0X0S..., sequela