ICD-10-CM > S00-T88 > S00-S09 > S09 > S09.9 > S09.90 S09.90 Unspecified injury of head Non-Billable/Non-Specific Applicable To Head injury NOS Type 1 Excludes brain injury NOS (S06.9-)head injury NOS with loss of consciousness (S06.9-)intracranial injury NOS (S06.9-) Codes S09.90XA..., initial encounterS09.90XD..., subsequent encounterS09.90XS..., sequela