ICD-10-CM > S00-T88 > T20-T25 > T20 > T20.4 > T20.46 T20.46 Corrosion of unspecified degree of forehead and cheek Non-Billable/Non-Specific Codes T20.46XA..., initial encounterT20.46XD..., subsequent encounterT20.46XS..., sequela