ICD-10-CM > S00-T88 > T20-T25 > T20 > T20.7 > T20.70 T20.70 Corrosion of third degree of head, face, and neck, unspecified site Non-Billable/Non-Specific Codes T20.70XA..., initial encounterT20.70XD..., subsequent encounterT20.70XS..., sequela