ICD-10-CM > S00-T88 > T20-T25 > T20 > T20.5 > T20.50 T20.50 Corrosion of first degree of head, face, and neck, unspecified site Non-Billable/Non-Specific Codes T20.50XA..., initial encounterT20.50XD..., subsequent encounterT20.50XS..., sequela