ICD-10-CM > S00-T88 > T20-T25 > T20 > T20.6 > T20.69 T20.69 Corrosion of second degree of multiple sites of head, face, and neck Non-Billable/Non-Specific Codes T20.69XA..., initial encounterT20.69XD..., subsequent encounterT20.69XS..., sequela