ICD-10-CM > S00-T88 > T30-T32 > T32 > T32.2 T32.2 Corrosions involving 20-29% of body surface Non-Billable/Non-Specific Codes T32.20Corrosions involving 20-29% of body surface with 0% to 9% third degree corrosionT32.21Corrosions involving 20-29% of body surface with 10-19% third degree corrosionT32.22Corrosions involving 20-29% of body surface with 20-29% third degree corrosion