ICD-10-CM > S00-T88 > T20-T25 > T21 > T21.4 > T21.42 T21.42 Corrosion of unspecified degree of abdominal wall Non-Billable/Non-Specific Applicable To Corrosion of unspecified degree of flankCorrosion of unspecified degree of groin Codes T21.42XA..., initial encounterT21.42XD..., subsequent encounterT21.42XS..., sequela