ICD-10-CM > S00-T88 > T20-T25 > T21 > T21.6 > T21.60 T21.60 Corrosion of second degree of trunk, unspecified site Non-Billable/Non-Specific Codes T21.60XA..., initial encounterT21.60XD..., subsequent encounterT21.60XS..., sequela