ICD-10-CM > S00-T88 > T20-T25 > T21 > T21.4 > T21.49 T21.49 Corrosion of unspecified degree of other site of trunk Non-Billable/Non-Specific Codes T21.49XA..., initial encounterT21.49XD..., subsequent encounterT21.49XS..., sequela