ICD-10-CM > S00-T88 > T20-T25 > T21 > T21.4 > T21.41 T21.41 Corrosion of unspecified degree of chest wall Non-Billable/Non-Specific Applicable To Corrosion of unspecified degree of breast Codes T21.41XA..., initial encounterT21.41XD..., subsequent encounterT21.41XS..., sequela