ICD-10-CM > S00-T88 > T20-T25 > T21 > T21.6 > T21.61 T21.61 Corrosion of second degree of chest wall Non-Billable/Non-Specific Applicable To Corrosion of second degree of breast Codes T21.61XA..., initial encounterT21.61XD..., subsequent encounterT21.61XS..., sequela