ICD-10-CM > S00-T88 > T20-T25 > T21 > T21.1 > T21.11 T21.11 Burn of first degree of chest wall Non-Billable/Non-Specific Applicable To Burn of first degree of breast Codes T21.11XA..., initial encounterT21.11XD..., subsequent encounterT21.11XS..., sequela