ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.5 > T22.54 > T22.549 T22.549 Corrosion of first degree of unspecified axilla Non-Billable/Non-Specific Codes T22.549A..., initial encounterT22.549D..., subsequent encounterT22.549S..., sequela