ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.6 > T22.64 > T22.649 T22.649 Corrosion of second degree of unspecified axilla Non-Billable/Non-Specific Codes T22.649A..., initial encounterT22.649D..., subsequent encounterT22.649S..., sequela