ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.7 > T22.73 > T22.739 T22.739 Corrosion of third degree of unspecified upper arm Non-Billable/Non-Specific Codes T22.739A..., initial encounterT22.739D..., subsequent encounterT22.739S..., sequela