ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.7 > T22.73 > T22.731 T22.731 Corrosion of third degree of right upper arm Non-Billable/Non-Specific Codes T22.731A..., initial encounterT22.731D..., subsequent encounterT22.731S..., sequela