ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.1 > T22.13 > T22.139 T22.139 Burn of first degree of unspecified upper arm Non-Billable/Non-Specific Codes T22.139A..., initial encounterT22.139D..., subsequent encounterT22.139S..., sequela