ICD-10-CM > S00-T88 > T20-T25 > T21 > T21.1 > T21.13 T21.13 Burn of first degree of upper back Non-Billable/Non-Specific Applicable To Burn of first degree of interscapular region Codes T21.13XA..., initial encounterT21.13XD..., subsequent encounterT21.13XS..., sequela