ICD-10-CM > S00-T88 > T20-T25 > T21 > T21.2 > T21.23 T21.23 Burn of second degree of upper back Non-Billable/Non-Specific Applicable To Burn of second degree of interscapular region Codes T21.23XA..., initial encounterT21.23XD..., subsequent encounterT21.23XS..., sequela