ICD-10-CM > S00-T88 > T20-T25 > T21 > T21.3 > T21.33 T21.33 Burn of third degree of upper back Non-Billable/Non-Specific Applicable To Burn of third degree of interscapular region Codes T21.33XA..., initial encounterT21.33XD..., subsequent encounterT21.33XS..., sequela