ICD-10-CM > S00-T88 > T20-T25 > T21 > T21.0 > T21.05 T21.05 Burn of unspecified degree of buttock Non-Billable/Non-Specific Applicable To Burn of unspecified degree of anus Codes T21.05XA..., initial encounterT21.05XD..., subsequent encounterT21.05XS..., sequela