ICD-10-CM > L00-L99 > L00-L08 > L02 > L02.4 > L02.42 L02.42 Furuncle of limb Non-Billable/Non-Specific Applicable To Boil of limbFolliculitis of limb Codes L02.421Furuncle of right axillaL02.422Furuncle of left axillaL02.423Furuncle of right upper limbL02.424Furuncle of left upper limbL02.425Furuncle of right lower limbL02.426Furuncle of left lower limbL02.429Furuncle of limb, unspecified