ICD-10-CM > L00-L99 > L00-L08 > L02 > L02.2 > L02.22 L02.22 Furuncle of trunk Non-Billable/Non-Specific Applicable To Boil of trunkFolliculitis of trunk Codes L02.221Furuncle of abdominal wallL02.222Furuncle of back [any part, except buttock and flank]L02.223Furuncle of chest wallL02.224Furuncle of groinL02.225Furuncle of perineumL02.226Furuncle of umbilicusL02.227Furuncle of flankL02.229Furuncle of trunk, unspecified