S00.521Non-Billable (Header)Blister (nonthermal) of lipCode Hierarchy└S00Superficial injury of head└S00.5Superficial injury of lip and oral cavity└S00.52Blister (nonthermal) of lip and oral cavity└S00.521Blister (nonthermal) of lip└S00.521Blister (nonthermal) of lip