S90.522Non-Billable (Header)Blister (nonthermal), left ankleCode Hierarchy└S90Superficial injury of ankle, foot and toes└S90.5Other superficial injuries of ankle└S90.52Blister (nonthermal) of ankle└S90.522Blister (nonthermal), left ankle└S90.522Blister (nonthermal), left ankle