ICD-10-CM > S00-T88 > S90-S99 > S90 > S90.5 > S90.52 > S90.529 S90.529 Blister (nonthermal), unspecified ankle Non-Billable/Non-Specific Codes S90.529A..., initial encounterS90.529D..., subsequent encounterS90.529S..., sequela