ICD-10-CM > S00-T88 > S90-S99 > S90 > S90.5 > S90.52 > S90.522 S90.522 Blister (nonthermal), left ankle Non-Billable/Non-Specific Codes S90.522A..., initial encounterS90.522D..., subsequent encounterS90.522S..., sequela