ICD-10-CM > S00-T88 > S90-S99 > S90 > S90.4 > S90.42 > S90.425 S90.425 Blister (nonthermal), left lesser toe(s) Non-Billable/Non-Specific Codes S90.425A..., initial encounterS90.425D..., subsequent encounterS90.425S..., sequela