ICD-10-CM > S00-T88 > S90-S99 > S90 > S90.4 > S90.42 > S90.426 S90.426 Blister (nonthermal), unspecified lesser toe(s) Non-Billable/Non-Specific Codes S90.426A..., initial encounterS90.426D..., subsequent encounterS90.426S..., sequela