ICD-10-CM > S00-T88 > S90-S99 > S90 > S90.4 > S90.42 > S90.424 S90.424 Blister (nonthermal), right lesser toe(s) Non-Billable/Non-Specific Codes S90.424A..., initial encounterS90.424D..., subsequent encounterS90.424S..., sequela