ICD-10-CM > S00-T88 > S90-S99 > S90 > S90.8 > S90.82 > S90.821 S90.821 Blister (nonthermal), right foot Non-Billable/Non-Specific Codes S90.821A..., initial encounterS90.821D..., subsequent encounterS90.821S..., sequela