ICD-10-CM > S00-T88 > S90-S99 > S90 > S90.8 > S90.82 > S90.829 S90.829 Blister (nonthermal), unspecified foot Non-Billable/Non-Specific Codes S90.829A..., initial encounterS90.829D..., subsequent encounterS90.829S..., sequela