ICD-10-CM > S00-T88 > S90-S99 > S90 > S90.8 > S90.82 S90.82 Blister (nonthermal) of foot Non-Billable/Non-Specific Codes S90.821Blister (nonthermal), right footS90.821A..., initial encounterS90.821D..., subsequent encounterS90.821S..., sequelaS90.822Blister (nonthermal), left footS90.822A..., initial encounterS90.822D..., subsequent encounterS90.822S..., sequelaS90.829Blister (nonthermal), unspecified footS90.829A..., initial encounterS90.829D..., subsequent encounterS90.829S..., sequela