ICD-10-CM > S00-T88 > S80-S89 > S80 > S80.8 > S80.82 > S80.821 S80.821 Blister (nonthermal), right lower leg Non-Billable/Non-Specific Codes S80.821A..., initial encounterS80.821D..., subsequent encounterS80.821S..., sequela