ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.1 > S20.12 > S20.122 S20.122 Blister (nonthermal) of breast, left breast Non-Billable/Non-Specific Codes S20.122A..., initial encounterS20.122D..., subsequent encounterS20.122S..., sequela