ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.1 > S20.12 > S20.129 S20.129 Blister (nonthermal) of breast, unspecified breast Non-Billable/Non-Specific Codes S20.129A..., initial encounterS20.129D..., subsequent encounterS20.129S..., sequela