ICD-10-CM > S00-T88 > S00-S09 > S00 > S00.4 > S00.42 > S00.429 S00.429 Blister (nonthermal) of unspecified ear Non-Billable/Non-Specific Codes S00.429A..., initial encounterS00.429D..., subsequent encounterS00.429S..., sequela