ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.3 > S20.32 > S20.323 S20.323 Blister (nonthermal) of bilateral front wall of thorax Non-Billable/Non-Specific Codes S20.323A..., initial encounterS20.323D..., subsequent encounterS20.323S..., sequela