ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.3 > S20.32 > S20.329 S20.329 Blister (nonthermal) of unspecified front wall of thorax Non-Billable/Non-Specific Codes S20.329A..., initial encounterS20.329D..., subsequent encounterS20.329S..., sequela