ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.3 > S20.34 > S20.341 S20.341 External constriction of right front wall of thorax Non-Billable/Non-Specific Codes S20.341A..., initial encounterS20.341D..., subsequent encounterS20.341S..., sequela