ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.4 > S20.44 > S20.441 S20.441 External constriction of right back wall of thorax Non-Billable/Non-Specific Codes S20.441A..., initial encounterS20.441D..., subsequent encounterS20.441S..., sequela