ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.4 > S20.45 S20.45 Superficial foreign body of back wall of thorax Non-Billable/Non-Specific Applicable To Splinter of back wall of thorax Codes S20.451Superficial foreign body of right back wall of thoraxS20.451A..., initial encounterS20.451D..., subsequent encounterS20.451S..., sequelaS20.452Superficial foreign body of left back wall of thoraxS20.452A..., initial encounterS20.452D..., subsequent encounterS20.452S..., sequelaS20.459Superficial foreign body of unspecified back wall of thoraxS20.459A..., initial encounterS20.459D..., subsequent encounterS20.459S..., sequela