ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.4 > S20.45 > S20.459 S20.459 Superficial foreign body of unspecified back wall of thorax Non-Billable/Non-Specific Codes S20.459A..., initial encounterS20.459D..., subsequent encounterS20.459S..., sequela