ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.2 > S21.22 S21.22 Laceration with foreign body of back wall of thorax without penetration into thoracic cavity Non-Billable/Non-Specific Codes S21.221Laceration with foreign body of right back wall of thorax without penetration into thoracic cavityS21.221A..., initial encounterS21.221D..., subsequent encounterS21.221S..., sequelaS21.222Laceration with foreign body of left back wall of thorax without penetration into thoracic cavityS21.222A..., initial encounterS21.222D..., subsequent encounterS21.222S..., sequelaS21.229Laceration with foreign body of unspecified back wall of thorax without penetration into thoracic cavityS21.229A..., initial encounterS21.229D..., subsequent encounterS21.229S..., sequela