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