ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.2 > S21.24 S21.24 Puncture wound with foreign body of back wall of thorax without penetration into thoracic cavity Non-Billable/Non-Specific Codes S21.241Puncture wound with foreign body of right back wall of thorax without penetration into thoracic cavityS21.241A..., initial encounterS21.241D..., subsequent encounterS21.241S..., sequelaS21.242Puncture wound with foreign body of left back wall of thorax without penetration into thoracic cavityS21.242A..., initial encounterS21.242D..., subsequent encounterS21.242S..., sequelaS21.249Puncture wound with foreign body of unspecified back wall of thorax without penetration into thoracic cavityS21.249A..., initial encounterS21.249D..., subsequent encounterS21.249S..., sequela