ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.4 > S21.43 > S21.432 S21.432 Puncture wound without foreign body of left back wall of thorax with penetration into thoracic cavity Non-Billable/Non-Specific Codes S21.432A..., initial encounterS21.432D..., subsequent encounterS21.432S..., sequela