ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.4 > S21.45 > S21.451 S21.451 Open bite of right back wall of thorax with penetration into thoracic cavity Non-Billable/Non-Specific Codes S21.451A..., initial encounterS21.451D..., subsequent encounterS21.451S..., sequela