ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.3 > S21.35 > S21.359 S21.359 Open bite of unspecified front wall of thorax with penetration into thoracic cavity Non-Billable/Non-Specific Codes S21.359A..., initial encounterS21.359D..., subsequent encounterS21.359S..., sequela