ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.3 > S21.35 S21.35 Open bite of front wall of thorax with penetration into thoracic cavity Non-Billable/Non-Specific Type 1 Excludes superficial bite of front wall of thorax (S20.37) Codes S21.351Open bite of right front wall of thorax with penetration into thoracic cavityS21.351A..., initial encounterS21.351D..., subsequent encounterS21.351S..., sequelaS21.352Open bite of left front wall of thorax with penetration into thoracic cavityS21.352A..., initial encounterS21.352D..., subsequent encounterS21.352S..., sequelaS21.359Open bite of unspecified front wall of thorax with penetration into thoracic cavityS21.359A..., initial encounterS21.359D..., subsequent encounterS21.359S..., sequela