ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.1 > S21.15 S21.15 Open bite of front wall of thorax without penetration into thoracic cavity Non-Billable/Non-Specific Applicable To Bite of front wall of thorax NOS Type 1 Excludes superficial bite of front wall of thorax (S20.37) Codes S21.151Open bite of right front wall of thorax without penetration into thoracic cavityS21.151A..., initial encounterS21.151D..., subsequent encounterS21.151S..., sequelaS21.152Open bite of left front wall of thorax without penetration into thoracic cavityS21.152A..., initial encounterS21.152D..., subsequent encounterS21.152S..., sequelaS21.159Open bite of unspecified front wall of thorax without penetration into thoracic cavityS21.159A..., initial encounterS21.159D..., subsequent encounterS21.159S..., sequela