ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.2 > S21.25 > S21.251 S21.251 Open bite of right back wall of thorax without penetration into thoracic cavity Non-Billable/Non-Specific Codes S21.251A..., initial encounterS21.251D..., subsequent encounterS21.251S..., sequela