ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.3 > S21.30 S21.30 Unspecified open wound of front wall of thorax with penetration into thoracic cavity Non-Billable/Non-Specific Codes S21.301Unspecified open wound of right front wall of thorax with penetration into thoracic cavityS21.301A..., initial encounterS21.301D..., subsequent encounterS21.301S..., sequelaS21.302Unspecified open wound of left front wall of thorax with penetration into thoracic cavityS21.302A..., initial encounterS21.302D..., subsequent encounterS21.302S..., sequelaS21.309Unspecified open wound of unspecified front wall of thorax with penetration into thoracic cavityS21.309A..., initial encounterS21.309D..., subsequent encounterS21.309S..., sequela