ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.1 > S21.10 S21.10 Unspecified open wound of front wall of thorax without penetration into thoracic cavity Non-Billable/Non-Specific Codes S21.101Unspecified open wound of right front wall of thorax without penetration into thoracic cavityS21.101A..., initial encounterS21.101D..., subsequent encounterS21.101S..., sequelaS21.102Unspecified open wound of left front wall of thorax without penetration into thoracic cavityS21.102A..., initial encounterS21.102D..., subsequent encounterS21.102S..., sequelaS21.109Unspecified open wound of unspecified front wall of thorax without penetration into thoracic cavityS21.109A..., initial encounterS21.109D..., subsequent encounterS21.109S..., sequela