S20.41 - Abrasion of back wall of thorax S20.4 - Other and unspecified superficial injuries of back wall of thorax S20.41 - Abrasion of back wall of thorax S20.411 - Abrasion of right back wall of thorax S20.412 - Abrasion of left back wall of thorax S20.419 - Abrasion of unspecified back wall of thorax