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 of back wall of thorax
 * S20.451 Superficial foreign body of right back wall of thorax
 * S20.452 Superficial foreign body of left back wall of thorax
 * S20.459 Superficial foreign body of unspecified back wall of thorax
 * S20.46 Insect bite (nonvenomous) of back wall of thorax
 * S20.461 Insect bite (nonvenomous) of right back wall of thorax
 * S20.462 Insect bite (nonvenomous) of left back wall of thorax
 * S20.469 Insect bite (nonvenomous) of unspecified back wall of thorax
 * S20.47 Other superficial bite of back wall of thorax
 * Excludes1: open bite of back wall of thorax (S21.24)
 * S20.471 Other superficial bite of right back wall of thorax
 * S20.472 Other superficial bite of left back wall of thorax
 * S20.479 Other superficial bite of unspecified back wall of thorax
 * S20.9 Superficial injury of unspecified parts of thorax
 * Excludes1: contusion of thorax NOS (S20.20)
 * S20.90 Unspecified superficial injury of unspecified parts of thorax
 * Superficial injury of thoracic wall NOS
 * S20.91 Abrasion of unspecified parts of thorax
 * S20.92 Blister (nonthermal) of unspecified parts of thorax
 * S20.94 External constriction of unspecified parts of thorax
 * S20.95 Superficial foreign body of unspecified parts of thorax
 * Splinter in thorax NOS
 * S20.96 Insect bite (nonvenomous) of unspecified parts of thorax
 * S20.97 Other superficial bite of unspecified parts of thorax
 * Excludes1: open bite of thorax NOS (S21.95)

S21 Open wound of thorax

 * Code also any associated injury (to) (such as) :
 * heart (S26.-)
 * intrathoracic organs (S27.-)
 * rib fracture (S22.3-, S22.4-)
 * spinal cord injury (S24.0-, S24.1-)
 * traumatic hemothorax (S27.1)
 * traumatic hemopneumothorax (S27.3)
 * traumatic pneumothorax (S27.0)
 * wound