Lac w/o fb of l bk wl of thorax w/o penet thor cavity, init

This code describes a superficial cut or tear to the skin and underlying soft tissues on the left side of the back of the chest. Importantly, there is no foreign object embedded in the wound, and the injury does not extend into the chest cavity itself. This indicates a localized, non-penetrating trauma to the posterior thoracic wall.

This code is appropriate for documenting an initial encounter for a patient presenting with a laceration on the left posterior thorax that has been clinically determined not to involve foreign bodies or penetrate the pleural space. This would include injuries from falls, blunt trauma, or sharp objects that only affect the superficial layers.

• Always confirm the laterality (left) and the absence of foreign body and thoracic cavity penetration.
• Ensure this is the initial encounter for the injury; subsequent care would use a different seventh character.
• Distinguish from an open wound with foreign body (S21.22-) or a penetrating wound (S21.23-).