Posterior subluxation of right sternoclavicular joint, init

This code signifies a partial dislocation of the right sternoclavicular joint where the clavicle is displaced backward relative to the sternum. This injury involves stretching or tearing of the joint capsule and ligaments, but the joint surfaces remain in partial contact.

Apply this code for the initial treatment of a patient presenting with a right sternoclavicular joint injury confirmed as a posterior subluxation. This typically occurs following direct trauma to the anterior chest or indirect forces transmitted through the arm, such as a fall onto the shoulder.

• Ensure documentation specifies "posterior" and "subluxation" for the right sternoclavicular joint.
• The "A" seventh character indicates an initial encounter for active treatment of the injury.
• Distinguish from complete dislocation (S43.20-S43.29) and anterior subluxation (S43.21-).