the respiratory system is separated into a conducting zone and respiratory zone. The conducting zone consists of the nose, pharynx, larynx, trachea, bronchi, and bronchioles. These structures form a continuous passageway for air to move in and out of the lungs. The respiratory zone is found deep inside the lungs and is made up of the respiratory bronchioles, alveolar ducts, and alveoli. These thin-walled structures allow inhaled oxygen to diffuse into the lung capillaries in exchange for carbon dioxide. the same structures are often divided into the upper and lower respiratory tracts. The upper respiratory tract structures are found in the head and neck and consist of the nose, pharynx, and larynx. The lower respiratory tract structures are located in the thorax or chest and include the trachea, bronchi, and lungs (bronchioles, alveolar ducts, and alveoli). The upper respiratory tract structures are found in the head and neck and consist of the nose, pharynx, and larynx. Many authorities include the larynx with the lower respiratory tract structures
In contrast with knee arthroscopies, compartments do not matter for wrist arthroscopies. For example, 29846 Arthroscopy, wrist, surgical; excision and/or repair of triangular fibrocartilage and/or joint debridement includes a synovectomy (29845 Arthroscopy, wrist, surgical; synovectomy, complete), regardless of whether the synovectomy was performed in a separate compartment (CPT® Assistant, December 2003).
Shoulder arthroscopy codes encompass two joints in the shoulder area: the glenohumeral joint (typically called the shoulder joint) and the acromioclavicular joint. The acromioclavicular joint is the smaller of the two and there are arthroscopy codes specific to it; excision of the distal clavicle, 29824 Arthroscopy, shoulder, surgical; distal claviculectomy including distal articular surface (Mumford procedure) and decompression of the subacromial space, 29826 Arthroscopy, shoulder, surgical; decompression of subacromial space with partial acromioplasty, with or without coracoacromial release, which includes partial excision of the acromion or acromioplasty.
Arthroscopic debridement of the labrum and of the undersurface of the rotator cuff (29822 Arthroscopy, shoulder, surgical; debridement, limited) may be reported separately when performed with subacromial decompression (29826), according to the May 2001 CPT®