Final answer:
A pulmonary function test is the procedure that is not coded using a code from the respiratory system codes, as it is a non-invasive test measuring lung function without directly intervening on respiratory structures.
Step-by-step explanation:
The procedure that would not be coded using a code from the respiratory system codes is a pulmonary function test. A pulmonary function test measures the function of lung capacity and lung and chest wall mechanics to determine whether or not the patient has a respiratory problem, not directly engaging in any alteration or invasive procedure on the respiratory structures themselves.
Procedures such as bronchoscopy, nasal polyp removal, and tracheostomy are directly associated with the respiratory system and are coded accordingly because they involve inspection, removal, or modification of respiratory system structures. In contrast, a pulmonary function test is a non-invasive test that evaluates respiratory function but does not involve any direct procedural intervention on the respiratory organs.