Root Operations have similar English meanings but different PCS definitions

Examples of when add-on codes would be used include:

anesthesia for a patient more than 70 years old. biopsy of a second and third lesion. complicated closure of a second wound. all of the above.

Most pulmonary infarctions associated with thromboembolic obstruction occur in which part of the lung?

a. Right lung b. Lung bases c. Lung apexes d. Left lung