@brian93 Here are some questions I would ask myself after that seemingly "casual" response:
Am I comfortable with this doc and their general approach to my lung health? Are they experienced in treating MAC and bronchiectasis (or COPD)?
Was I for the MAC infection? What was the outcome?
Did the doctor initiate any airway clearance or other therapy to help keep my lungs clear?
Am I having sputum cultures in addition to periodic CT scans?

I think you see where this is headed, do you have the best doctor to help you manage this chronic condition proactively?
Sue