Did you know that Medicare.gov is not always accurate? Many of my clients try to look for drug and Medicare Advantage plans on their own during Annual Enrollment. Doing so early in Annual Enrollment may cause you to choose the wrong plan.
From personal experience, I can show that you can run the same drug list twice in the same day and get different results. So, be extremely cautious and don't rely on those results.
The most reliable source is with the insurance companies. Licensed and trained Medicare agents can check with the carriers to ensure all of your drugs and doctors are covered. This is the most reliable way to ensure you make the right choice each year.