An agent or broker can help you with the process of selecting a plan and completing the enrollment. In order to best assist you, they will need to know the names and dosages of any medications you take, as well as your preferred pharmacies, so that they can narrow down the options based on how your medications will be covered. (Out-of-pocket costs for specific medications will vary considerably from one plan to another and from one pharmacy to another).
And if you’re considering Medicare Advantage plans, the agent will also need to know the names of your doctors, in order to find plans that have those doctors in their provider networks.