Medicare offers prescription drug coverage to everyone with Medicare. Even if you don't take many prescriptions now, you should consider joining a Medicare drug plan. If you decide not to join a Medicare drug plan when you're first eligible, and you don't have other creditable prescription drug coverage, or you don't get Extra Help, you'll likely pay a late enrollment penalty if you join a plan later. Please refer to the 2019 Medicare & You guide for more details. To get Medicare prescription drug coverage, you must join a plan run by an insurance company or other private company approved by Medicare. Each plan can vary in cost and specific drugs covered.
There are 2 ways to get Medicare prescription drug coverage:
In either case, you must live in the service area of the Medicare drug plan you want to join.
Source: 2019 Medicare & You, The Official U.S. Government Medicare Handbook