Medicare Advantage

Check with your local Social Security office to make sure of your position and consider the alternatives; Original Medicare (A and B) are mandatory but you can choose the plan type that suits your needs.
You can add the Medicare advantage plan (C) and if you anticipate the regular use of prescription drugs most Medicare advantage plans provide you this but if they do not, you should consider plan (D).
Check your recent history of medical service usage. Can you reflect this in you Medicare planning?
Contact a private health insurance marketplace such as TrueCoverage for expert and unbiased advice and a free quotation based on your personal circumstances.

Medicare Part A (Hospital insurance) is funded by payroll taxes and services are generally available without paying a monthly premium. (you must of course be registered)

Medicare Parts B, C, and D are paid through a monthly premium determined by your choice of plan, i.e. your agreed deductibles, co-pays and co-insurances.