Health Maintenance Organization (HMO) plans: One of the most popular types of managed-care plans, this type of Medicare Advantage plan comes with a provider network that you must use to be covered by the plan (with the exception of medical emergencies). If you use non-network providers, you may have to pay the full cost for your care. You’re also required to have a primary care physician; if you need to see a specialist, you’ll need to a get a referral from your primary care doctor first.
Medicare Part D is optional prescription drug coverage. If you have Original Medicare, you can get this coverage through a Medicare Prescription Drug Plan, offered through private Medicare-approved insurance companies. These plans offer stand-alone prescription drug coverage that work alongside Original Medicare, Part A and Part B. A Medicare Advantage Prescription Drug plan also provides the Medicare Part D benefit, covering all Medicare benefits under a single plan.