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Unlike Original Medicare, which is administered through Medicare (Social Security Administration), Medicare Advantage plans are obtained through major private insurance companies. These plans roll Medicare Parts A, B, and D into one policy which you purchase for a certain amount per month. These are managed care plans of some sort, so you can only see permitted providers. Some of these plans are perferred-provider only (PPO), so the choice is wider, but the cost is more expensive. These plans may have a few more and sometimes less services than Original Medicare. You will need to check the policies and compare them carefully with original Medicare. These Advantage Plans also have deductibles and co-payments for most services, including major yearly deductibles for hospitalizations. Therefore, although the monthly premium may be less than a combined Part B, a Medex policy and the premium for Part D under original Medicare, you may end up paying more after the one premium, co-payments and deductibles. These plans may also include Part D, depending on which plan you buy. The lower the premium the less coverage and vice-versa.
Medicare Advantage Plans make money by contracting with Social Security to pay for a portion your coverage, plus your monthly premium, plus deductibles and co-payments. You should compare costs, benefits, and access to physicians carefully before choosing one of the two Medicare approaches. Many insurance companies provide a variety of plans; again for a lower premium you receive less coverage and vice-versa.