What do enrollees typically pay for a Medicare Part C plan?
Medicare Part C: Page 6
Some Medicare Part C plans charge no premium. However, you still have to pay Medicare Part B's monthly premium; Medicare uses these funds to provide financial support to the Medicare Part C plans. Other Medicare Part C plans charge their own added monthly premium. This added premium, though, is usually substantially less than what you'd pay for a Medigap supplemental insurance policy.
With a Medicare Part C plan, you don't have to pay Medicare Part A and Part B deductibles and co-payments. But the Medicare Part C plans have their own deductibles and co-pays. So, when considering a plan, be sure to investigate these payments as well as the monthly premiums.