Keep in mind that Medigap plans don’t include prescription drug coverage (Part D), so if you want help with your medication costs, you’ll need to enroll in a stand-alone Medicare Prescription Drug Plan. In addition, you can’t use your Medicare Supplement plan to pay for costs you may have with a Medicare Advantage plan. Medigap insurance can only be used to cover costs in Original Medicare.
The standardized Medigap plans each cover certain Medicare out-of-pocket costs to at least some degree. Every Medigap plan covers up to one year of Medicare Part A coinsurance and hospital costs after Medicare benefits are used up. But, for example, Medigap Plan G plans don’t cover your Medicare Part B deductible, while Medigap Plan C plans do. So, if you’d like to enroll in a Medicare Supplement insurance plan, you might want to compare the Medigap policies carefully.
The PPACA instituted a number of measures to control Medicare fraud and abuse, such as longer oversight periods, provider screenings, stronger standards for certain providers, the creation of databases to share data between federal and state agencies, and stiffer penalties for violators. The law also created mechanisms, such as the Center for Medicare and Medicaid Innovation to fund experiments to identify new payment and delivery models that could conceivably be expanded to reduce the cost of health care while improving quality.[118]
Medicare contracts with regional insurance companies to process over one billion fee-for-service claims per year. In 2008, Medicare accounted for 13% ($386 billion) of the federal budget. In 2016 it is projected to account for close to 15% ($683 billion) of the total expenditures. For the decade 2010–2019 Medicare is projected to cost 6.4 trillion dollars.[54]
More than likely you are going to end up with an HMO type of plan, even if you opt for a Medicare Part C plan that requires you to pay a premium. HMO’s are different from PPO’s, so you’ll need to pay attention. HMO’s require you to stay within network from almost all of you Medical needs.  You’ll also need to get a referral from you Primary Care doctor when seeing a specialist most of the time.  Therefore, you’re going to want to choose a well-known company that has an excellent Medicare Advantage plan network for you to choose from.
The 2003 payment formulas succeeded in increasing the percentage of rural and inner city poor that could take advantage of the OOP limit and lower co-pays and deductibles—as well as the coordinated medical care—associated with Part C plans. In practice however, one set of Medicare beneficiaries received more benefits than others. The MedPAC Congressional advisory group found in one year the comparative difference for "like beneficiaries" was as high as 14% and have tended to average about 2% higher.[47] The word "like" in the previous sentence is key. MedPAC does not include all beneficiaries in its comparisons and MedPAC will not define what it means by "like" but it apparently includes people who are only on Part A, which severely skews its percentage comparisons—see January 2017 MedPAC meeting presentations. The differences caused by the 2003-law payment formulas were almost completely eliminated by PPACA and have been almost totally phased out according to the 2018 MedPAC annual report, March 2018. One remaining special-payment-formula program—designed primarily for unions wishing to sponsor a Part C plan—is being phased out beginning in 2017. In 2013 and since, on average a Part C beneficiary cost the Medicare Trust Funds 2%-5% less than a beneficiary on traditional fee for service Medicare, completely reversing the situation in 2006-2009 right after implementation of the 2003 law and restoring the capitated fee vs fee for service funding balance to its original intended parity level.