Part A Late Enrollment Penalty If you are not eligible for premium-free Part A, and you don't buy a premium-based Part A when you're first eligible, your monthly premium may go up 10%. You must pay the higher premium for twice the number of years you could have had Part A, but didn't sign-up. For example, if you were eligible for Part A for 2 years but didn't sign-up, you must pay the higher premium for 4 years. Usually, you don't have to pay a penalty if you meet certain conditions that allow you to sign up for Part A during a Special Enrollment Period.
Public Part C Medicare Advantage health plan members typically usually also pay a monthly premium in addition to the Medicare Part B premium to cover items not covered by traditional Medicare (Parts A & B), such as the OOP limit, self-administered prescription drugs, dental care, vision care, annual physicals, coverage outside the United States, and even gym or health club memberships as well as—and probably most importantly—reduce the 20% co-pays and high deductibles associated with Original Medicare.[43] But in some situations the benefits are more limited (but they can never be more limited than Original Medicare and must always include an OOP limit) and there is no premium. In some cases, the sponsor even rebates part or all of the Part B premium, though these types of Part C plans are becoming rare.
Part B coverage includes out patient physician services, visiting nurse, and other services such as x-rays, laboratory and diagnostic tests, influenza and pneumonia vaccinations, blood transfusions, renal dialysis, outpatient hospital procedures, limited ambulance transportation, immunosuppressive drugs for organ transplant recipients, chemotherapy, hormonal treatments such as Lupron, and other outpatient medical treatments administered in a doctor's office. It also includes chiropractic care. Medication administration is covered under Part B if it is administered by the physician during an office visit.
You will pay one-half of the cost-sharing of some covered services until you reach the annual out-of-pocket limit of $5240 each calendar year. However, this limit does NOT include charges from your provider that exceed Medicare-approved amounts (these are called “Excess Charges”) and you will be responsible for paying this difference in the amount charged by your provider and the amount paid by Medicare for the item or service.
Additionally, the PPACA created the Independent Payment Advisory Board ("IPAB"), which is empowered to submit legislative proposals to reduce the cost of Medicare if the program's per-capita spending grows faster than per-capita GDP plus one percent.[87] While the IPAB would be barred from rationing care, raising revenue, changing benefits or eligibility, increasing cost sharing, or cutting payments to hospitals, its creation has been one of the more controversial aspects of health reform.[113] In 2016, the Medicare Trustees projected that the IPAB will have to convene in 2017 and make cuts effective in 2019.

All four Parts of Medicare—A, B and C, and D—are administered by private companies under contract to the Centers for Medicare and Medicaid Services (CMS). Almost all these companies are insurance companies, except for those that administer Medicare Advantage and other Part C plans. Most Medicare Advantage and other Part C plans are administered (CMS uses the term "sponsored") by integrated health delivery systems and non-profit charities under state laws, and/or under union or religious management.
The Omnibus Budget Reconciliation Act of 1989 made several changes to physician payments under Medicare. Firstly, it introduced the Medicare Fee Schedule, which took effect in 1992. Secondly, it limited the amount Medicare non-providers could balance bill Medicare beneficiaries. Thirdly, it introduced the Medicare Volume Performance Standards (MVPS) as a way to control costs.[53]
Several measures serve as indicators of the long-term financial status of Medicare. These include total Medicare spending as a share of gross domestic product (GDP), the solvency of the Medicare HI trust fund, Medicare per-capita spending growth relative to inflation and per-capita GDP growth; general fund revenue as a share of total Medicare spending; and actuarial estimates of unfunded liability over the 75-year timeframe and the infinite horizon (netting expected premium/tax revenue against expected costs). The major issue in all these indicators is comparing any future projections against current law vs. what the actuaries expect to happen. For example, current law specifies that Part A payments to hospitals and skilled nursing facilities will be cut substantially after 2028 and that doctors will get no raises after 2025. The actuaries expect that the law will change to keep these events from happening.

The Omnibus Budget Reconciliation Act of 1989 made several changes to physician payments under Medicare. Firstly, it introduced the Medicare Fee Schedule, which took effect in 1992. Secondly, it limited the amount Medicare non-providers could balance bill Medicare beneficiaries. Thirdly, it introduced the Medicare Volume Performance Standards (MVPS) as a way to control costs.[53]
More limited income-relation of premiums only raises limited revenue. Currently, only 5 percent of Medicare enrollees pay an income-related premium, and most only pay 35 percent of their total premium, compared to the 25 percent most people pay. Only a negligible number of enrollees fall into the higher income brackets required to bear a more substantial share of their costs—roughly half a percent of individuals and less than three percent of married couples currently pay more than 35 percent of their total Part B costs.[152]
Most Medicare enrollees do not pay a monthly Part A premium, because they (or a spouse) have had 40 or more 3-month quarters in which they paid Federal Insurance Contributions Act taxes. The benefit is the same no matter how much or how little the beneficiary paid as long as the minimum number of quarters is reached. Medicare-eligible persons who do not have 40 or more quarters of Medicare-covered employment may buy into Part A for an annual adjusted monthly premium of:
Without question, Original Medicare with a Medigap plan gives you very comprehensive coverage. The primary differences are that with Medigap plans, you can see any doctor that accepts Medicare. You don’t have to ask your doctors if they take your specific Medigap insurance company. The network is Medicare, which has over 800,000 providers. The network is nationwide, not local.
But that has not been the case at all. Medicare Advantage enrollment continues to grow each year. There were 19 million Advantage enrollees in 2017, which is about a third of all Medicare beneficiaries, who totaled about 58 million in 2017). The number of Medicare Advantage plans available has been fairly steady since 2011 (2,034 in 2016, up from 1,945 in 2015; but down from a high of 2,830 in 2009). The majority of beneficiaries still have at least one zero-premium plan available to them, and the average enrollee could select from among 21 plans in 2018, which was slightly higher than it had been at any point since 2011 (but this is still down significantly from 48 plans in 2009).
Most people fill Medicare’s coverage gaps by buying a Medicare supplement (medigap) plan and a Part D prescription-drug plan, or they get both medical and drug coverage from a private insurer with a Medicare Advantage plan. You have from October 15 to December 7 each year to pick a Medicare Part D prescription-drug plan or a Medicare Advantage plan for the year ahead. You can switch from one Part D plan to another, or from one Medicare Advantage plan to another. You can also switch into a Medicare Advantage plan. However, if you have Medicare Advantage and want to switch to a medigap plan plus a Part D plan, you may have limited medigap options depending on your health—although you can choose any Part D plan during open enrollment. (For more information about how to choose between Medicare Advantage or medigap and Part D, see How to Fill Medicare Coverage Gaps).
Medicare Part B (Medical Insurance) - Part B helps cover doctors' services and outpatient care. It also covers some other medical services that Part A doesn't cover, such as some of the services of physical and occupational therapists, and some home health care. Part B helps pay for these covered services and supplies when they are medically necessary. Most people pay a monthly premium for Part B.