So I was surprised — and encouraged — that the president is pushing significant reductions in the program's spending.

True, his previous budgets have had Medicare cuts. But the 2020 plan calls for much larger reductions. And they take place against the backdrop of a coming presidential election in which several Democrats are running on a platform of significantly expanding Medicare. The contrast to the president's 2016 posture is striking.

The cuts aren't as large as they first seem because the proposed spending plan moves two current Medicare components — payments for graduate medical education and uncompensated care — into other parts of the budget, while also capping their growth.

Actual Medicare reductions are between $515 billion and $575 billion over 10 years, according to the Committee for a Responsible Federal Budget, a nonpartisan research organization devoted to fiscal responsibility. This would slow Medicare's growth to between 90 percent and 95 percent over the next decade, according to the group's analysis. Under current law, spending on the program is projected to grow by 111 percent over that period.

Some of the proposed reforms would be welcome because they reduce costs by changing the underlying structure and incentives of Medicare components.

For example, one proposal would set a common payment for certain types of rehabilitative or palliative care following (or at times in place of) treatment received for an acute medical need at a hospital. Currently, payments for these services depend on whether they were performed in a hospital or at an outpatient facility, with hospitals typically getting higher payments. The budget proposes to eliminate this distinction, and pay based on the treatment received by the patient.

Another reform would stop the practice of giving some physicians higher payments for the same service because a hospital owns their office. Instead, these doctors, working in offices owned by but not located in a hospital, would be paid the normal Medicare rate. Similarly, the budget proposes to pay the same rate for certain services provided at a hospital outpatient department as at physicians' offices.

These are not properly understood as benefit cuts (though they will be portrayed that way by the president's opponents). Instead, they are designed to make the program more efficient to the taxpayer and to the beneficiaries by removing incentives for hospitals to buy physician practices (which can reduce competition in health-care markets) and for care to take place in relatively more expensive hospital settings.

The Trump budget does propose outright cuts: Much of its Medicare spending reductions would come from reduced payments to health-care providers.

Given the enormous projected growth in Medicare over the coming decade and decades, cutting payments to providers is reasonable. But the structural reforms aimed at improving efficiency and incentives are the most laudable. We need more of those types of changes.

A great place to build off the proposals in the budget would be reducing (ideally, eliminating) the subsidy given to current workers who have employment-based health insurance. Premiums for these plans are excluded from income and payroll taxes, which will result in $3.7 trillion in lost revenue over the next 10 years. If the premiums were taxed, the revenue could be used to finance other things, including structural reforms in Medicare.

While not part of the Medicare program, the exclusion of these premiums from taxation encourages people to purchase relatively more generous coverage, pushing up the overall growth of health prices and spending.

There is no shortage of other ideas to change Medicare's structure for the better. Premiums could be made higher for better-off seniors. Health-care scholars at the American Enterprise Institute, where I work, and the Brookings Institution recently published a number of suggestions that should be considered.

These include increasing incentives for providers to prescribe lower-cost, generic drugs, expanding the use of “bundled” payments, in which a fixed payment is made for all care associated with a health episode, and placing additional restrictions on private insurance plans that supplement Medicare.

In the meantime, the president's 2020 budget is a step in the right direction, particularly in light of Trump's 2016 campaign rhetoric. Three cheers for slowing the growth of Medicare, and one and a half cheers for the way his plan goes about doing so. Brace yourself for the 2020 Medicare wars.

Read more: 

• Medicare for All: Where the 2020 presidential candidates stand
• Medicaid expansion cheaper than ACA subsidies
• Medicare buy-in would cut billions in hospital revenues

This column does not necessarily reflect the opinion of the editorial board or Bloomberg LP and its owners.

Michael R. Strain ([email protected]) is a Bloomberg Opinion columnist. He is director of economic policy studies and resident scholar at the American Enterprise Institute. He is the editor of “The U.S. Labor Market: Questions and Challenges for Public Policy.”  To contact the editor responsible for this story: Katy Roberts at [email protected].