For years, one of Medicare’s most significant advantages has been freedom — the ability for beneficiaries to choose their own doctors and see specialists without jumping through hoops. That flexibility may soon look different. The Centers for Medicare and Medicaid Services (CMS) is steering traditional Medicare toward new cost-control models that could alter how care is accessed and approved.
By 2030, CMS plans for every Medicare beneficiary to be part of an accountable care arrangement, a shift designed to tighten budgets but also likely to impact patient experience.
A New Model for Traditional Medicare
The CMS Innovation Center recently outlined a strategic goal: transition all Medicare and Medicaid enrollees to accountable care organizations (ACOs). These groups — made up of doctors, hospitals, and other providers — coordinate care and share financial risk. When spending stays below a set target, ACOs receive bonuses. If costs exceed expectations, they face penalties.
This system mirrors elements of Medicare Advantage, where cost control often leads to stricter rules around treatment approval. According to CMS, this initiative aims to make traditional Medicare more financially sustainable without sacrificing care quality — but some experts warn it may lead to fewer choices and longer wait times.
“Accountable care organizations are structured to operate more like Medicare Advantage plans — they are rewarded for not providing care,” said Mary Johnson, an independent Social Security and Medicare analyst. “There will be more denials of care, more delays of care.”
What Beneficiaries Might Notice
Freepik | The ACO change patients might notice is shorter appointments, possibly cutting them from 30 minutes to 15.
While many patients won’t realize they’re part of an ACO, the changes could be noticeable. Johnson explained that the shift could mean:
1. Shorter appointments — possibly 15 minutes instead of 30.
2. Replacing follow-up nurse calls with automated messages.
3. More paperwork and prior authorizations for treatments or procedures.
These operational tweaks, while designed to streamline costs, could feel like barriers to patients used to traditional Medicare’s simplicity.
Why CMS Is Pushing for Change
The motivation behind this major overhaul is clear — rising costs. Medicare’s total enrollment, currently about 67.3 million, is projected to reach 77 million by 2030 as baby boomers continue to age. Of those enrolled, 33.5 million people still rely on traditional Medicare.
As of early 2025, 53.4% of them — roughly 14.8 million people — were already connected to an accountable care provider. That’s a 4.3 percentage point increase from the previous year, marking the largest annual growth since CMS began tracking ACO participation.
According to the Medicare Payment Advisory Commission (MedPAC), spending on the program doubled between 2008 and 2022 and could double again by 2032, hitting $1.9 trillion. Medicare’s share of the U.S. gross domestic product is expected to rise from 3.1% in 2021 to 3.9% by 2030.
“Medicare and Medicaid are not something that can go on spending money forever,” said Michael Cannon, director of health-policy studies at the Cato Institute. “Eventually, they’re going to have to cut Medicare.”
Balancing Cost and Care
YouTube | Brookings Institution | Matthew Fiedler endorsed the Medicare plan, calling it a good move to cut costs without harming care.
Experts remain divided on whether ACOs can deliver quality care while saving money. Matthew Fiedler, a senior fellow at the Brookings Institution, called the direction “a good move for the Medicare program,” suggesting it could “modestly reduce spending without hurting care.”
Others remain skeptical. Robert Moffit of the Heritage Foundation, who served as a health policy official under the Reagan administration, said the model is designed to make Medicare act more like Medicare Advantage — coordinating care and reducing unnecessary treatments. Still, he acknowledged the enormous fiscal challenge ahead.
“We’re seeing a dramatic increase in patients as baby boomers age,” Moffit said. “You can’t separate any discussion of the country’s financial health without talking about entitlement spending.”
The Bigger Picture
As enrollment and costs rise, CMS is actively reshaping how healthcare dollars are spent. ACOs aim to reduce redundant testing and improve coordination among providers. However, they could also limit the autonomy patients currently enjoy when choosing their care.
Michael Cannon warned that the government has repeatedly promised a more efficient Medicare system. “Year after year, president after president promises this time, by God, we’ll make Medicare work efficiently — and taxpayers stand there holding the tax burden,” he said.
Whether accountable care models succeed depends on how well they balance cost savings with patient satisfaction. As CMS pushes for full participation by 2030, traditional Medicare — once valued for its flexibility — may start to resemble managed care systems in how it approves treatments and coordinates care.