The healthcare landscape in the United States is facing significant upheaval as Aetna announces its departure from the Affordable Care Act (ACA) program. This decision comes at a time when the House budget reconciliation bill, known as the āOne Big Beautiful Bill Act,ā is making its way through Congress. If passed in the Senate, this legislation could result in large cuts to Medicaid spending, potentially leaving millions of newly uninsured individuals.
The budget reconciliation bill also includes provisions that could alter the ACA exchange landscape, leading to even more people losing their coverage. The Congressional Budget Office estimates that at least five million current marketplace enrollees could lose their coverage by 2034. The Kaiser Family Foundation projects that this number could reach up to eight million.
Changes in the ACA marketplace are expected to make coverage more expensive as enhanced tax credits expire. Additionally, open enrollment windows are set to shorten, paperwork burdens for beneficiaries will increase, and automatic re-enrollment will come to an end. Americans purchasing health coverage through the ACA exchanges may also face higher out-of-pocket maximums, resulting in higher cost-sharing.
Under President Biden, the ACA has seen a significant increase in reach. The Treasury Department announced that nearly 50 million people have obtained healthcare coverage through ACA marketplace exchanges since the law’s enactment. Between Biden’s inauguration in 2021 and September 2024, 18.2 million Americans gained ACA coverage for the first time, thanks to an expansion of premium tax credits.
Despite its early challenges and criticisms, the ACA has become more popular than ever, with over 60% of the public having a favorable view of the law. The ACA, also known as Obamacare, was signed into law in 2010 to increase health insurance coverage for the uninsured and implement reforms in the health insurance market and Medicaid expansion.
However, the ACA has faced threats of repeal by Republicans and underwent significant changes during the Trump administration. Enrollment fell, and the number of uninsured Americans rose. The Biden administration sought to reverse these trends by enlarging the ACA program and increasing the number of enrollees.
In addition to legislative changes, instability in the ACA exchanges is also being fueled by Aetna’s decision to withdraw from the marketplace in 2026. This move will leave about one million people across 17 states searching for new healthcare coverage. Aetna previously left the ACA marketplace in 2018, only to return in 2022. The uncertainty surrounding the ACA’s future could lead to more carriers exiting the market, further disrupting the healthcare landscape.
As the healthcare system in the U.S. continues to evolve, the future of the ACA remains uncertain. The decisions made in Congress and by insurance carriers will have a significant impact on millions of Americans who rely on the ACA for their health coverage.
