Medicare spending is projected to double over the next decade due to rising healthcare costs and increased enrollment, according to a new analysis from the nonpartisan Congressional Budget Office. 

The CBO estimated in its annual Budget and Economic Outlook that the federal healthcare program for seniors will cost $1.1 trillion in 2026 as more baby boomers reach age 65. But by 2036, CBO estimates, Medicare coverage will cost the federal government $2 trillion, or more than 4% of projected gross domestic product.