In 2015, U.S. healthcare spending rose by 5.8% to $3.2 trillion, making up 17.8% of the GDP, driven mainly by increases in private health insurance and personal health expenditures. Key contributors to personal health expenditure growth included prescription drugs, hospital care, and physician services, which together accounted for 73% of total healthcare spending. The implementation of the Affordable Care Act (ACA) significantly reduced the uninsured rate and influenced spending patterns across various care categories.