In new research published by the Mercatus Center, I analyze the causes and impact of the much higher-than-expected enrollment and spending associated with the Affordable Care Act (ACA) Medicaid expansion. Though unpredicted by Washington experts, the results were predictable. The federal government’s 100% financing of state spending on expansion enrollees has led states to boost enrollment and create high payment rates. (See this 2-minute Mercatus video for additional information on this significant development.)

In states that have expanded, enrollment and per enrollee spending are nearly 50% higher than predicted. While interest groups within the states—particularly hospitals and insurers—benefit from the higher spending being charged to federal taxpayers, substantial evidence suggests much of this new spending is wasted or provides little value for its intended recipients.

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