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Medicaid represents $1 out of every $5 spent on health care in the U.S. and is the major source of financing for states to provide health coverage and long-term services and supports for low-income residents. This brief examines key questions about Medicaid financing and how it works.
This issue brief describes how Medicaid home care operates—including who is eligible and the systems in place to promote program integrity in its delivery—and the challenges of using new CMS data to identify unusual billing patterns or potential fraud in the program.
On February 14, 2026, CMS released a dataset with provider-level spending data that the agency suggests could be used to identify unusual billing patterns for specific services, states, or providers. This policy watch describes what the data include, what they exclude, and how they could potentially lead to mistaken conclusions given the limitations of the data.
On January 1, 2026, the Center for Medicare & Medicaid Innovation (CMMI) launched the Wasteful and Inappropriate Service Reduction (WISeR) Model that establishes new prior authorization requirements in traditional Medicare. This analysis explores the potential impact of the WISeR model by examining recent spending and utilization trends in traditional Medicare for services selected for prior authorization requirements in the six model states (Arizona, New Jersey, Ohio, Oklahoma, Texas, and Washington).
This brief evaluates what is currently known about fraud and abuse in the Affordable Care Act (ACA) Marketplace, including how the final Marketplace Integrity and Affordability Rule and the recently enacted budget reconciliation law change existing Marketplace enrollment and eligibility standards.
As Congress considers ways to help pay for extending tax cuts, some lawmakers have suggested that hundreds of billions of dollars in federal savings could be achieved by addressing fraud, waste and abuse in the Medicaid program. Three experts joined Health Wonk Shop series moderator Larry Levitt in an hour-long discussion designed to unpack claims about fraud and abuse and put them in a larger context.
This brief explains fraud, waste, abuse, and improper payments in Medicare and describes actions to ensure Medicare program integrity.
Program integrity efforts work to prevent and detect fraud, waste, and abuse, to increase program transparency and accountability, and to recover improperly used funds. This brief explains what is known about improper payments and fraud and abuse in Medicaid and describes ongoing state and federal actions to address program integrity.
Medicare Advantage plans denied 3.4 million prior authorization requests for health care services in whole or in part in 2022, or 7.4% of the 46.2 million requests submitted on behalf of enrollees that year, according to a new KFF analysis of federal data. That was a higher share of denials than in recent years.
Medicaid is a large source of spending in both state and federal budgets, making program integrity efforts important to prevent waste, fraud, and abuse and ensure appropriate use of taxpayer dollars. This brief explains what program integrity is, recent efforts at the Centers for Medicare and Medicaid Services (CMS) to address program integrity, and current and emerging issues.
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