Research reveals Medicaid expansion is still improving hospital finances

A new study published in

Medical Care Research and Review

found that the Affordable Care Act, which expanded Medicaid programs to cover people previously uninsured, provided a financial boost to hospitals.

The study conducted by faculty at the Colorado School of Public Health on the University of Colorado Anschutz Medical Campus is the first to investigate the effects of Medicaid expansion by comparing estimates using data from both the Internal Revenue Service (IRS) and the Centers for Medicare and Medicaid Services (CMS).

“The IRS and CMS data sources serve as primary resources for assessing the impact of Medicaid expansion on hospitals’ financial status. The comparison of the two is timely and can inform the decisions of health practitioners, policymakers and regulators at a state and national level,” said lead author Tatiane Santos, MPH, PhD, faculty at the Colorado School of Public Health and fellow at the Wharton School and Leonard Davis Institute of Health Economics at the University of Pennsylvania.

Santos adds, “This is especially relevant in the context of the recently passed American Rescue Plan Act of 2021, which provides additional incentives for the 12 states that have not yet expanded Medicaid.”

The researchers examined the state-level impact of Medicaid expansion on hospital finances and based on the IRS data found that uncompensated care costs declined by 28 percent in states that expanded Medicaid relative to uncompensated care costs in 2013, the year before Medicaid expansion (9.3 percent of operating expenses in 2013). The findings based on the CMS data showed that there was a 32 percent decline in uncompensated care costs relative to costs in 2013 (5.0 percent of operating expenses in 2013).

These results are in line with previous studies that have reported that expansion has resulted in substantial reductions in hospitals’ uncompensated care costs and increases in their Medicaid shortfalls (these shortfalls are the difference between Medicaid reimbursement and what it costs providers to care for patients).

Nationally, the estimated net effect of expansion reduced not-for-profit hospital costs by two percentage points based on IRS data and 0.83 percentage points based on CMS data. Across expansion states, the estimated net effects varied widely with approximately a 10-fold difference for hospitals based on IRS data and a two-fold difference based on CMS data.

Another key finding revealed that the increase in hospital’s Medicaid shortfalls has been occurring more gradually, a result that may be partially attributable to a growing Medicaid population in expansion states.

The authors mention that while Medicaid expansion has clearly had an impact on hospitals’ financial status, assessment of the actual magnitude of the effects is sensitive to the data sources used.

“Expansion effects have also varied by state, which may be an indicator of how states may potentially weather the COVID-19 pandemic financial shocks, including unemployment and increasing Medicaid enrollment. These are important findings for future consideration as Medicaid expansion continues to be a source of debate across the United States as a health policy initiative,” added Santos.

The authors suggest that future studies should further explore the differences across IRS and CMS data. They suggest that as the pandemic unfolds Medicaid will be especially critical in serving the most vulnerable populations. States will need to make difficult financial decisions to protect their safety net hospitals and hospitals at highest risk of financial distress.

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About the University of Colorado Anschutz Medical Campus

The University of Colorado Anschutz Medical Campus is a world-class medical destination at the forefront of transformative science, medicine, education, and patient care. The campus encompasses the University of Colorado health professional schools, more than 60 centers and institutes, and two nationally ranked independent hospitals that treat more than two million adult and pediatric patients each year. Innovative, interconnected and highly collaborative, together we deliver life-changing treatments, patient care, professional training, and conduct world-renowned research. For more information, visit

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