Research suggests that the expansion of Medicaid under the Affordable Care Act is reducing the number of uninsured patient visits to community health centers. Community health centers provide primary-care services to low-income populations. Under federal funding rules, they cannot deny services based on a person's ability to pay and are viewed as "safety net" clinics. Researchers from Oregon Health & Science University report there was a 40% drop in uninsured visits to clinics in states where Medicaid was expanded during the first half of 2014, when compared to the prior year. At the same time, Medicaid-covered visits to those clinics rose 36%.