Americans who gain health insurance coverage through the Affordable Care Act will increase the demand for health care services, but only slightly. According to a Commonwealth Fund brief, the number of annual primary care visits will rise by 3.8 percent nationally. New York University researchers Sherry Glied and Stephanie Ma say the health system should be able to accommodate the increased demand, since access to care is most influenced by local patterns of health service use and whether medical practices use physician assistants or health information technology.