More than 190,000 Georgians are enrolled in the health insurance exchange created by the Affordable Care Act. But if a Washington, D.C., federal court ruling announced Tuesday on exchange subsidies is ultimately upheld, that Georgia number could shrink precipitously. The U.S. Court of Appeals for the District of Columbia ruled Tuesday that the language of the health-care law, also known as "Obamacare," allows subsidies, or discounts, only for people who obtain coverage through exchanges run by the states, and not by the federal government.