News-Medical.net explains how the expiration of federal funding to community health centers after September, 2015, will create a funding cliff for primary care clinics located in medically underserved areas.  The article discusses research conducted by the Geiger Gibson/RCHN Community Health Foundation Research Collaborative at Milken Institute School of Public Health (Milken Institute SPH) at the George Washington University. The study analyzes the impact of government funding decisions on community health center capacity in the coming years and finds that without federal funding and expanded Medicaid, the number of patients served by community health centers will drop from 25.6 million in 2014 to18.8 million by 2020.