A new report by the Geiger Gibson/RCHN Community Health Foundation Research Collaborative at the George Washington University School of Public Health and Health Services examines the impact of health reform on community health centers (CHCs) and their patients. The study estimates that more than five million health center patients would have gained coverage had all states participated in a sweeping Medicaid expansion. However, nearly half of all CHCs are located in states that have opted out of the expansion. As a result, more than a million uninsured CHC patients who would have been covered under a nationwide Medicaid expansion will be left without the protection of health insurance, according to the report.