The creation of Health Insurance Exchanges (HIEs) is among the most important changes to the health care system made by the Affordable Care Act (ACA).  The HIEs are marketplaces where consumers and small businesses can shop for private health insurance plans. Many anesthesia and pain medicine patients will be covered by health plans participating in HIEs beginning as soon as October 2013.  Payment rates under such plans have the potential to make or break providers.  Additionally, some group practices may choose to offer coverage through the HIEs.  A basic familiarity with HIE structure and operations is therefore in order. Who The ACA provides that effective January 1, 2014, there shall be at least one HIE in each of the fifty states.  States have the option of (1) setting up their own HIEs, (2) partnering with the federal government to run an exchange, or (3) opting out—in which case, the Department of...