The commercial health insurance markets in the United States in 2014 experienced a significant change relative to prior years. These changes were most dramatic in the individual health insurance market, with the conversion from medical underwriting to adjusted community rating in many states, as well as the implementation of the federal and state insurance marketplaces, facilitating premium assistance to many Americans who were previously uninsured. The 2014 edition of our annual report on the commercial health insurance market provides an overview of financial results in the individual and group insurance markets as well as focuses on enrollment changes in the individual market and the impact of the Patient Protection and Affordable Care Act of 2010’s (ACA) risk adjustment and risk corridor programs.