By far, the most popular provisions of the Affordable Care Act is that it mandates Guaranteed Issue (GI) and Community Rating (CR) rules to all major medical healthcare insurance policies in most of the United States (all 50 states, plus DC...most ACA provisions don't apply in Puerto Rico, Guam and other U.S. Territories). These provisions state, quite simply, that insurance carriers can no longer discriminate against enrollees based on their physical or mental health status or history, their gender and so on, and can therefore no longer use medical underwriting to either cherry-pick who their enrollees are or how much they're charged in premiums for a given policy.
