When did open enrollment in the health insurance marketplace begin under the ACA?

Open enrollment in the health insurance marketplace under the Affordable Care Act began on October 1, 2013. This date marked the launch of the Health Insurance Marketplace, where individuals and families could shop for and enroll in health insurance plans that were compliant with ACA standards. The marketplace was established to assist people in finding affordable coverage and to expand access to health insurance for those who previously lacked it. Starting from this date, consumers were able to sign up for coverage that would take effect on January 1, 2014. This milestone was significant as it introduced numerous reforms aimed at increasing insurance coverage and improving healthcare access throughout the United States.