when did aca go into effect
September 23, 2010: President Obama signed the Patient Protection and Affordable Care Act (ACA) into law six months ago today, on March 23, 2010. On this anniversary, a number of insurance regulation reforms mandated by the ACA go into effect. Among the new rules are the following: 1  Dependent coverage eligibility for young adults is extended up to age 26. 2  Lifetime dollar limits on coverage are eliminated.