This article discusses the rule-making process within the Affordable Care Act and its impact on healthcare coverage and regulation in the United States. It explores the enactment process of the Act, the development of regulatory bodies, and the proposed rules and guidance documents generated for the clarification and redefinition of the rules. It also examines the challenges faced by organizations and the potential for judicial review in modifying the Act's provisions. Additionally, it discusses the market reforms and coverage expansions under the Act, both pre-2014 and beginning in 2014. The article concludes with a discussion on the implementation and oversight of the Affordable Care Act, including the role of the Health and Human Services Secretary, federal agencies, and congressional oversight.