This article examines the past, present, and future of individual market policies in the Affordable Care Act (ACA). It does so, first, by reviewing the law's goals, scope, and set of individual market policies, collectively called the Health Insurance Marketplace. The Marketplace, along with the ACA's Medicaid expansion, was designed to fill in gaps to provide all Americans with accessible, affordable coverage. Second, it reviews evidence on the law's impact to date, including changes under a new administration. Third, it discusses the three main policy options for the Marketplace: do nothing, build on it, or replace it. Lastly, it discusses the factors which could determine which pathway policy makers follow.

Health reform proposals tend to be rich with details and dimensions. The primary goal of health reform is typically to extend health coverage to people who lack it. Yet even the most similar of plans differ in terms of exactly who is targeted for assistance, the means by which assistance is delivered, and the type of health coverage promoted. Moreover, the Byzantine nature of the existing U.S. health system means that any reform plan can appear complex. The plan that aims for a new, simple health system will require radical changes to achieve it, while the plan that strives to be the least disruptive will have extensive rules that target assistance while maintaining the existing sources of coverage. Indeed, some have argued that the complexity inherent in meaningful reform is an impediment to reform itself.