The Kaiser Family Foundation has released an updated brief on the “coverage gap” in states that do not implement the Medicaid expansion under the ACA. Many adults within this gap earn too much to qualify for Medicaid but not enough to qualify for Marketplace premium tax credits. This KFF brief gives estimates of the number of people who fall into the coverage gap and discusses the state decisions not to implement the expansion, leaving many without an affordable coverage option. It also raises questions on what would happen if all states expanded their Medicaid programs. Nationally, more than two million poor uninsured adults fall into this gap that results from state decisions not to expand Medicaid and these people would gain Medicaid eligibility if all states expanded.