I recently read that in the California exchange, failure of the insurer to provide an accurate list of plan providers might constitute a qualifying event that could allow you to change plans. If one of the carriers presented its entire provider list to you, you signed up for their policy, and then found out your doctor was on that list but not on the plan list, you could change policies. Since several insurers were guilty of that, lots of folks are eligible to change plans. However, I'm not sure how the federal exchange or the other state exchanges are handling the issue.