Open Enrollment for Obamacare Has Begun. Here’s What to Know

Open enrollment for health insurance under the Affordable Care Act, a.k.a. Obamacare, begins Nov. 1. Whether you’re one of the roughly 10 million Americans already enrolled, or you're thinking about enrolling now for the first time, here are three things you need to know: The Sign-Up Window Is 6 Weeks Shorter This Year The Obamacare open enrollment period for 2018 coverage runs from Nov. 1 through Dec. 15 for the 39 states that use healthcare.