It’s that time of year again. Open enrollment is when you can sign up for health insurance, make changes to your plan, or cancel your plan—whether that plan is through your job, Medicare, or the Affordable Care Act (ACA) marketplace. It’s important to be prepared for it because it only happens once a year, and if you miss it, you may have to wait until next year if you want to adjust your health insurance plan. [time-brightcove not-tgx=”true”] Here’s everything you need to know about open enrollment. How long is open enrollment? Your open enrollment period depends on where you get your insurance from.