Open Enrollment Is Here. Watch Out for These Common Mistakes. ACA Marketplace Open Enrollment is underway, which means it's time to review your health insurance options for 2027. Whether you're renewing your current coverage or shopping for something different, don't rush through the process. Plan details and your own healthcare needs can change from year to year. Here are six mistakes to avoid before you enroll. Mistake #1: Automatically Choosing the Cheapest Premium The mon