Yes, you can.  If you live in a HealthCare.gov state, Open Enrollment for 2024 coverage ends on January 16, 2024.  If you were auto-renewed by the Marketplace in December but still want to change plans, you can make changes until the end of Open Enrollment. The changes would go into effective starting on February 1. After that, you will not be able to change your 2024 plan unless you have a life change that makes you eligible for a special enrollment period.

It is advisable to review your plan options and actively select your plan for next year during Open Enrollment to ensure you have made the choice that is best for you.

State-run Marketplaces can set different dates for Open Enrollment and several have done so.  Check with your state Marketplace for more information.