Patients & Visitors Sign up for Affordable Health Insurance Enroll in the Health Insurance MarketplaceIn the Missouri Health Insurance Marketplace, you can compare plans, find options to lower your costs and buy health insurance.What is Health Insurance?Health insurance helps you pay for medical care and can protect you from high health care costs, such as emergency room visits and hospital stays. These bills can add up quickly and often cause people to go into debt or even bankruptcy. There are important things to look at when buying health insurance:The health services the plan covers.How much you'll pay for the plan - your monthly premiums.How much you'll pay for things such as doctor visits and prescription medicines - cost-sharing.What is the Health Insurance Marketplace?The Health Insurance Marketplace is a website where you can compare insurance plans, and buy the plan that best fits your needs. Private insurance companies offer health plans sold in the marketplace.You can use the Marketplace if you're an individual or family who doesn't have access to affordable coverage through work. Special Enrollment PeriodsIf you miss open enrollment and have certain life changes, you may qualify for a special enrollment period to start your coverage sooner. Life changes that can qualify you for a special enrollment period:Having a baby, adopting a child, or placing a child for foster careGetting marriedLosing health coverage, including a job-based plan; Medicaid, CHIP or Medicare; or a student health planLosing coverage through a family member's death, divorce or legal separation, or change in dependent status. If you think you qualify for a special enrollment period, start a Marketplace application or log in to an existing one. You'll find out if you qualify, and either way we'll tell you when your coverage starts. When you apply you'll also find out if you qualify for coverage through Medicaid or the Children's Health Insurance Program (CHIP). If you do, coverage can start the day you apply or earlier. Please note that you may need to submit documents to prove you qualify.