Open enrollment happens once a year, but when and how you can change your plan depends on your type of coverage. Employer-sponsored plans have no federally set enrollment window: each employer picks its own dates. Many companies run enrollment in the fall, often October or November, so changes take effect on January 1, but some hold it in the spring or on a different schedule. Check with your HR department for your company's dates, and don't assume they match the window you've seen advertised.
If you buy coverage through the Health Insurance Marketplace (ACA), federal open enrollment runs from November 1 to January 15 in most states. Enroll by December 15 if you want coverage that starts January 1; if you enroll later, before the January 15 deadline, coverage typically starts February 1. Some states with their own marketplaces set different deadlines, so check yours. Don't miss that window.
Medicare Has Its Own Enrollment Window
If you're on Medicare or turning 65 soon, the dates above don't apply. Medicare's Annual Enrollment Period runs October 15 through December 7 each year, and changes take effect January 1. During that window you can join, switch, or drop Medicare Advantage and Part D prescription drug plans. Medicare Advantage members also get a second window, January 1 through March 31, to switch to a different Advantage plan or return to Original Medicare. It's a different calendar than employer or Marketplace coverage, so track it separately.
What If You Miss Open Enrollment? Special Enrollment Periods
If you miss open enrollment, you may still have options. You can enroll if you have a qualifying life event that triggers a Special Enrollment Period (SEP). Common Marketplace events include:
- Getting married
- Having or adopting a child
- Losing your other health coverage (for example, losing a job or aging off a parent's plan)
- Moving to a new area
- Becoming newly eligible for premium tax credits after an income change or move
Divorce or legal separation by itself does not open a SEP unless you also lose your coverage. You usually have 60 days from the event to enroll through the Marketplace, or up to 90 days if you lost Medicaid or CHIP coverage. Employer plans follow different rules: under federal law, your employer must give you at least 30 days to request enrollment after marriage, birth, adoption, or losing other coverage. Act fast, or you'll wait until the next open enrollment.
WellthCare: A Flexible Window for Add-On Benefits
Traditional employer plans and ACA marketplace plans have fixed windows. WellthCare™, a Health-to-Wealth™ Benefit System, works alongside your existing plan and gets used first. It can be added during open enrollment, or at other times if your employer allows. If your employer offers WellthCare, you don't have to wait to start using $0-co-pay care, earning reward dollars at the WellthCare Store™, and building retirement savings automatically.
How to Make the Most of Open Enrollment
- Mark your calendar as soon as your employer announces dates. Check your benefits portal or HR newsletter.
- Review your current plan and think about what you'll need next year: planned procedures, prescriptions, family changes.
- Compare plans on coverage, deductibles, copays, and out-of-pocket limits.
- Don't forget add-ons like dental, vision, or an FSA. They may have their own enrollment windows.
- Look for new programs your employer is offering, like WellthCare, which adds reward dollars and retirement contributions for verified preventive care.
Open enrollment is your primary, and often your only, chance to change your core health plan. Miss it and you wait until next year or until a qualifying life event. If your employer offers options like WellthCare, which lowers out-of-pocket costs and builds long-term wealth, think about signing up during the window. WellthCare's AI-drafted plans of care, reviewed by a nurse practitioner and physician, give each member personalized recommendations that evolve with their health.
The Bottom Line
Open enrollment varies by coverage type. Employer plans follow dates your company sets, so ask HR for specifics and any new offerings. On an ACA plan, confirm your state's deadlines. Medicare's window is October 15 through December 7. Mark your calendar and act.