What Is Open Enrollment for Insurance?
In plain English
Open enrollment is the designated annual period during which individuals can enroll in, change, or drop health, dental, vision, and other insurance plans. For employer-sponsored plans, open enrollment typically occurs in the fall for coverage starting January 1. Marketplace plans have a federally set open enrollment window. Outside this period, you can only change coverage if you experience a qualifying life event.
When Is Open Enrollment for Health Insurance?
For Marketplace (ACA) plans, open enrollment runs November 1 through January 15 in most states, with coverage effective January 1 for plans selected by December 15. Employer-sponsored plan open enrollment varies by company but typically occurs in October or November. Medicare open enrollment runs October 15 to December 7. Missing your window means waiting until next year unless a special enrollment event applies.
What Changes Can You Make During Open Enrollment?
During open enrollment you can enroll in a plan for the first time, switch to a different plan tier or carrier, add or remove dependents from coverage, and elect or change supplemental benefits like dental, vision, FSA, or disability coverage. It is also a good time to review your coverage needs — a life change in the past year might mean a current plan may no longer be the most suitable fit.
What Is a Special Enrollment Period?
A Special Enrollment Period (SEP) allows you to make insurance changes outside of open enrollment when a qualifying life event occurs. Qualifying events include losing job-based coverage, getting married or divorced, having a baby or adopting, moving to a new coverage area, and gaining or losing eligibility for Medicaid. You typically have 60 days from the qualifying event to act on a Special Enrollment Period.
Frequently asked questions
What happens if I miss open enrollment?
If you miss your employer's open enrollment deadline, you're generally locked into your current plan (or without coverage if you were newly eligible) until the next open enrollment unless a qualifying life event triggers a Special Enrollment Period. For Marketplace plans, missing open enrollment means waiting until November unless you have a qualifying SEP event.
Do I need to actively re-enroll each year?
It depends on your plan. Marketplace plans auto-enroll you in the same or a similar plan if you don't make an active selection during open enrollment. However, it's strongly advisable to actively review and re-enroll each year, as your plan may change, better options may be available, and your subsidy eligibility may have shifted based on income changes.
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Related terms
Health Insurance Marketplace
The Health Insurance Marketplace, also called the Exchange, is where individuals and families can shop for ACA-compliant health insurance plans and apply for premium subsidies. Open enrollment runs annually each fall.
COBRA Insurance
COBRA allows you to continue your employer-sponsored health insurance for a limited time after leaving a job. You keep the same coverage but pay the full premium — both your share and your employer's — plus a small administrative fee.
Flexible Spending Account (FSA)
A Flexible Spending Account (FSA) is an employer-sponsored account that lets you set aside pre-tax dollars for qualified medical or dependent care expenses. Unlike an HSA, most FSA funds must be used by year-end.
Health Savings Account (HSA)
A Health Savings Account (HSA) is a tax-advantaged savings account paired with a high-deductible health plan that lets you save pre-tax dollars for qualified medical expenses. Unused funds roll over indefinitely.
Dental Insurance
Dental insurance helps cover the cost of routine dental care, fillings, and major procedures like crowns or root canals. Most plans use a 100/80/50 structure based on the type of care received.