Health Insurance Open Enrollment 2027: Dates, Deadlines & What Changed
If you buy your own health insurance through the ACA Marketplace, there is an important change coming for 2027: the federal Open Enrollment period is getting shorter.
For people using HealthCare.gov, Open Enrollment for 2027 coverage will run from November 1 through December 15, 2026. Coverage selected during that period will begin January 1, 2027.
That is different from the schedule used for 2026 coverage, when federal Open Enrollment continued until January 15.
If you remember having until January to sign up in previous years, do not assume you have that extra month this time.
2027 Health Insurance Open Enrollment Dates
| Date | What Happens |
|---|---|
| November 1, 2026 | Open Enrollment begins on HealthCare.gov for 2027 coverage |
| December 15, 2026 | Open Enrollment ends for Exchanges using the federal platform |
| January 1, 2027 | Coverage selected during Open Enrollment begins |
Important: These are the dates for Exchanges operating on the federal platform, including HealthCare.gov. If your state operates its own Marketplace, its dates may be different.
Why Did the Open Enrollment Deadline Change?
For the past several years, people using HealthCare.gov generally had from November 1 through January 15 to enroll in Marketplace coverage.
The Centers for Medicare & Medicaid Services changed the rules beginning with coverage for plan year 2027.
Under the new rules, Exchanges using the federal platform will have an Open Enrollment period running from November 1 through December 15. Plans selected during Open Enrollment will take effect January 1.
CMS said the shorter enrollment period is intended to simplify coverage start dates, encourage people to maintain continuous coverage and reduce the ability to wait until a medical need appears before buying insurance.
The practical consequence is simple: people who previously waited until January to choose a Marketplace plan may be too late for 2027 coverage.
Does Every State Have a December 15 Deadline?
No.
States that operate their own health insurance Exchanges have some flexibility to set their own Open Enrollment dates.
Beginning with plan year 2027, the federal rules generally require an Exchange’s Open Enrollment period to:
- Begin no later than November 1
- End no later than December 31
- Last no more than nine weeks
- Provide a January 1 effective date for plans selected during Open Enrollment
That means a state Marketplace may give residents more time than HealthCare.gov does, but consumers should not assume that their state’s deadline is January 15.
If you live in a state with its own Marketplace, check that Marketplace’s 2027 dates before relying on the federal December 15 deadline.
Why Do Some Websites Still Say Open Enrollment Ends January 15?
You may see conflicting information online, including pages that still describe Marketplace Open Enrollment as running from November 1 through January 15.
That was the schedule for recent coverage years, including the Open Enrollment period for 2026 coverage.
The change takes effect with plan year 2027. CMS’s final rule specifically sets the federal-platform Open Enrollment period at November 1 through December 15 beginning with 2027 coverage.
When checking an enrollment deadline, make sure the information you are reading specifically refers to 2027 coverage rather than a prior year or a general Marketplace description that has not yet been updated.
When Should You Start Shopping for a 2027 Plan?
You do not need to buy a plan on November 1, but there is little advantage to waiting until the last minute.
Once 2027 plans and prices become available, compare:
- Your monthly premium
- Your deductible
- Your maximum out-of-pocket cost
- Your doctors and hospitals
- Your prescription drug coverage
- Your plan’s provider network
- Any premium tax credit or other financial assistance for which you qualify
If terms like deductible, coinsurance and out-of-pocket maximum still feel confusing, start with our guide to how health insurance works.
You can also read our ACA Marketplace plans guide for a broader explanation of buying individual health insurance through the Marketplace.
Do You Need to Re-Enroll If You Already Have Marketplace Insurance?
Do not assume that keeping the same plan without looking at your options is the best choice.
Plans, premiums, provider networks, prescription formularies and financial assistance can change from one year to the next. Your own household income or family situation may have changed as well.
Even if automatic re-enrollment is available to you, Open Enrollment is a good time to update your information and compare your current coverage with the other 2027 plans available in your area.
A plan that was a good value in 2026 may not be the best value in 2027.
What Happens If You Miss the December 15 Deadline?
If you use HealthCare.gov and do not enroll during the 2027 Open Enrollment period, you generally cannot simply come back in January and buy a Marketplace plan because you changed your mind.
You may still be able to enroll if you qualify for a Special Enrollment Period.
Qualifying events can include situations such as:
- Losing qualifying health coverage
- Getting married
- Having or adopting a child
- Certain moves
- Other qualifying changes in your circumstances
The rules depend on the event, and there are deadlines for using a Special Enrollment Period.
Medicaid and the Children’s Health Insurance Program, or CHIP, have different enrollment rules and generally accept applications throughout the year.
What If You Lose Job-Based Health Insurance After December 15?
Losing qualifying employer health coverage can create a Special Enrollment Period, so missing the annual Open Enrollment deadline does not necessarily mean you must remain uninsured for the entire year.
Depending on your circumstances, you may have several choices, including Marketplace coverage or continuing your former employer’s plan through COBRA.
The right comparison is usually not just the monthly premium. Look at the subsidy available through the Marketplace, deductibles, provider networks, prescription coverage and how long you expect to need the replacement insurance.
Is December 15 the Deadline for Employer Health Insurance Too?
No.
Employers set their own enrollment periods for job-based health plans. Your company’s benefits enrollment may happen in October, November, December or at another time entirely.
The December 15 deadline discussed here applies to 2027 coverage through Exchanges using the federal Marketplace platform.
Is Medicare Open Enrollment the Same Thing?
No. Medicare has separate enrollment periods.
The Medicare Annual Enrollment Period generally runs from October 15 through December 7. That is when people already in Medicare can make certain changes to Medicare Advantage and prescription drug coverage.
Marketplace Open Enrollment and Medicare Open Enrollment sound similar but apply to different types of insurance and different groups of people.
For an introduction to those choices, see our guide to Medicare vs. Medicare Advantage.
What Should You Do Before November 1?
You do not have to wait until Open Enrollment begins to get organized.
Before November, gather:
- Your best estimate of household income for 2027
- Information about everyone who needs coverage
- A list of doctors and hospitals you want to keep using
- Your regular prescription medications
- Your current plan information
- Any notices you receive about renewal or changes to your current coverage
Having this information ready makes it much easier to compare plans once 2027 options are available.
Frequently Asked Questions About 2027 Open Enrollment
When does health insurance Open Enrollment start for 2027?
For Exchanges using the federal platform, Open Enrollment begins November 1, 2026.
When does HealthCare.gov Open Enrollment end for 2027?
The federal-platform deadline for 2027 coverage is December 15, 2026.
Didn’t Open Enrollment used to end January 15?
Yes. The federal Marketplace used a January 15 deadline for recent coverage years, including 2026 coverage. Beginning with plan year 2027, the federal-platform Open Enrollment period changes to November 1 through December 15.
When will my 2027 health insurance start?
Coverage selected during the 2027 annual Open Enrollment period is scheduled to take effect January 1, 2027.
Can my state have a different deadline?
Yes. State-based Exchanges can establish their own Open Enrollment dates within federal limits. Beginning with plan year 2027, those periods must end by December 31 and may last no more than nine weeks.
Can I get health insurance after Open Enrollment?
Possibly. You may qualify for a Special Enrollment Period because of an eligible life event such as losing other coverage, marriage, birth or adoption, or certain moves. Medicaid and CHIP also have different enrollment rules.
Don’t Assume You Have Until January
The most important change for 2027 is easy to remember: if you use HealthCare.gov, plan on December 15, 2026 being your deadline.
That is a month earlier than the January deadline many Marketplace customers have become accustomed to.
Start comparing plans once 2027 options become available, confirm the deadline that applies in your state, and give yourself time to check premiums, deductibles, prescriptions and provider networks before making a decision.
Health-Insurance.guru provides general educational information and is not a licensed insurance agency. Marketplace rules and plan availability can vary by state and individual circumstances. Verify current enrollment information with the Marketplace that serves your state.
Sources
- Centers for Medicare & Medicaid Services — 2025 Marketplace Integrity and Affordability Final Rule
- Centers for Medicare & Medicaid Services — Special Enrollment Periods Job Aid, March 2026
- HealthCare.gov — Marketplace enrollment and Special Enrollment Period information