Open Enrollment 2026 Deadlines: The Four Dates That Decide Your Coverage
Medicare, the Marketplace and your job each run their own open enrollment. The four dates that matter this fall, which one is yours, and when coverage actually starts.
The open enrollment 2026 deadlines depend on where your health coverage comes from. Medicare open enrollment runs October 15 to December 7, 2026. The HealthCare.gov Marketplace opens November 1, 2026: pick a plan by December 15 for coverage on January 1, or by January 15, 2027, for coverage on February 1. Plans through work follow your employer's own window.
Open enrollment sounds like one season. It is really three, run by three different systems, and they overlap in November. Most of the confusion online comes from mixing them up, or from mixing up this fall's dates with last year's. Below are the dates as listed on HealthCare.gov and Medicare.gov on October 5, 2026.
What are the open enrollment dates for 2026?
Find the line that matches where your coverage comes from:
| Coverage | Window | Coverage starts |
|---|---|---|
| Medicare (Advantage and drug plans) | October 15 to December 7, 2026 | January 1, 2027 |
| HealthCare.gov Marketplace | November 1, 2026 to January 15, 2027 | January 1 if you pick by December 15; February 1 if you pick December 16 to January 15 |
| State-run Marketplace | Set by your state | Check your state's site |
| Job-based plan | Set by your employer | Usually January 1, or your plan year |
For the Marketplace, the HealthCare.gov dates and deadlines page lists November 1 as the first day to enroll, renew or change plans for 2027, December 15 as the last day for coverage that starts January 1, and January 15 as the day open enrollment ends. Coverage also needs your first premium paid.
When is Medicare open enrollment for 2026?
October 15 to December 7, 2026. According to Medicare.gov, this is when you can join, drop or switch a Medicare Advantage plan or a drug plan, or move between Original Medicare and Medicare Advantage. The new plan must receive your request by December 7, and coverage starts January 1.
If you are already in a Medicare Advantage plan, there is a second window from January 1 to March 31 to switch to another Advantage plan or go back to Original Medicare.
Does open enrollment end December 15 or January 15?
On HealthCare.gov it ends January 15, 2027. December 15 is a different deadline: the last day to pick a plan if you want it to start January 1. You may still find pages saying the Marketplace window now closes December 15. As of October 5, 2026, HealthCare.gov lists January 15. If your state runs its own Marketplace, its dates can be different, so check its site before you count on January.
When is open enrollment through work?
Your employer sets it. Many hold it in the fall, but there is no national date. Look for an email from HR or the benefits platform with the window and the plan year. If you have not seen one by mid-October, ask. The HealthCare.gov glossary says it plainly: job-based plans may have different open enrollment periods.
Missing the work window usually means you keep this year's choices until next year, unless something changes in your life. That includes your FSA election, which has its own end-of-year deadline.
Which open enrollment is mine?
Start from where the card in your wallet comes from:
- You have Medicare. Your window is October 15 to December 7. The Marketplace dates do not apply to you.
- You buy your own plan. Your window is the Marketplace one: HealthCare.gov, or your state's own site if it runs one.
- You get coverage through a job. Your window is the one HR sends. The Marketplace dates matter only if you plan to leave the job plan.
- You have Medicaid or CHIP, or think you qualify. You can apply any time of year.
Many households have two of these at once, for example one partner on a work plan and one on the Marketplace. Then there are two deadlines to hold, and they rarely fall in the same week.
What if I miss open enrollment?
You may still get coverage through a Special Enrollment Period if you have a life event like losing other coverage, moving, getting married or having a baby. HealthCare.gov says you usually have 60 days before or after the event to enroll, and job-based plans must give at least 30 days. Medicaid and CHIP accept applications any time of year.
What to check before your window opens
Ten minutes in October saves a rushed night in December:
- Which of the four windows is yours, and the exact last day.
- The day coverage starts if you pick on time.
- Whether your current plan renews on its own or needs action.
- Your doctors and prescriptions, to check against next year's network and drug list.
- Next year's premium and deductible, compared with this year's.
- Your FSA or HSA election, if your job offers one.
- Who else in the household needs a decision.
Let Tracy hold the date
dEssence keeps these dates for you. Tell Tracy in your own words which window is yours, or forward her the HR email or a photo of the benefits page; on Pro, a document you send turns into dates and reminders. Ask for a reminder a week before the last day, and another the day before. She does not connect to HealthCare.gov, Medicare or your employer's benefits site, so the choice of plan stays with you. She keeps what you send and comes back on the dates you asked for.
Frequently asked questions
When does open enrollment start for 2027 coverage?
November 1, 2026 on HealthCare.gov. Medicare open enrollment starts earlier, on October 15.
What is the last day to enroll for January 1 coverage?
December 15, 2026 on HealthCare.gov, with the first premium paid. For Medicare, December 7.
Can I change my plan after open enrollment?
Only with a Special Enrollment Period after a qualifying life event, or in the Medicare Advantage window from January 1 to March 31 if you are already in an Advantage plan.
Is open enrollment the same for every state?
No. States that run their own Marketplace can set different dates. HealthCare.gov dates apply to states that use HealthCare.gov.