Missing the annual Open Enrollment window in Missouri does not mean you are locked out of health coverage for the rest of the year. If you have had a qualifying life event, such as losing job-based insurance, getting married, having a baby, or moving to a new county, you can enroll in or switch a Healthcare.gov marketplace plan during a Special Enrollment Period (SEP). Missouri uses the federal marketplace, so the SEP rules below apply whether you live in St. Louis, Kansas City, Springfield, Columbia, or a rural county anywhere in the state. Most qualifying events give you 60 days from the event date to enroll, and one major 2026 rule change eliminated the year-round monthly SEP that some low-income households used to rely on. Because Missouri expanded MO HealthNet in 2021, that change affects Missouri households differently than it affects residents of states that never expanded.
What Is a Special Enrollment Period?
A Special Enrollment Period is a window outside the standard annual Open Enrollment Period when you can sign up for, or make changes to, a marketplace health plan. Open Enrollment for 2026 coverage ran from November 1, 2025, through January 15, 2026. Outside that window, the only way to enroll in Missouri is through an SEP triggered by a qualifying event recognized by Healthcare.gov.
For most Missourians, the SEP window is 60 days. That clock generally starts on the date of the qualifying event, not the date you submit your application, so it pays to act quickly. If you enroll within the first half of your 60-day window, coverage can often start the first day of the following month. Enroll later in the window and your start date may be pushed out further.
Qualifying Life Events That Trigger a Missouri SEP
Healthcare.gov groups qualifying events into four broad categories: loss of coverage, changes in household, changes in residence, and other special situations. Here is what applies in Missouri.
Loss of Health Coverage
- Losing job-based health insurance (layoff, reduced hours, employer drops coverage)
- Aging out of a parent's plan at 26
- Losing eligibility for MO HealthNet (Missouri's Medicaid program) or MO HealthNet for Kids, the state's CHIP program
- Losing coverage through a former spouse after divorce
- Your individual market or COBRA plan ending
- Losing student health coverage after graduation
Changes in Household
- Getting married
- Getting divorced or legally separated and losing coverage as a result
- Having a baby, adopting a child, or placing a child for foster care
- A death in the family that changes household eligibility for a current plan
- Gaining a dependent through a child support order or court order
Changes in Residence
- Moving to Missouri from another state
- Moving within Missouri to a new county with different plan options
- A student moving to or from school in Missouri
- A seasonal worker moving into or out of the state
- Moving to or from a shelter or transitional housing
Other Qualifying Situations
- Gaining U.S. citizenship or lawfully present immigration status
- Leaving incarceration
- Becoming newly eligible for marketplace coverage because your income rose above the MO HealthNet limit
- AmeriCorps members starting or ending service
- A serious medical condition, natural disaster, or other emergency that prevented you from enrolling during Open Enrollment (this exceptional circumstance SEP is reviewed case by case)
- Certain plan-level issues, such as your insurer violating its contract or a mapping error in your current plan
The Big 2026 Change: Low-Income Monthly SEP Is Gone
For several years, anyone with an estimated household income at or below 150% of the federal poverty level could enroll in a marketplace plan any month of the year, not just during Open Enrollment or a standard SEP. That monthly low-income SEP has been eliminated. Congress made the change permanent through federal legislation in 2026, so it is not scheduled to return in future years.
This change lands differently in Missouri than it does in states that never expanded Medicaid. Missouri voters approved Medicaid expansion through a constitutional amendment in 2020, and coverage for the expansion group began in 2021. MO HealthNet now covers adults ages 19 to 64 with household income up to roughly 138% of the federal poverty level, with no asset test for that group. Because MO HealthNet accepts applications year-round with no enrollment deadline, most low-income Missouri adults below 138% FPL already have a coverage path that does not depend on marketplace SEP rules at all.
Where the change still matters in Missouri is the narrow band between about 138% and 150% FPL. Adults in that income range earn too much for the MO HealthNet expansion group but previously could use the monthly low-income marketplace SEP if they missed Open Enrollment. Now, without a separate qualifying event, that group has to wait for the next annual Open Enrollment Period like everyone else. If your income is under 138% FPL, your first stop should be applying for MO HealthNet through the Family Support Division at mydss.mo.gov or 1-855-373-4636, not a marketplace SEP. See our Missouri benefits overview for details on applying.
MO HealthNet for Kids Runs Separately From SEP Rules
Missouri covers children through MO HealthNet for Kids, which includes both Medicaid and CHIP coverage for households with income up to 300% of the federal poverty level. Like the adult expansion group, MO HealthNet for Kids accepts applications year-round and does not require a marketplace-style SEP or Open Enrollment window. Households above roughly 150% FPL typically owe a modest monthly premium for CHIP coverage, with the amount rising as income rises. If your child loses other coverage or your household income changes, apply through the Family Support Division as soon as possible rather than waiting for a marketplace enrollment period.
2026 Federal Poverty Level Reference
| Household Size | 100% FPL (annual) | 138% FPL (annual) | 150% FPL (annual) | 400% FPL (annual) |
|---|
| 1 | $15,960 | $22,025 | $23,940 | $63,840 |
| 2 | $21,640 | $29,863 | $32,460 | $86,560 |
| 3 | $27,320 | $37,702 | $40,980 | $109,280 |
| 4 | $33,000 | $45,540 | $49,500 | $132,000 |
These figures determine both your MO HealthNet eligibility (up to roughly 138% FPL for adults) and your premium tax credit amount if you enroll in a marketplace plan through an SEP. Most Missourians between 138% and 400% FPL qualify for some level of premium subsidy, though 2026 premiums rose sharply for several Missouri carriers, so it is worth comparing plans carefully rather than auto-renewing.
How to Apply for a Missouri SEP
- Confirm your qualifying event and its date. Write down exactly when the event happened. This starts your 60-day clock.
- Gather documentation. Healthcare.gov typically asks for proof of the event: a termination letter or COBRA notice for lost coverage, a marriage certificate, a birth certificate or adoption paperwork, a signed lease or utility bill for a move, or a MO HealthNet denial or closure letter.
- Go to Healthcare.gov. Missouri does not run its own state exchange, so all applications go through the federal marketplace at Healthcare.gov or by calling 1-800-318-2596.
- Report your household income and size. This determines both your premium tax credit eligibility and whether you should be routed to MO HealthNet instead of a marketplace plan.
- Select your event and upload documents. The system will prompt you to describe your qualifying event and attach proof, usually within 30 days of starting your application.
- Choose a plan. Compare available Bronze, Silver, and Gold plans by monthly premium, deductible, and provider network. Silver plans are the only tier eligible for cost-sharing reductions if your income qualifies.
- Pay your first premium. Coverage does not start until you pay, even after your application is approved.
- Get a confirmation of your coverage start date. This depends on when in your 60-day window you enrolled.
You can also work with a licensed insurance agent or a certified navigator at no extra cost. The Cover Missouri Coalition, a project of the Missouri Foundation for Health, connects residents with certified application counselors and navigators statewide. You can search for free local help at FindLocalHelp.CoverMissouri.org, call 1-800-466-3213, or use localhelp.healthcare.gov.
SEP Coverage Start Dates
| When You Enroll | Typical Coverage Start Date |
|---|
| 1st through 15th of the month | 1st of the following month |
| 16th through end of month | 1st of the second following month |
| Birth, adoption, foster placement | Date of the event (retroactive) |
| Marriage | 1st of the month following plan selection |
Birth and adoption are treated differently than most events. Coverage can start on the actual date of birth or adoption, even if you enroll a few weeks later, as long as you are within the 60-day window.
What Happens If You Miss the 60-Day Window
If you do not act within 60 days of a qualifying event, that SEP opportunity closes. You would then need to wait for the next annual Open Enrollment Period, unless a new qualifying event occurs in the meantime. There is no general "hardship" extension outside the narrow exceptional circumstances category, so it pays to apply as soon as possible after a life change. If your income is low enough, remember that MO HealthNet and MO HealthNet for Kids both accept applications year-round, so a missed marketplace SEP does not necessarily mean a coverage gap.
Missouri-Specific Notes
Missouri residents use Healthcare.gov exclusively since the state has not built its own exchange. The Missouri Department of Commerce and Insurance does not process marketplace applications, but it does review rates and regulate the insurers who sell on the exchange, including Anthem Blue Cross Blue Shield, Blue Cross and Blue Shield of Kansas City, Ambetter from Home State Health, UnitedHealthcare, Aetna, Cigna, Oscar, Medica, and Cox HealthPlans. Carrier availability varies widely by county. St. Louis and Kansas City residents often see several competing carriers, while some rural counties have only one or two options, which is exactly why a move within Missouri can qualify as a residence-based SEP. Because Missouri expanded MO HealthNet, working adults with low incomes have a year-round coverage path that does not depend on marketplace enrollment timing, unlike residents of non-expansion states where a marketplace SEP is often the only route to coverage. If your household situation changed and you are unsure whether you qualify for a marketplace SEP, MO HealthNet, MO HealthNet for Kids, or another assistance program, a free eligibility screening can walk through your specific circumstances in a few minutes.
Frequently Asked Questions
How long is the Missouri Special Enrollment Period?
Most qualifying events give you 60 days from the date of the event to enroll in a marketplace plan through Healthcare.gov. Some events, like losing coverage, also allow you to apply up to 60 days before the loss actually occurs.
Does Missouri still have a low-income SEP for people under 150% FPL?
No. The monthly special enrollment period for households at or below 150% of the federal poverty level was eliminated and made permanent by federal legislation in 2026. In Missouri, most adults below 138% FPL already qualify for MO HealthNet year-round, so this change mainly affects the narrow band between 138% and 150% FPL, who now have to enroll during standard Open Enrollment or through a separate qualifying event.
Can I get an SEP just because my income dropped?
Generally, only if the income change causes you to gain new eligibility for premium tax credits, or if it causes you to lose eligibility for MO HealthNet or MO HealthNet for Kids. A drop in income by itself, without a change in program eligibility, is usually not treated as a standalone qualifying event.
What documents do I need for a Missouri SEP application?
It depends on the event. Common documents include a job termination letter, COBRA election or termination notice, marriage certificate, divorce decree, birth or adoption certificate, a new Missouri lease or utility bill, or a MO HealthNet denial or case closure letter.
Can I switch plans during an SEP or only enroll for the first time?
If you already have marketplace coverage and experience a qualifying event, you can typically switch to a different plan within the same or a different metal tier, not just enroll for the first time.
What if I missed Open Enrollment and have no qualifying event?
Without a qualifying event, you generally cannot enroll in a Healthcare.gov marketplace plan until the next Open Enrollment Period. Because Missouri expanded Medicaid, adults with income up to about 138% FPL can still apply for MO HealthNet at any time, and children in households up to 300% FPL can apply for MO HealthNet for Kids year-round regardless of the marketplace enrollment calendar.
Does moving within Missouri count as a qualifying event?
Yes, if the move gives you access to new plan options, such as moving from a rural county served by one or two insurers to a metro county with several. A move within the same service area with no new plan options generally does not qualify.
When is the next Open Enrollment Period for Missouri?
The next annual Open Enrollment Period is expected to run from November 1, 2026, through January 15, 2027, for coverage effective in 2027. Exact dates are confirmed by CMS closer to the fall.
