Yes. If you already have a Medicare Supplement policy in Missouri, you may be able to switch to another company once a year without answering health questions.
That is Missouri’s Medigap anniversary rule.
The important part is that the rule is narrow. It is not a new chance to buy any Medigap plan you want, and it is not the same as the fall Medicare Annual Enrollment Period. In most cases, it lets you move from your current Medigap plan letter to the same plan letter with another company around your policy anniversary date.
What Is the Missouri Medigap Anniversary Rule?
Missouri has a state Medigap switching rule tied to your policy anniversary date.
In plain English, if you already have a Missouri Medicare Supplement policy, you may get a yearly window to shop the same plan letter with another insurance company without medical underwriting.
That matters because Medigap benefits are standardized. One company’s Plan G has the same basic medical benefits as another company’s Plan G. The price, rate history, service experience, and household discount rules can differ.
So the rule can be useful when your premium has crept up and you want to see whether another company offers the same coverage at a better price.
When Is the Anniversary Window?
The window is based on your current Medigap policy’s anniversary date.
That usually means the date your policy first became effective, not your birthday and not October 15.
Missouri’s rule is commonly described as a 60-day window: 30 days before and 30 days after the policy anniversary date. The practical planning point is simple: find your current policy’s effective date and start comparing before that date arrives.
You can usually find the date on:
- your policy schedule page
- your declarations page
- your current company’s online account
- a recent rate notice
- a call to the insurance company
Do not guess at the date. If you miss the window, the same application may require health questions.
What Can You Switch To?
For most people, the clean move is a same-letter switch.
Examples:
- Plan G to Plan G
- Plan N to Plan N
- Plan F to Plan F, if you already have Plan F and are eligible to keep it
The rule is useful because you are comparing companies, not changing the basic benefit design.
If you have Plan G and want to move to Plan N to lower the premium, that is a different decision. It may still be possible, but it is not the same protected same-plan move. You may have to answer health questions unless another guaranteed issue right applies.
If you want help understanding the Plan G and Plan N tradeoff, read Plan G vs Plan N in Missouri: Which One Actually Saves You Money?.
What the Rule Does Not Do
This is where people get into trouble.
Missouri’s anniversary rule does not mean everyone in Missouri gets an annual Medigap open enrollment period.
It generally does not help if:
- you only have Original Medicare and never bought Medigap
- you are in Medicare Advantage and want to move to Medigap
- you want to change to a richer or different Medigap plan letter
- you missed your policy anniversary window
- your current coverage is not a Medigap policy
If you are trying to move from Medicare Advantage to Medigap, start here instead: Can You Switch From Medicare Advantage to Medigap Later?.
Why This Rule Matters in Missouri
In many states, once your one-time Medigap Open Enrollment Period is over, switching Medicare Supplement companies can require medical underwriting.
Medicare explains the federal baseline this way: your Medigap Open Enrollment Period starts when you are 65 or older and enrolled in Part B, and it lasts for 6 months. During that window, companies generally cannot deny you a Medigap policy because of health problems.
After that window, the rules are different. Unless you have a guaranteed issue right, a company may be allowed to review your health before accepting the application.
Missouri’s anniversary rule gives current Missouri Medigap policyholders a state-level switching opportunity that many other states do not have. That can be valuable when a person is healthy or not, because the point is to compare the same coverage without turning the application into a health review.
A Simple Example
Say you bought a Missouri Medigap Plan G that started on July 1, 2023.
Each year, your policy anniversary is tied to July 1. If your premium has increased, you could compare other Missouri Plan G companies before that anniversary period and see whether a same-letter switch makes sense.
Now change the facts.
Say you have Plan G and want to switch to Plan N because the monthly premium looks lower. That may be a reasonable conversation, but it is not the same as moving Plan G to Plan G. Plan N has different cost-sharing. You need to compare the premium savings against the doctor visit copays, emergency room copays, and possible Part B excess charge exposure.
That is not just paperwork. It changes how the coverage works.
Should You Switch Just Because the Premium Is Lower?
Not automatically.
Because Medigap plan letters are standardized, price matters. But it is not the only thing I would check.
Before switching, look at:
- the new company’s current premium
- household discount rules
- rate increase history
- how the application handles the Missouri anniversary rule
- when the new policy would start
- when the old policy should be canceled
The last two points are important. Do not cancel the old policy before the new policy is approved and the effective date is clear.
If the savings are small, it may not be worth creating administrative risk. If the savings are meaningful and the new company is solid, the rule can be worth using.
How This Differs From Medicare Annual Enrollment
The fall Annual Enrollment Period runs from October 15 through December 7, but that period is mainly for Medicare Advantage and Part D changes.
It is not a general Medigap shopping season.
That is one reason Missouri’s rule is easy to misunderstand. People hear “annual” and assume it means the same fall Medicare window. It does not. Your Medigap anniversary window is tied to your policy, so your date may be in March, July, November, or any other month.
For drug plan review, the fall window is still important. If you have Original Medicare plus Medigap, you usually also need a separate Part D plan. Read How to Compare Medicare Part D Plans Without Guessing before letting last year’s drug plan renew without checking it.
What If You Live on the Kansas Side of the Metro?
This article is specifically about Missouri’s Medigap anniversary rule.
If you live in Kansas, do not assume the same rule applies. Medigap switching rights are partly federal and partly state-specific. A person in Lee’s Summit and a person in Overland Park may have different state Medigap rules even though they live in the same Kansas City metro.
For people near the state line, that is one more reason to verify your actual state of residence and the state where your Medigap policy was issued before making a switch.
What I Tell Missouri Clients
For clients in Blue Springs, Independence, Lee’s Summit, and the broader Kansas City metro, I treat the anniversary rule as a review opportunity, not an automatic replacement trigger.
The question is not just, “Can we find a cheaper premium?”
The better question is:
- Are you still happy with your Medigap plan letter?
- Has the premium increased enough to justify shopping?
- Is your anniversary window coming up?
- Can another company offer the same plan letter at a meaningful savings?
- Can the switch be handled cleanly without a coverage gap?
That is a practical review. It protects the part of the coverage that is already working while checking whether the price still makes sense.
Practical Next Steps
If you have a Missouri Medigap policy and want to use the anniversary rule, start with these steps:
- Confirm your current Medigap plan letter.
- Find your policy effective date or anniversary date.
- Compare the same plan letter with other Missouri insurers.
- Ask whether the application is being handled under the Missouri anniversary rule.
- Keep your current policy until the new policy is confirmed.
If you are not sure whether you have Medigap or Medicare Advantage, check that first. The rule depends on what type of coverage you have now.
Official Sources
For the federal Medigap background, Medicare’s pages on when you can buy Medigap, changing a Medigap policy, and Medigap costs are good starting points.
For the Missouri rule itself, see Missouri’s published Medicare Supplement regulation, 20 CSR 400-3.650, from the Missouri Secretary of State.
Frequently Asked Questions
Can I switch Medigap plans anytime in Missouri?
You can apply to switch at other times, but outside protected windows you may have to answer health questions. Missouri’s anniversary rule may let current Medigap policyholders switch to the same plan letter around their policy anniversary without medical underwriting.
Is Missouri’s Medigap anniversary rule based on my birthday?
No. It is tied to your Medigap policy anniversary date, which is usually based on the policy effective date. It is not based on your birthday.
Can I switch from Plan G to Plan N under the Missouri anniversary rule?
Usually no. The protected move is generally a same-letter switch, such as Plan G to Plan G. Moving from Plan G to Plan N changes the benefit design and may require underwriting unless another right applies.
Does the anniversary rule help if I have Medicare Advantage?
No. The Missouri anniversary rule is for people who already have a Medigap policy. If you have Medicare Advantage and want Medigap, you need to review Medicare Advantage enrollment periods, trial rights, guaranteed issue rights, and possible underwriting.
Should I cancel my current Medigap policy before applying for the new one?
No. Keep your current policy until the new policy is approved and the new effective date is clear. Canceling first can create avoidable risk.