Medicare supplement premiums rarely go down on their own. Most policyholders watch their rates climb year after year and assume they are stuck, because switching carriers usually means answering health questions. Missouri’s Medigap anniversary rule changes that. Every year, around the anniversary of your policy, you get a 60-day window to move to a new carrier on a guaranteed issue basis. We use this rule to keep our clients on the most cost-effective plan year in and year out.
How Missouri’s Medigap Anniversary Rule Works
In Missouri, this rule goes by two names. Some people call it the birthday rule, and others call it the anniversary rule. Both refer to the same protection for Missouri Medicare supplement policyholders.
The 60-Day Switching Window
The window is tied to the anniversary date of your Medicare supplement policy, which is the date the policy took effect. You have the month prior to your anniversary and the month of your anniversary to make a change. That adds up to 60 days each year.
Guaranteed Issue Means No Health Questions
During this window, you can switch Medicare supplements on a guaranteed issue basis. The new carrier cannot ask health questions or decline your application based on your medical history. Your current health has no bearing on whether you are approved.
Key Takeaway: Find your policy anniversary date now. Your 60-day window opens the month before it, and missing it means waiting a full year for the next one.
The Like Plan To Like Plan Requirement
The rule comes with one catch, and it matters. You must switch from like plan to like plan. The anniversary rule is for changing your carrier. Your coverage level stays the same.
What You Can Switch To
If you are on a Plan G, you can move to another Plan G with a different company. The benefits stay exactly the same because Medicare supplement plans are standardized by letter. The only thing that changes is who you pay and how much.
What You Cannot Switch To
A Plan G policyholder cannot use the anniversary rule to move to a different plan letter. That includes:
- Plan F
- Plan N
- Plan K, L, or M
Moving to a different plan letter would require medical underwriting, and the carrier could ask health questions or decline your application.
Pro Tip: If you are unsure which plan letter you have, check the front page of your policy or your ID card. We can also look it up for you during a free review.
Need expert help reviewing your Medicare supplement rate? Contact Senior Benefits Plus for a free consultation.
Why The Anniversary Rule Keeps Missouri Rates Down
Because policyholders can switch every year without underwriting, this rule allows us to keep our clients’ Medicare supplement rates down in the state of Missouri.
Our Annual Rate Review
We track anniversary dates for every client we serve. As your window approaches, we compare your current premium against other carriers offering the same plan letter. If a lower rate is available, we walk you through the switch and make sure your new policy is in place before the old one ends.
Using Missouri’s Medigap Anniversary Rule Year After Year
The rule resets every year, so a single review is never the end of the story. The most cost-effective carrier today may not be the best one next year, so we check each anniversary again to make sure you are not overpaying.
Key Takeaway: Same plan letter, new carrier, no health questions. That is the whole rule, and it can save you money every single year.
Ready to see if a lower rate is waiting for you? Call Senior Benefits Plus today to schedule your free review, and let us put Missouri’s Medigap anniversary rule to work for you.



