Switching Medigap plans can feel overwhelming. Most people assume they can change policies anytime. That is not true. Federal law only guarantees one chance to buy Medigap without health questions. After that window closes, insurers can deny you coverage. They can also charge higher premiums based on your health. Understanding when and how you qualify for switching Medigap plans is essential. The rules depend on your age, your enrollment timeline, and your state. Some situations give you guaranteed issue rights to switch without medical underwriting. This guide covers every path available in 2026.
When Can You Switch Medigap Plans Without Underwriting?
The federal government does not offer an annual open enrollment for Medigap. Instead, your main protection is the Medigap Open Enrollment Period. This is a one-time, six-month window. It starts the first month you are both 65 or older and enrolled in Medicare Part B. During these six months, no insurer can deny you any Medigap policy they sell. They cannot charge more due to health conditions. They cannot exclude pre-existing conditions. This is your strongest opportunity for switching Medigap plans freely.
Outside that window, you need guaranteed issue rights to switch without medical underwriting. These rights apply in specific situations defined by federal law. You must act within strict deadlines. The table below summarizes the key windows available in 2026.
| Enrollment Window | Duration | Deadline to Apply | Underwriting Required? |
|---|---|---|---|
| Medigap Open Enrollment Period | 6 months | Starts month you turn 65 + have Part B | No |
| Medicare Advantage Trial Right | 12 months | Within 12 months of first joining MA | No |
| Guaranteed Issue — Plan Discontinued | 63 days | 63 days from discontinuation notice | No |
| Guaranteed Issue — Loss of Coverage | 63 days | 63 days from coverage end date | No |
| State Birthday Rule (CA, OR, etc.) | 30–63 days | Varies by state — around your birthday | No |
| Outside All Protected Windows | Anytime | No deadline | Yes — may be denied |
Who Is Eligible for Switching Medigap Plans?
Eligibility depends on your situation. During the initial six-month Medigap Open Enrollment Period, every person aged 65 or older with Part B is eligible. No exceptions. No health questions. This is the broadest protection available. If you turned 65 in January 2026 and enrolled in Part B that month, your window runs from January through June 2026.
Guaranteed issue rights apply to specific qualifying events. You qualify if your Medigap insurer goes bankrupt or discontinues your plan. You qualify if your employer group health plan or COBRA coverage ends. You also qualify if you joined a Medicare Advantage plan for the first time and want to return to Original Medicare within 12 months.
Some states offer additional protections. California, Connecticut, Maine, Massachusetts, New York, Oregon, and Washington have expanded rights. Oregon and California have a “birthday rule.” This lets you switch to any Medigap plan of equal or lesser value during a window around your birthday each year. Contact your State Health Insurance Assistance Program (SHIP) at 1-800-633-4227 for your state’s rules.
What Can You Do When Switching Medigap Plans?
During a guaranteed issue period, you can switch from one Medigap plan to another. For example, you might move from Plan F to Plan G to save on premiums. You can also switch insurance companies while keeping the same plan letter. The new insurer must accept you without health questions. They cannot impose a waiting period for pre-existing conditions.
The Medicare Advantage trial right is especially valuable. If you dropped your Medigap policy to try Medicare Advantage, you have 12 months to change your mind. You can return to Original Medicare and get your old Medigap policy back. The insurer must sell it to you if they still offer it. If they no longer sell that plan, you can buy Medigap Plan A, B, C, F, K, or L from any company in your area. You must apply within 63 days after your Medicare Advantage coverage ends.
When switching Medigap plans, your new policy gets a fresh 30-day free-look period. You can cancel within those 30 days for a full refund. Keep your old policy active until the new one is confirmed. Never cancel your current Medigap plan before the replacement is in place.
What Happens If You Miss This Deadline?
Missing your guaranteed issue deadline has serious consequences. Insurance companies can use medical underwriting to evaluate your application. They will ask about your health history. They can deny coverage entirely. They can also charge significantly higher premiums based on your age and health status. Pre-existing conditions can be excluded for up to six months.
There is no federal penalty like the Part B late enrollment penalty. However, the practical penalty is severe. If you develop a health condition after your open enrollment window closes, switching Medigap plans becomes difficult or impossible. A 70-year-old with diabetes may be denied coverage by every insurer in their state. The financial impact can be thousands of dollars per year in higher out-of-pocket costs.
If you miss a deadline, check your state’s rules immediately. Some states require insurers to offer at least one plan to all applicants. You can also look into Medicare Advantage as an alternative. Medicare Advantage plans cannot deny you during their Annual Enrollment Period (October 15 – December 7, 2026). But switching from Medigap to Medicare Advantage is a one-way door in most states.
Step-by-Step: How to Switch Your Medigap Plan
Step 1: Confirm your guaranteed issue rights. Identify which qualifying event applies to you. Gather proof such as termination letters, disenrollment notices, or plan discontinuation notices. You will need these documents when you apply.
Step 2: Compare Medigap plans in your area. All Medigap plans with the same letter offer identical benefits regardless of insurer. The only difference is price and customer service. Use the Medicare Plan Finder at Medicare.gov to compare premiums. In 2026, Plans F and G have an annual deductible of $2,950 for high-deductible versions. Plan K has an out-of-pocket maximum of $8,000. Plan L has a $4,000 maximum.
Step 3: Apply to your chosen insurer within the deadline. Submit your application with all supporting documents. Most applications can be completed online, by phone, or by mail. Keep copies of everything. Step 4: Wait for your 30-day free-look period to begin. Do not cancel your old policy until the new one is active. Once confirmed, contact your previous insurer to cancel. Request written confirmation of cancellation.
Common Mistakes to Avoid
Canceling your old plan too early. Many people cancel their current Medigap policy before the new one starts. This creates a dangerous gap in coverage. Always overlap your old and new policies by at least one month. The extra premium is worth the protection.
Assuming you can switch anytime. This is the most costly mistake. People wait years and assume switching Medigap plans works like switching car insurance. It does not. Outside guaranteed issue periods, you may be denied entirely. Start researching your options well before any deadline arrives.
Ignoring state-specific rights. Federal rules are the floor, not the ceiling. Your state may offer annual enrollment windows or birthday rules. Failing to check your state’s protections means missing free opportunities. Call SHIP at 1-800-633-4227 or visit your state insurance department website to learn what applies to you. Also avoid switching Medigap plans based solely on premium. A cheaper plan may cover less. Always compare the plan letter benefits, not just the monthly cost.
Frequently Asked Questions
Can I switch Medigap plans during Medicare’s Annual Enrollment Period?
No. The Annual Enrollment Period (October 15 – December 7) applies to Medicare Advantage and Part D drug plans only. Switching Medigap plans follows completely separate rules. Your Medigap rights depend on your initial open enrollment period and guaranteed issue events.
Do all states allow switching Medigap plans without medical underwriting?
Federal law guarantees certain rights in every state. However, some states go further. New York, Connecticut, and Massachusetts require insurers to accept all applicants year-round. Oregon and California offer annual birthday-window switching. Check with your state insurance department for the rules that apply to you.
What documents do I need when switching Medigap plans under guaranteed issue rights?
You need proof of your qualifying event. This includes plan cancellation letters, COBRA termination notices, Medicare Advantage disenrollment confirmations, or employer coverage loss letters. Keep all correspondence from your current insurer. Submit copies with your new application within the 63-day deadline.
Can I switch from Medigap Plan F to Plan G to save money?
Yes, but only during a protected enrollment window. Plan G covers the same benefits as Plan F except the Part B deductible ($257 in 2026). Many people save more on the lower Plan G premium than they spend on the deductible. If you have guaranteed issue rights, switching Medigap plans from F to G is straightforward and requires no health questions.
Compare Medicare Plans
Ready to explore your Medicare options? Use the official Medicare Plan Finder or contact your local SHIP counselor for free, unbiased help.
Official Sources & Resources
For verified Medicare information and enrollment help:
- Medicare.gov: medicare.gov
- CMS.gov: cms.gov
- NAIC Medigap Guide: naic.org
- KFF Medicare Research: kff.org/medicare
- Find Your SHIP: medicare.gov/contacts
Content last reviewed April 2026. If you notice any outdated information, please contact us.