Medigap Plan G Premium Increases in 2026

If you are about to enroll in Medicare, you have probably heard more chatter lately about Medicare Supplement insurance (also called Medigap) and the Medigap Plan G premium increases in 2026, as we head into the new year.

The key is to understand what Medigap actually does, why your first choice matters so much, and how to compare Plan G with lower-premium options like High-Deductible Plan G without getting pulled into confusing marketing.

What Medicare Supplement (Medigap) Covers and Why It Matters

Original Medicare has gaps. For many Part B services, you usually pay 20% of the Medicare-approved amount after you meet your deductible.
That 20% can add up quickly with frequent doctor visits, outpatient procedures, imaging, and other ongoing care.

Medigap is designed to help cover certain out-of-pocket costs left behind by Original Medicare, which can reduce your financial risk and make costs more predictable.

The Medigap Open Enrollment Window That Can Shape Your Long-Term Costs

Here is the rule many people miss: you get a one-time 6-month Medigap Open Enrollment Period. It starts the first month you have Medicare Part B and are 65 or older. 
During this window, you can buy any Medigap policy sold in your state, and the company cannot deny you coverage because of pre-existing health conditions.

After that window, in most states, there is no federal guarantee you can switch Medigap plans or companies, and medical underwriting may apply. (Medicare.gov)

Why “Just Switch Later” Often Does Not Work

You will see ads that say “switch and save” on Plan G, but switching is not always simple. In most cases, you do not have a right under federal law to switch Medigap policies unless you are in your open enrollment window or qualify for a guaranteed issue right.

That is why picking your Medigap plan when you first enroll can feel like a long-term decision.

Plan G vs High-Deductible Plan G: A Practical Comparison

Plan G is popular because it offers strong coverage and can make costs feel more predictable month to month. High-Deductible Plan G can cost less in monthly premium, but you agree to pay more out of pocket before the plan starts paying.

Here is a simple way to compare the two:

State Rules Can Change Your Options (New York Is a Common Example)

Medigap rules are partly federal and partly state-based. A small number of states require continuous or annual guaranteed issue protections for Medigap, meaning people may have more flexibility to enroll or switch regardless of medical history. (KFF.org)

New York is known for consumer-friendly Medigap rules, including open enrollment and community rating, which affects how plans are priced and how easy it is to get coverage.

Where you live can meaningfully change your Medigap strategy.

How to Make a Confident Medigap Choice Before You Enroll

A smart decision usually comes down to three things:

1. Your risk comfort level: Are you okay with a higher potential bill early in the year to keep premiums lower?

2. Your health care usage: Do you expect frequent services that make predictability more valuable?

3. Your ability to change later: In many places, you may not be able to switch plans easily after your initial window.

If you are enrolling in Medicare for the first time and want help comparing these options in plain English, The Medicare Coach can guide you through the rules and the plan math with our Medicare Enrollment Concierge services, so you can choose confidently instead of guessing.

Conclusion

Medigap can be a powerful way to control your out-of-pocket exposure in Original Medicare, but the best choice depends on your budget, your health care needs, and whether you will realistically be able to change plans later. If you are about to enroll, are you choosing based on clear numbers and rules, or based on a plan name that just sounds familiar?