If you’re shopping for Medicare Supplement insurance (also called Medigap), you’ll quickly notice two options that sound almost identical: Medicare Supplement Plan G and High Deductible Plan G. Both are built to work alongside Original Medicare (Part A and Part B), and both can dramatically reduce surprise medical bills compared to relying on Medicare alone. Still, the way you pay for that protection is very different.
This guide explains what each plan covers, how the high-deductible version works, who each option tends to fit best, and the key questions to ask before you enroll.
Important note: This is educational, not medical or financial advice. Coverage rules can vary by state and carrier availability, so it’s smart to confirm details before enrolling. Medigap plans are standardized in most states.
What is a Medigap plan?
A Medigap policy is private supplemental insurance that helps pay some of the out-of-pocket costs left by Original Medicare (like deductibles, coinsurance, and copayments). It works only with Original Medicare, not Medicare Advantage.
Medigap plans are standardized by letter in most states, meaning a Plan G from one company must provide the same basic medical benefits as Plan G from another company (though premiums and underwriting rules can differ).
What does Medicare Supplement Plan G cover?
Plan G is one of the most comprehensive Medigap options available to people who are newly eligible for Medicare. It generally helps cover most of what Original Medicare doesn’t pay, including Part A coinsurance and hospital costs, Part B coinsurance, and other standardized benefits shown in Medicare’s plan comparison chart. A key point many people miss: Plan G does not cover the Medicare Part B deductible.
Plan G also covers Part B excess charges in states where they’re allowed. Excess charges can apply when a provider doesn’t accept Medicare assignment and charges above the Medicare-approved amount (within Medicare’s limits).
So in simple terms, standard Medicare Supplement Plan G is designed for people who like predictable coverage and prefer fewer surprise bills when they use medical care.
What is High Deductible Plan G?
High Deductible Plan G is a version of Plan G that trades a lower monthly premium (in many cases) for a higher amount you must pay out of pocket before the plan starts paying. Here’s the simplest way to understand it:
With High Deductible Plan G, you pay Medicare-approved cost-sharing yourself until you meet the plan’s annual high deductible.
After you meet that deductible, the plan coverage functions like Plan G for the rest of the year (based on standardized benefits).
High Deductible Plan G is available under federal Medigap rules, and CMS publishes annual deductible announcements for these high-deductible Medigap options.
High Deductible Plan G is available to people who are “new to Medicare” on or after 1/1/2020 under the rules CMS explains for high-deductible Medigap plans.
Plan G vs. High Deductible Plan G: The real difference
Both plans aim to protect you from the same categories of gaps in Original Medicare. The difference is when your Medigap plan starts paying.
Standard Plan G (typical experience)
You generally pay your Part B deductible each year
After that, the plan covers many of the remaining standardized gaps (based on Medicare’s benefits chart), which can make costs more predictable.
High Deductible Plan G (typical experience)
You pay your Part B deductible (since Plan G doesn’t cover it).
Then you continue paying Medicare-approved cost-sharing until you reach the high deductible.
After you hit it, the plan steps in according to Plan G's standardized benefits for the rest of the year.
So the choice is less about “which plan is better” and more about how you prefer to budget risk:
Pay more each month for more predictable coverage (Plan G), or
Pay less each month but accept higher potential out-of-pocket exposure in a year you use more care (High Deductible Plan G).
Who is Plan G usually best for?
Standard Medicare Supplement Plan G often fits people who:
Want fewer surprise bills when they go to the doctor, specialist, outpatient facility, or hospital.
Use care regularly (chronic conditions, frequent appointments, ongoing monitoring).
Prefer predictable budgeting month to month.
Want protection from Part B excess charges where applicable.
It can also be a strong fit if you value simplicity: fewer “what will this visit cost?” moments.
Who is the High Deductible Plan G usually best for?
High Deductible Plan G can make sense for people who:
Are generally healthy and don’t anticipate frequent medical use.
Have savings set aside and feel comfortable covering higher out-of-pocket costs in a worst-case year.
Prefer lower fixed monthly costs, even if a high-use year would cost more overall.
Want Plan G-style protection after the deductible is met, especially for unexpected events.
This plan is often about risk tolerance. If you’re the kind of person who would rather “self-insure” routine care and keep monthly costs lower, the high-deductible route can be appealing.
Don’t overlook enrollment timing and underwriting.
One of the biggest “make or break” issues with Medigap isn’t the letter plan; it’s when you apply.
During your Medigap Open Enrollment Period (generally the 6 months after you’re 65+ and enrolled in Medicare Part B), you typically have strong consumer protections, and companies can’t use medical underwriting to deny you or charge more due to health status.
Outside that window, you may be subject to underwriting depending on your situation and state rules.
Because underwriting rules and guaranteed-issue rights can get complicated fast, many people talk with an advisor like HCA Insurance & Senior Solutions to compare carriers, confirm eligibility, a
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