Medicare Supplement Plan G High Deductible: Lower Premiums Explained

Most people come to me already confused, usually after a friend told them High Deductible Plan G is “basically free” and they want to know if that’s actually true. It’s not quite that simple. But here’s what IS true: for the right person, HDG (that’s the shorthand for Medicare Supplement High Deductible Plan G) is genuinely one of the most underrated options on the market right now, and most insurance agents don’t push it because their commission on it is smaller. I’m not going to pretend I don’t notice that.

Let me back up. Medicare Supplement plans, also called Medigap plans, fill the gaps that Original Medicare (Parts A and B) leaves behind: copays, coinsurance, the Part A deductible, and so on. Standard Plan G covers nearly all of those gaps dollar-for-dollar once you’re enrolled. High Deductible Plan G covers the exact same things, with one critical difference: you pay out-of-pocket until you hit a deductible threshold, after which the plan kicks in and covers everything that standard Plan G would. As of 2026, that deductible is $2,870. After that point, your coverage is identical to regular Plan G.

What You’re Actually Paying (and What You’re Not)

Here’s where I want to be honest with you, because this is where people get tripped up. The appeal of HDG is the low premium. I’ve seen quotes for a 65-year-old woman in good health come in around $43 a month in states like Indiana and Missouri, compared to $165 or more for standard Plan G in the same zip code. That’s a difference of about $1,464 a year in premium savings.

But you’re also taking on up to $2,870 in potential out-of-pocket costs if you have a bad year. The math question everyone should ask: “How many years of premium savings does it take to cover a worst-case deductible year?” With a $1,464 annual savings, the answer is roughly two years. If you stay healthy for two years running, you’re ahead. If you hit the deductible both years, you’re basically even with what you’d have paid in standard Plan G premiums.

What most people don’t realize is that hitting the full $2,870 deductible requires a pretty significant medical event. Medicare pays 80% of approved Part B charges; you owe 20% coinsurance plus your separate Part B deductible ($257 in 2026). To run up $2,870 in your share of costs in a single year, you’d typically need hospitalization, outpatient surgery, or a stretch of frequent specialist visits. For someone who sees their primary care doc twice a year and takes a generic blood pressure pill, the realistic out-of-pocket is often under $400 annually.

Premiums above are broad national ranges based on insurer filings reviewed as of August 2026. Your actual quote will depend on your state, age, tobacco use, and the specific insurer.

Who This Plan Is Actually For

Helpful resource: Medicare and You 2024 Official Handbook (Amazon) is a top-rated option for this. (As an Amazon Associate this site earns from qualifying purchases.)

I’ll be direct here: HDG is not for everyone, and I’ve seen people pushed into it when they shouldn’t have been.

It works beautifully for someone who is 65 to 68, in good health, has an emergency fund of at least $3,000 (so a bad year doesn’t wreck them financially), and wants to keep monthly costs low. It’s also smart for people who have other assets they’re managing and view the premium savings as money they’d rather invest than hand to an insurance company each month.

It’s a harder sell for someone with a chronic condition requiring regular specialist visits, someone who finds the unpredictability of medical bills genuinely stressful, or anyone who doesn’t have liquid savings to cover a high-cost year. Stress has real health costs. If worrying about a potential $2,870 bill keeps you from going to the doctor when you should, the “savings” evaporate.

One scenario I’ve seen play out well: a reader, Carol from Tucson, enrolled in HDG at 65 and kept her premiums around $52 a month for her first three years. She had one minor outpatient procedure in year two that cost her about $800 out-of-pocket. Over three years, she paid roughly $1,872 in premiums and $800 in out-of-pocket costs, totaling about $2,672. A comparable standard Plan G policy over the same period would have cost her an estimated $5,400 in premiums alone, with virtually nothing additional out-of-pocket. She came out well ahead.

That said, her situation: healthy, financially stable, comfortable with some risk. If you’re not Carol, the math might flip.

The Enrollment Trap Nobody Warns You About

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This is the part where I’d lean across the table and make sure you’re paying attention. When you first enroll in Medicare Part B, you have a six-month Medigap Open Enrollment window. During that window, any insurance company offering Medigap plans in your state must sell you any plan they offer at standard rates, regardless of your health history. No medical underwriting. No rejections.

Once that window closes, most states allow insurers to medically underwrite you. Which means if you developed diabetes, heart disease, COPD, or a handful of other conditions, you can be denied or charged significantly more. A few states (California, Connecticut, Maine, Massachusetts, New York, and a couple of others) have guaranteed issue rights year-round or on anniversary dates, so check Medicare.gov for your state’s rules.

I made the mistake years ago of assuming a client could always “try” HDG and switch later if her health changed. She could not. By the time she wanted to move to standard Plan G, she had a new diagnosis that got her rejected by every carrier in her state (which was not one of the protected ones). She’s still on HDG, managing fine financially, but it wasn’t the choice she’d have made if she’d fully understood the rules up front.

The practical upshot: choose your initial Medigap plan thoughtfully, because switching later may not be an option.

How HDG Works With Your Medicare Bills Day-to-Day

In practice, here’s how it flows. You go to a doctor who accepts Medicare. Medicare processes the claim and pays its share (generally 80% of the approved amount for Part B services). The remaining 20% coinsurance, plus the Part B deductible if you haven’t met it yet, gets billed to your HDG plan. Your insurer tracks your cumulative out-of-pocket costs against the $2,870 deductible. Until you hit that number, you’re paying those costs yourself, usually billed directly from your provider or reimbursed to them by the insurer after your share clears.

Once you cross $2,870 for the year, the plan pays 100% of Medicare-approved amounts for the rest of the calendar year. On January 1, the counter resets.

One detail that surprises people: foreign travel emergency coverage is not included in HDG (it’s also not in standard Plan G, actually, so you’d want a Plan G with the optional travel rider, or a Plan D or N if international coverage matters to you). If you travel abroad frequently, factor that in.

The Centers for Medicare & Medicaid Services publishes updated benefit charts annually, and I’d recommend bookmarking that resource if you want to verify any figures as they change year to year.

Comparing Carriers: Don’t Assume They’re All the Same

Benefits for standardized Medigap plans are set by federal law, so the actual coverage of HDG is identical no matter which insurer you buy from. But premiums vary dramatically between carriers for the same person in the same zip code, and the company’s financial stability and claims-paying history actually matters.

I’d look at A.M. Best ratings (you want at least an A- rating) and check how long the carrier has been offering Medigap specifically. Some of the biggest names in HDG currently include Mutual of Omaha, Aetna, and Cigna, though regional carriers sometimes beat them on price. A licensed Medicare broker who works with multiple carriers (not a captive agent for one company) can pull comparative quotes for your area in about ten minutes. There’s no cost to you for a broker’s help; they’re compensated by the insurer if you enroll.

One thing I check for personally when evaluating a carrier: how often they’ve raised HDG premiums in the past five years. Some insurers use low initial premiums to get you in the door, then raise rates sharply in years two and three. Ask for rate increase history. Any decent agent should be able to pull that data.

Sources

• Medicare.gov: Official Medicare plan comparison, Medigap rules by state, and enrollment period information
• Centers for Medicare & Medicaid Services (CMS): 2026 Medigap benefit standardization charts and annual deductible figures
• Medicare & You 2026 Handbook: CMS’s official annual handbook covering supplement plan details
• A.M. Best Company: Financial strength ratings for insurance carriers (used to evaluate insurer stability)
• Kaiser Family Foundation (KFF): Research on Medigap enrollment trends and cost-sharing analysis

Photo: Nicola Barts via Pexels

This article is for informational purposes only. Medicare rules change annually. Always verify current plan details at Medicare.gov or by calling 1-800-MEDICARE (1-800-633-4227). This site does not sell insurance or recommend specific plans.

Recommended Resources

Disclosure: As an Amazon Associate, we earn a small commission from qualifying purchases at no extra cost to you. We only recommend products that genuinely support the topics covered in this article.

• Medicare For Dummies (~$22), The definitive consumer guide to Medicare, enrollment windows, Part A/B/C/D, and supplement plans.
• Get What’s Yours for Medicare (~$17), Maximize your Medicare benefits and minimize out-of-pocket costs. Covers Part D drug coverage gaps and Medigap in depth.