The Real Difference Between High and Low Deductible Medigap
Most people picking a Medigap plan get this wrong: they focus on the monthly premium and stop there. That’s a mistake that can cost you thousands of dollars over a few years, sometimes in the wrong direction.
Here’s the basic setup. A standard Plan G (the most popular Medigap plan in 2026) covers nearly everything Medicare doesn’t, starting from dollar one after you’ve paid the 2026 Part B deductible of $257. You pay a monthly premium, typically somewhere between $100 and $200 at age 65 depending on your state and insurer, and in exchange you get predictable costs. A bad health year doesn’t wreck your budget.
High Deductible Plan G works differently. The premium drops significantly, often to $40-$70 per month at age 65. But before the plan kicks in and starts covering your out-of-pocket costs, you have to meet a deductible. In 2026, that deductible is $2,870. Until you hit that threshold, you’re paying for Medicare cost-sharing yourself.
So you’re essentially choosing between paying more every month for certainty, or paying less every month and absorbing costs if you get sick. Neither choice is automatically right. But for most healthy retirees who are disciplined savers, I’ll tell you upfront: high deductible is underused and underappreciated.
How the Numbers Actually Play Out Year to Year
Let’s put real math on this. Take a 67-year-old woman in Ohio. She’s comparing standard Plan G at $140/month versus High Deductible Plan G at $55/month. That’s a $85/month difference, or $1,020 per year in savings on premiums alone.
In a healthy year where she sees her primary care doctor three or four times and gets a couple of routine labs, her out-of-pocket Medicare cost-sharing might total $400 to $600. She never gets close to the $2,870 deductible. With the high deductible plan, she’s ahead by $400 to $600 that year after factoring in her lower premiums.
Now say she has a rough year. A hospital admission, some specialist visits, maybe a minor procedure. She hits the full $2,870 deductible. On standard Plan G, those same costs would’ve been covered from dollar one (after the Part B deductible). So on paper she’s “behind” by $2,870 minus her premium savings. In year one, that gap is real. But if she’s been banking $85 per month, she’s built a cushion that covers it within three years of premium savings.
This is the math that matters. Here’s a side-by-side for context:
| Scenario | Standard Plan G (est. $140/mo) | High Deductible Plan G (est. $55/mo) |
|---|---|---|
| Annual premium cost | $1,680 | $660 |
| Healthy year out-of-pocket | $257 (Part B deductible) | $257 to $800 |
| Bad year out-of-pocket | $257 | Up to $2,870 |
| Total cost, healthy year | $1,937 | $917 to $1,460 |
| Total cost, bad year | $1,937 | $3,530 |
The standard plan’s total cost barely changes year to year. That’s the point of it. The high deductible plan saves you money in most years but hits harder in a bad year. Whether that tradeoff makes sense depends on your health, your savings, and your temperament.
Who Should Choose Each Option (And I Mean Specifically)
I’ve talked to a lot of people about this over the years, and the clearest way I can put it is this: high deductible plans are for people who are genuinely healthy and have a financial cushion. Standard plans are for people who want to sleep at night without thinking about medical bills.
High Deductible Plan G makes sense if you:
- Are in good health at enrollment with no major chronic conditions requiring frequent specialist care
- Have at least $5,000 to $10,000 in accessible savings you could tap in a bad year without panic
- Are comfortable with some year-to-year variability in your healthcare spending
- Plan to stay on this plan for several years, giving the cumulative premium savings time to build up
- Are budget-conscious and would rather have lower fixed monthly expenses
Standard Plan G (or Plan N if you want a middle-ground option) makes more sense if you:
- Have ongoing health issues that mean regular doctor visits, prescriptions that require monitoring, or any condition that lands you in the hospital periodically
- Are on a tight fixed income where a $2,870 unexpected bill would be genuinely disruptive
- Have significant anxiety about medical costs and want a plan that makes those predictable
- Are enrolling at 70 or older, when the odds of a bad health year are higher
One thing I want to say directly: if you’re 65 and healthy and your main concern is keeping your monthly expenses low during the early years of retirement, high deductible is often the smarter financial move. Most 65-year-olds don’t have a catastrophic health year right out of the gate.
The Mistake I See People Make All the Time
Here it is. People hear “high deductible” and immediately think it means low-quality coverage. It doesn’t. High Deductible Plan G covers exactly the same things as standard Plan G. The benefits are identical. The only difference is when they kick in.
I’ve seen people pay $150/month for standard Plan G for 10 years, spend maybe $300-$500 out of pocket most years, and never once hit anything close to the catastrophic costs they were afraid of. Over a decade, they paid $18,000 in premiums. Someone on High Deductible Plan G paying $60/month would have paid $7,200 in premiums over the same period. Even if that person had two genuinely bad years and hit the full deductible both times, they’d have spent $7,200 + $5,740 = $12,940. Still less.
The fear isn’t irrational. Nobody wants to be sick and broke. But the math over a 10-year window typically favors high deductible for healthy enrollees, and most people don’t run that math before deciding.
The other misconception worth addressing: some people think you can switch freely between plans later. You generally can’t without underwriting, at least not in most states. Once you’re past your open enrollment period, switching from standard to high deductible might require medical underwriting, and if your health has changed, you could be denied or charged more. This is exactly why the decision you make at 65 matters so much.
A Few Things That Tip the Scales
Your state matters more than people realize. Some states, like Massachusetts, Minnesota, and Wisconsin, have standardized Medigap differently, so the high/low deductible comparison works differently there. If you’re in one of those states, get state-specific guidance before assuming what I’ve described here applies to you.
Your age at enrollment also shifts the calculation. A 65-year-old choosing high deductible has time on their side. Premium savings compound over years, and statistically, they’re less likely to face major health events in the near term. A 72-year-old making this decision for the first time is in a different situation. The window to accumulate savings is shorter, and the risk of needing that deductible sooner is higher. I’d lean toward standard Plan G in that case.
Also worth knowing: the 2026 Part A deductible is $1,676 per benefit period, not per year. That’s a significant cost-sharing exposure if you’re hospitalized, and it counts toward your high deductible plan’s deductible. So a hospital admission gets you partway there fast. For people who’ve been hospitalized recently or have conditions that make it likely, that context matters.
One more thing. Some insurers let you pair a high deductible Medigap plan with a Medicare Savings Account, though these are rare and come with their own rules. It’s worth asking your insurance agent if that’s available in your state, because it can make the high deductible option even more attractive from a tax standpoint.
Bottom Line
If you’re 65, in decent health, and have some savings to cover a bad year, High Deductible Plan G is genuinely worth serious consideration. Most people dismiss it without running the numbers, and that’s a costly reflex. That said, if unpredictable medical bills would cause you real financial or emotional stress, the peace of mind from standard Plan G has real value too, and there’s no shame in paying for that.
Frequently Asked Questions
Can I switch from High Deductible Plan G to standard Plan G later?
In most states, switching after your Medigap open enrollment period requires medical underwriting. That means if your health has changed, an insurer can decline you or charge more. A few states have additional protections, but don’t count on being able to switch freely. Make this decision carefully upfront.
Does the high deductible apply to Part A and Part B separately?
No. The $2,870 deductible (2026) for High Deductible Plan G is a combined threshold. All Medicare-approved cost-sharing you pay counts toward it, whether it’s from Part A (hospital) or Part B (outpatient). Once you hit the combined total, the plan covers everything Plan G normally covers for the rest of the year.
Are there situations where neither Plan G option is the right call?
Yes. Plan N is worth a look if you want something between the two. It has lower premiums than standard Plan G but doesn’t have the full deductible of High Deductible Plan G. You pay up to $20 per office visit and up to $50 for emergency room visits that don’t lead to inpatient admission. For people who rarely see specialists, it can be a good middle path.
What if I have a chronic condition but still want to save money on premiums?
This is where you need to be honest with yourself about your annual healthcare usage. If your condition means you’re regularly seeing specialists, getting imaging, or have any history of hospitalizations, you’re likely to hit or approach the high deductible in many years. In that case, standard Plan G or Plan N will almost certainly save you money over time. The math just works differently when your out-of-pocket costs are consistently high.
