Medigap Plan G vs. High-Deductible Plan G: Which One Actually Costs Less?

Medigap Plan G is often chosen for predictability. Pay a higher monthly premium, meet the Medicare Part B deductible, and the policy covers most remaining Medicare-approved cost sharing. High-Deductible Plan G takes the opposite approach: much lower monthly premiums in exchange for paying substantially more out of pocket before the supplement begins paying.

The surprising part is that High-Deductible Plan G can sometimes cost less even in a year with meaningful medical care. But the math is only one part of the decision. The bigger question is how much financial uncertainty someone wants to absorb—and whether they can easily switch to richer coverage later if their health changes.

The Two Plans Cover the Same Gaps—Eventually

Standard Plan G and High-Deductible Plan G are both standardized Medigap policies used alongside Original Medicare. With Original Medicare, beneficiaries can generally see any doctor or hospital in the U.S. that accepts Medicare, and prior authorization is generally not required for most covered services. Medigap then helps pay the portions of Medicare-approved expenses that Original Medicare leaves behind.

Standard Plan G covers most of those gaps once the annual Part B deductible has been satisfied. That deductible is $283 in 2026. Plan G also covers the Part A hospital deductible, Part B coinsurance, skilled nursing facility coinsurance and Part B excess charges, among other standardized benefits.

High-Deductible Plan G ultimately provides the same standardized Plan G benefits, but only after the beneficiary pays a much larger amount toward Medicare-covered costs. CMS set that deductible at $2,950 for 2026. Until that threshold is reached, the beneficiary is responsible for Medicare deductibles, coinsurance and copayments that count toward it.

The Premium Difference Can Be Significant

The attraction of High-Deductible Plan G is straightforward: premiums can be substantially lower. Exact pricing varies by age, location, insurer and rating method, so there is no reliable national premium that applies to everyone. Medicare notes that standardized Medigap benefits are generally the same within a plan letter, while premiums can vary considerably among insurers.

Consider someone choosing between a standard Plan G costing $200 a month and a High-Deductible Plan G costing $65. The standard policy would cost $2,400 annually in premiums, while the high-deductible policy would cost $780. That is a difference of $1,620 before either person uses any medical care.

In a very healthy year, the high-deductible option can therefore produce substantial savings. If the beneficiary uses little more than routine Medicare-covered care and never comes close to the $2,950 threshold, much of the premium difference remains in their pocket.

A Bad Medical Year Doesn’t Automatically Make High-Deductible G More Expensive

The calculation becomes more interesting when health care usage rises. With High-Deductible Plan G, the beneficiary could potentially pay up to $2,950 in qualifying Medicare-covered out-of-pocket expenses before the supplement begins paying, plus the policy premiums.

Using the earlier example, $780 in annual premiums plus the full $2,950 deductible produces a maximum combined figure of about $3,730 before considering expenses not covered by Medicare or the supplement. Standard Plan G at $200 per month would cost $2,400 in premiums plus the $283 Part B deductible, or roughly $2,683 under that simplified comparison.

In that severe-use scenario, standard Plan G would cost about $1,000 less. But if the beneficiary’s actual cost sharing under High-Deductible G reaches only $800 or $1,000 during the year, the lower premium can still make the high-deductible version cheaper overall.

That is why the comparison should be based on annual total cost, not just the deductible.

Standard Plan G Buys Predictability

The strongest argument for standard Plan G is not necessarily that it always costs less. It is that the spending is much easier to predict.

Once the $283 Part B deductible has been satisfied in 2026, most Medicare-approved gaps covered by Plan G are handled by the supplement. A beneficiary facing a hospitalization, repeated specialist visits or expensive outpatient treatment does not suddenly have to find thousands of additional dollars to satisfy a separate Medigap deductible.

For some retirees, that predictability is worth paying for every month. Someone living on a fixed income may prefer a $200 premium that is easy to budget over a $65 premium accompanied by the possibility of several thousand dollars in additional expenses during a bad health year.

That is insurance in its most basic form: paying more consistently to reduce the size of an unexpected bill.

High-Deductible G Rewards People Who Can Self-Insure

High-Deductible Plan G tends to make more sense for someone with enough liquid savings to comfortably absorb the deductible. If a $2,950 medical expense would create financial stress, the lower premium may not provide much peace of mind.

Someone with substantial cash reserves may view the choice differently. Instead of paying an extra $100 or $150 every month regardless of health-care usage, that person can retain the savings and accept the possibility of paying more in a high-use year.

Over several healthy years, those premium savings can accumulate. A $125 monthly difference equals $1,500 annually and $15,000 over 10 years before accounting for premium increases or investment returns.

The financial question is whether enough of those savings remain after periods of heavier medical use.

Behavior Matters More Than the Spreadsheet

There is also a behavioral issue that cannot be ignored. A person with a high deductible knows that additional doctor visits or testing may come directly out of pocket until the deductible is satisfied. Even someone who can technically afford the bill may hesitate before scheduling care.

That can become a problem if cost concerns cause someone to postpone medically necessary treatment. A high-deductible policy works best when the beneficiary treats the deductible as money already reserved for health care rather than as an expense to avoid at all costs.

One practical strategy is to keep the deductible amount in a dedicated cash reserve. If the money is already set aside, going to the doctor does not feel like an unexpected hit to the monthly budget.

The best high-deductible plan is not useful if its structure discourages someone from obtaining needed care.

Don’t Assume You Can Upgrade Later

This may be the most important consideration in the entire comparison.

Medigap policies are guaranteed renewable once issued as long as premiums are paid, subject to limited exceptions such as fraud or an insurer leaving the market. That means someone who develops serious health problems can generally keep the High-Deductible Plan G already owned.

Moving from High-Deductible Plan G to standard Plan G is different. Outside a federally protected enrollment or guaranteed-issue period, insurers in many states can use medical underwriting. Depending on state law and the insurer, an applicant with new health problems could face a higher premium or be denied the new policy altogether.

There is no universal federal rule requiring a fixed number such as “40 health questions,” nor is there a national six-month point after which every switch requires underwriting. The rules depend on federal protections, state law and the circumstances of the switch.

The practical lesson is still important: do not select High-Deductible G assuming standard Plan G will automatically remain available later.

State Birthday Rules Can Help—But They Have Limits

Some states provide additional opportunities to switch Medigap policies without medical underwriting. These so-called birthday rules typically allow beneficiaries to change coverage around their birthday, although the allowed timing and permitted moves vary by state.

Many of these protections are designed to let beneficiaries move to a plan with equal or lesser benefits rather than use a birthday window to upgrade to substantially richer coverage. Other states provide broader continuous or annual guaranteed-issue protections.

That makes state law an important part of the Plan G decision. Someone living in a state with strong Medigap switching protections may have more flexibility than a retiree living somewhere insurers can routinely medically underwrite later applications.

Before choosing High-Deductible G with the intention of switching someday, beneficiaries should check their own state’s rules rather than relying on advice that may apply somewhere else.

Premium Increases Matter Over Decades

The comparison also changes over time because Medigap premiums do not remain fixed. Standard Plan G may cost significantly more at 75 or 80 than it did when someone first enrolled at 65.

High-Deductible Plan G premiums can rise as well, but the lower starting premium can make percentage increases less painful in dollar terms. Someone deciding between the two policies should therefore consider not only the first-year difference but also how paying the higher standard Plan G premium might affect the retirement budget over 20 or 30 years.

That does not automatically make High-Deductible G the better long-term value. Increasing health-care usage with age can make the larger deductible relevant more frequently.

The trade-off becomes a race between cumulative premium savings and cumulative out-of-pocket spending.

The HSA Can Help Cover the Risk

People entering Medicare with substantial Health Savings Account balances may have another source available for medical expenses. Once someone is enrolled in Medicare, new HSA contributions generally must stop, but existing HSA money does not disappear.

HSA funds can continue to be used tax-free for qualified medical expenses, including many Medicare-related costs. That can make the high-deductible strategy more comfortable for someone who already accumulated a large HSA balance during working years.

The presence of an HSA does not automatically make High-Deductible Plan G the better choice. But it can provide a dedicated pool of tax-advantaged money for the higher out-of-pocket costs that accompany the lower premium.

Run the Break-Even Number

The most useful way to compare the plans is to calculate the annual premium difference.

Suppose standard Plan G costs $210 a month and High-Deductible G costs $65. The annual premium difference is $1,740. That means the high-deductible policy begins every year with a $1,740 cost advantage.

If additional Medicare cost sharing under the high-deductible policy remains below $1,740, it wins financially for that year. If cost sharing rises substantially above that amount, standard Plan G begins looking more attractive.

The exact break-even point changes with the actual premiums available to the beneficiary. That is why broad statements that one plan is always cheaper are misleading.

This Is Really a Risk-Tolerance Decision

Standard Plan G is designed for someone willing to pay more every month to make health-care spending highly predictable. High-Deductible Plan G is designed for someone willing and able to absorb more cost personally in exchange for a substantially lower premium.

Neither is universally better.

A healthy retiree with significant savings, a large HSA and comfort with a $2,950 deductible may find High-Deductible G compelling. Someone who dislikes financial surprises or would worry about every specialist visit may find standard Plan G worth the additional premium even if it costs more over time.

The most important decision may be the one that cannot easily be reversed. Health can change much faster than Medigap eligibility rules, and the ability to move from the high-deductible version into standard Plan G later is not guaranteed everywhere.

So compare the premiums, calculate the break-even point and understand your state’s switching rules before enrolling.

High-Deductible Plan G can save real money. Just make sure you are comfortable keeping it if your health changes.