Medigap Plan D: Eligibility, coverage, costs, and more

If Medicare terminology makes you feel like someone spilled alphabet soup onto your kitchen table, you are not alone. One of the most confusing examples is Medigap Plan D, which sounds suspiciously similar to Medicare Part D but is absolutely not the same thing. One helps fill coverage gaps in Original Medicare. The other helps pay for prescription drugs. Same letter, wildly different jobs.

That distinction matters because Medigap Plan D can be a strong option for people who want broader protection from out-of-pocket costs without paying for the most comprehensive supplement on the shelf. It covers major cost-sharing items like Part A deductible, skilled nursing facility coinsurance, and foreign travel emergency care up to plan limits. But it does not cover the Part B deductible, Part B excess charges, or prescription drugs.

So where does that leave Plan D in the real world? Think of it as a middle-ground Medigap plan: more protective than the bare-bones options, but not quite as padded as Plan G. For some people, that balance works beautifully. For others, the missing excess-charge coverage is a dealbreaker. Below, we break down Medigap Plan D eligibility, coverage, costs, shopping tips, and the kinds of experiences people often have when deciding whether this plan belongs in their Medicare lineup.

What is Medigap Plan D?

Medigap Plan D is a standardized Medicare Supplement Insurance plan sold by private insurers to people enrolled in Original Medicare, which means Medicare Part A and Part B. “Standardized” is the key word here. If two insurers in your state both sell Plan D, the core benefits are the same. One company cannot secretly slip in better hospital coverage while another hands you the bargain-bin version. The biggest difference is usually the price, plus any extra non-insurance perks the carrier tosses in.

Just as important: Medigap Plan D is not Medicare Part D. Plan D is supplemental medical coverage. Medicare Part D is separate prescription drug coverage. Since Medigap policies sold after 2005 do not include drug coverage, many people with Plan D also enroll in a stand-alone Part D drug plan for prescriptions.

Who is eligible for Medigap Plan D?

You must have Original Medicare

To buy Medigap Plan D, you generally need both Medicare Part A and Part B. If you are enrolled in a Medicare Advantage plan, you cannot use Medigap to cover that plan’s copays, deductibles, and premiums. Medigap works with Original Medicare, not as an add-on to Medicare Advantage.

Your enrollment timing matters a lot

The best time to buy Plan D is usually during your Medigap Open Enrollment Period. This is the six-month window that begins the first month you are both 65 or older and enrolled in Part B. During that period, insurers generally must sell you a Medigap policy available in your area and cannot charge more because of preexisting health conditions.

Miss that window, and things can get trickier. Depending on your state and situation, insurers may use medical underwriting, charge more, or deny your application unless you qualify for a guaranteed issue right. These rights can apply in certain situations, such as losing other qualifying coverage or leaving a Medicare Advantage plan under specific rules.

Can people new to Medicare buy Plan D?

Yes. In fact, Plan D remains available to people who became newly eligible for Medicare on or after January 1, 2020. That matters because Plans C and F are no longer available to newly eligible beneficiaries. If you were hoping for a fairly robust Medigap option without wandering into closed-plan territory, Plan D is still on the menu.

What if you are under 65?

This is where Medicare turns into a choose-your-own-adventure novel, except the adventure is insurance law. Federal rules do not always require insurers to sell Medigap to people under 65 who qualify for Medicare because of disability, ESRD, or ALS. Some states do offer access, some offer limited access, and some offer stronger protections than federal law requires. In other words, under-65 eligibility for Medigap Plan D depends heavily on state rules.

Do all states use the same lettered plans?

Almost all do, but Massachusetts, Minnesota, and Wisconsin standardize Medigap policies differently. If you live in one of those states, you should not assume that “Plan D” will appear exactly the same way it does elsewhere.

What does Medigap Plan D cover?

Plan D covers a generous set of Medicare gaps, including:

• Part A coinsurance and hospital costs for up to an additional 365 days after Medicare benefits are used up
• Part B coinsurance or copayments
• Blood, including the first 3 pints
• Part A hospice care coinsurance or copayment
• Skilled nursing facility care coinsurance
• Part A deductible
• Foreign travel emergency coverage at 80% up to plan limits

That foreign travel benefit is one of Plan D’s underrated features. Original Medicare generally offers very limited coverage outside the United States, so having a Medigap plan that includes emergency foreign travel coverage can be reassuring if retirement has you pricing river cruises and impulsively saying things like, “We should see Lisbon in the spring.”

What Medigap Plan D does not cover

Plan D is solid, but it is not an all-you-can-bill buffet. Here is what it does not cover:

• Medicare Part B deductible
• Part B excess charges
• Prescription drugs
• Routine dental, vision, and hearing care
• Long-term care
• Private-duty nursing
• Services Medicare does not cover

The most important omission for many shoppers is Part B excess charges. These are additional amounts certain providers may bill above the Medicare-approved amount when they do not accept assignment. If your doctors all accept Medicare assignment, this gap may not matter much. If you regularly see specialists who do not, Plan D can leave you more exposed than Plan G.

And because Medigap Plan D does not include prescription drug coverage, you may also want a stand-alone Medicare Part D plan. That is especially important because waiting too long to enroll in drug coverage without other creditable prescription coverage can trigger a late enrollment penalty.

How much does Medigap Plan D cost?

There is no single national premium for Medigap Plan D. Costs vary by:

• State and ZIP code
• Insurance company
• Age
• Tobacco use
• Gender in some markets
• Household or enrollment discounts
• Whether pricing is community-rated, issue-age-rated, or attained-age-rated
• Whether you apply during open enrollment or later with underwriting

The pricing method matters more than many people realize. A policy that looks affordable at age 65 may become pricier over time if it is attained-age-rated, meaning premiums rise as you get older. An issue-age-rated plan is based on the age you are when you buy it, while a community-rated plan generally charges the same premium regardless of age. That is why comparing only today’s premium can be a little like shopping for a used car based only on how shiny the hood looks.

Published market examples show just how wide the range can be. For instance, quote data highlighted by NerdWallet showed monthly Plan D premiums in the Atlanta metro area ranging from about $158 to $386 for a 65-year-old female nonsmoker. That is not a national average, but it is a useful reminder that identical Plan D coverage can come with very different monthly premiums depending on the carrier.

For broader context, KFF reported that the average monthly premium among all current Medigap policyholders was $217 in 2023. That figure is not specific to Plan D, but it helps set expectations: Medigap is often a meaningful monthly expense, not spare-change sofa-cushion money.

You should also remember the costs that Plan D does not erase. In 2026, the standard Part B premium is $202.90 per month, and the Part B deductible is $283. Since Plan D does not cover that deductible, you still pay it before Original Medicare begins paying its share for many Part B services. If you also add a stand-alone drug plan, that is a separate premium too.

Plan D vs. Plan G: what is the real difference?

This is one of the most common Medigap shopping questions, and for good reason. Plan D and Plan G are very similar, but Plan G covers one major thing that Plan D does not: Part B excess charges.

That means Plan G is often seen as the more protective option, especially for people who want fewer billing surprises. On the other hand, Plan D may have a lower premium, which can make it attractive if your providers accept Medicare assignment and you are comfortable handling the occasional uncovered charge yourself.

A simple way to think about it: Plan G buys more peace of mind; Plan D may buy more breathing room in your monthly budget. Which one is better depends less on internet debates and more on your doctors, travel habits, risk tolerance, and premium quotes in your area.

Who should consider Medigap Plan D?

Plan D may be a good fit if you:

• Want broader protection than lower-tier Medigap plans
• Prefer Original Medicare over Medicare Advantage
• Like the idea of foreign travel emergency coverage
• Want coverage for the Part A deductible and skilled nursing coinsurance
• Are trying to save money compared with Plan G, but still want fairly robust benefits
• Mainly see providers who accept Medicare assignment

It may be less appealing if you want the most predictable out-of-pocket experience possible or you regularly use providers who could bill Part B excess charges.

How to shop smart for Medigap Plan D

If you are comparing carriers, focus on more than the headline premium. A smart shopping checklist includes:

1. Confirm the pricing method so you understand how the premium may change over time.
2. Compare the same lettered plan across multiple insurers, since benefits are standardized.
3. Ask about discounts, such as household, non-smoker, annual-pay, or autopay discounts.
4. Check rate history and customer service reputation, not just the teaser quote.
5. Review your doctors’ billing habits, especially whether they accept Medicare assignment.
6. Price a separate Part D drug plan if you need prescription coverage.

If your state offers counseling through a SHIP program, that can be a very useful place to get free, unbiased help. It is especially helpful when you are deciding between Medigap and Medicare Advantage, or when guaranteed issue rights might apply.

Real-world experiences with Medigap Plan D

The scenarios below are illustrative composites based on common Medicare decision patterns, not individual testimonials.

One common experience is the “I want predictable hospital coverage, but I do not want to overbuy” shopper. Think of a newly retired 66-year-old who likes Original Medicare because it works broadly nationwide and does not require building life around a managed care network. This person looks at Plan G, likes it, then sees the premium and pauses. Plan D starts to look attractive because it still covers major items like the Part A deductible, skilled nursing facility coinsurance, and foreign travel emergency care. For someone whose doctors accept Medicare assignment, the missing excess-charge coverage may feel like a manageable tradeoff.

Another familiar experience is the traveler’s angle. Plenty of retirees do not live like they are “slowing down.” They visit grandkids in another state, take road trips, or finally book the overseas trip they postponed for years. These shoppers often appreciate that Plan D includes foreign travel emergency coverage up to plan limits. It is not full global health insurance, and it should not be treated like it is, but it can make occasional international travel feel less financially scary. For people who plan to spend long stretches abroad, though, Plan D may still need backup travel coverage.

Then there is the budget-pressure experience. Some beneficiaries discover that Medicare is not exactly cheap once you stack premiums together: Part B premium, Medigap premium, maybe a Part D premium, plus the usual non-covered extras like dental and vision. In those cases, Plan D sometimes lands in a sweet spot. It offers more protection than the skimpier options without climbing to the top of the premium ladder. The downside, of course, is that these same budget-conscious enrollees may be more sensitive to surprise bills, which is why checking provider assignment habits becomes so important.

A fourth real-world pattern is confusion. Lots of people hear “Plan D” and assume it must include prescriptions. Then they discover, usually after some quality time with Medicare paperwork and a strong cup of coffee, that Medigap Plan D and Medicare Part D are separate products. This misunderstanding is incredibly common, and it can lead to delays in enrolling in drug coverage. That is why a good shopping experience for Plan D should always include a second question: Do I also need a separate prescription drug plan?

Finally, people who apply outside their open enrollment window often have the most frustrating experience. They may find a Plan D premium online that looks reasonable, only to learn that underwriting, health history, or state rules change the outcome. That does not mean Plan D is a bad option. It just means timing can be everything in the Medigap world. The best experience usually belongs to the shopper who compares early, understands the enrollment window, and chooses based on both today’s premium and tomorrow’s likely costs.

Final thoughts

Medigap Plan D is a legitimate contender for Medicare beneficiaries who want strong supplemental coverage without automatically jumping to the most popular plan. It helps pay for many of the most important out-of-pocket gaps in Original Medicare, including hospital cost-sharing, skilled nursing coinsurance, and certain foreign travel emergencies. At the same time, it leaves you responsible for the Part B deductible, Part B excess charges, and prescription drug coverage.

That makes Plan D neither a bargain-bin backup nor a luxury upgrade. It is more like a carefully packed suitcase: it carries a lot of what you need, but you still have to decide whether the missing items are small inconveniences or big problems. If you value Original Medicare flexibility, want meaningful gap coverage, and can find a competitive premium, Plan D may be worth a very close look.