Medicare Supplement Covers More Than You Think — But It Has Real Blind Spots
Medigap is genuinely excellent insurance. I’ll say that upfront, because I don’t want to bury the lead with a list of problems before you understand the context. For most people, a Plan G or Plan N handles the overwhelming majority of what Medicare leaves unpaid — hospital cost-sharing, doctor visit coinsurance, foreign travel emergencies, and more. But there are specific expenses it won’t touch. And those gaps trip people up constantly, especially in the first year after enrolling.
So here’s the honest answer: Medicare Supplement does not cover prescription drugs, dental care, vision care, hearing aids, long-term custodial care, or routine foot care. It also won’t pay the Part B deductible if you’re on Plan N or Plan G (Plan G covers everything else; Plan N has copays). That’s the short list. The details matter more than the categories, so let’s get into them.
The Big Four: Prescriptions, Dental, Vision, and Hearing
These four categories account for most of the “wait, Medigap doesn’t cover that?” moments I hear about. They’re excluded because Medigap is specifically designed to fill the gaps inside original Medicare — Parts A and B. Medicare itself doesn’t cover these things as a general rule, so there’s nothing for Medigap to supplement.
Prescription drugs are the most financially significant of the four. If you skip Part D coverage because you think your Medigap plan has you covered, you’re going to have a problem. I’ve talked to people who went 18 months without a Part D plan because they assumed the supplement “handled everything.” It doesn’t. You need a standalone Part D plan on top of your Medigap policy. They’re sold separately and priced separately.
Dental is the one that consistently shocks people. A crown can run $1,200 to $2,000 out of pocket. Implants are often $3,000 or more per tooth. Original Medicare doesn’t cover routine cleanings, fillings, extractions, or periodontal work — and since Medigap only fills Medicare’s gaps, it doesn’t either. If you have significant dental needs, you need a standalone dental plan or a Medicare Advantage plan that includes dental benefits. That said, Medicare Advantage comes with tradeoffs, so don’t jump ship from Medigap just for dental coverage without thinking it through.
Vision and hearing are similar. Routine eye exams, glasses, contact lenses, and hearing aids are all excluded from original Medicare and therefore from Medigap. Medicare does cover certain medically necessary eye care — like treatment for glaucoma or cataracts — but your annual eye exam and your $4,000 hearing aids? That’s on you. Standalone vision and hearing plans exist, and they’re usually affordable ($20-$50/month range), so don’t ignore them just because they seem like a hassle to set up.
Long-Term Care: The Gap Most People Underestimate
This one deserves its own section because the financial stakes are so much higher. Medigap does cover skilled nursing facility coinsurance — that’s the cost-sharing for days 21 through 100 in a skilled nursing facility after a qualifying hospital stay. Plan G covers that in full. But that’s not the same as long-term custodial care, which is what most people actually end up needing.
Custodial care means help with activities of daily living: bathing, dressing, eating, using the bathroom. It’s what happens when you’re not “sick” enough for skilled nursing but not independent enough to live without assistance. A private room in a nursing home averaged over $100,000 per year nationally in recent years. Medicare pays none of it. Medigap pays none of it. Medicaid pays it only after you’ve spent down most of your assets.
Long-term care insurance exists specifically for this. It’s expensive and harder to qualify for once you’re already in your 70s, which is why I tell anyone who’s still in their early 60s and reading this: don’t wait. If you’re 68 or older and in decent health, hybrid life/LTC policies are worth looking at as an alternative. This is a genuine planning issue, not just an insurance gap.
The Common Mistake: Thinking Plan G Covers Everything
In my experience, this is the #1 misconception among people who’ve recently enrolled in Medigap. They buy Plan G, they feel like they’re fully protected, and then they get blindsided. Plan G is the best all-around Medigap plan available to most people, and I’d recommend it to a 65-year-old in most states without hesitation. But “best available” isn’t the same as “covers everything.”
Here’s what Plan G actually covers versus what it doesn’t:
| Expense Type | Does Plan G Cover It? | Notes |
|---|---|---|
| Part A hospital coinsurance | Yes | Days 61-90 and beyond |
| Part B coinsurance (20%) | Yes | For Medicare-approved services |
| Part A deductible | Yes | 2026 amount: $1,676 per benefit period |
| Part B deductible | No | 2026 amount: $257 per year — you pay this |
| Skilled nursing facility coinsurance | Yes | Days 21-100 after qualifying stay |
| Prescription drugs | No | Need separate Part D plan |
| Dental care | No | Standalone dental plan needed |
| Vision/Hearing | No | Separate coverage needed |
| Long-term custodial care | No | Not covered by Medicare at all |
| Foreign travel emergencies | Yes (80%) | After $250 deductible; $50,000 lifetime limit |
The Part B deductible is a small thing — $257 in 2026 — but it surprises people who assumed Plan G was truly “gap-free.” It’s the one cost-sharing item Plan G doesn’t pick up. If that bothers you, Plan F eliminates it, but Plan F is only available to people who were eligible for Medicare before January 1, 2020. For most people enrolling today, Plan G is still the right call; $257 a year shouldn’t change your decision.
Other Expenses Medicare Supplement Won’t Cover
Beyond the big categories, there are some smaller but genuinely annoying exclusions worth knowing about.
Routine foot care is excluded unless there’s a medical condition — like diabetes with peripheral neuropathy — that makes it medically necessary. If you just want your toenails trimmed by a podiatrist, Medicare won’t pay for it and neither will Medigap.
Cosmetic surgery is excluded unless it’s reconstructive after an injury or illness. That’s a standard exclusion across basically every health insurance product, so it shouldn’t surprise anyone.
Services not approved by Medicare are a bigger deal than people realize. Medigap only covers cost-sharing for services Medicare has already agreed to pay its portion on. If a provider doesn’t accept Medicare assignment, or if Medicare denies a claim as not medically necessary, Medigap won’t step in. There’s a limited exception for “excess charges” in Plan G (it covers them, up to 15% above Medicare’s approved rate), but if Medicare denies the claim entirely, you’re on your own.
Acupuncture is a borderline case. Medicare does cover limited acupuncture for chronic low back pain now, and in those cases Plan G would cover the 20% coinsurance. But acupuncture for anything else? Not covered by Medicare, not covered by Medigap.
There’s also the question of private-duty nursing beyond what Medicare covers. If you need around-the-clock nursing care at home and Medicare’s home health benefit doesn’t cover the full scope of what you need, Medigap won’t fill that gap either. This circles back to the long-term care conversation.
Bottom Line
Plan G is still the right Medigap plan for most people enrolling at 65, and it genuinely covers the vast majority of out-of-pocket costs under original Medicare. But you need a separate Part D drug plan, you should strongly consider standalone dental and vision coverage, and if long-term care is a concern, address that independently with an LTC or hybrid policy. Don’t let the gaps listed here scare you away from Medigap — just go in with your eyes open.
Frequently Asked Questions
Does Medicare Supplement cover dental implants?
No. Neither original Medicare nor any Medigap plan covers dental implants, dentures, routine cleanings, or most other dental work. You’ll need a standalone dental plan for that. Some people opt for Medicare Advantage instead because certain plans include dental benefits, but weigh that decision carefully since Advantage plans restrict your provider network in ways Medigap doesn’t.
Will my Medigap plan cover prescriptions I take every day?
No. Medigap has not covered prescription drugs for plans sold after 2006. You need a standalone Part D Prescription Drug Plan to cover medications. If you skip Part D and try to enroll later, you’ll face a late enrollment penalty — a permanent premium surcharge — so don’t put it off thinking your Medigap handles it.
What happens if Medicare denies a claim — does Medigap still pay?
Generally no. Medigap covers cost-sharing for services Medicare approves. If Medicare denies a claim as not medically necessary, or the service simply isn’t covered by Medicare at all, your Medigap plan won’t pick up the tab. This is why it’s worth understanding what Medicare covers before assuming you’re protected against a specific expense.
Does Medicare Supplement cover hearing aids?
No. Hearing aids are specifically excluded from original Medicare coverage, so Medigap has nothing to supplement there. Hearing aids can cost $2,000 to $7,000 or more depending on technology level. You can buy a standalone hearing benefit plan, or look at over-the-counter hearing aids if your hearing loss is mild to moderate. It’s one of the most frustrating gaps in the entire Medicare system.
