What Medigap Does Not Cover: Dental, Vision, Drugs & More

When you transition to Medicare, buying a Medicare Supplement (Medigap) policy is one of the most effective ways to protect your retirement savings from unpredictable medical bills. These policies are designed to step in and pay the deductibles, copayments, and coinsurance that Original Medicare leaves behind. However, a common and costly mistake new enrollees make is assuming these plans cover everything.

Understanding exactly what Medigap does not cover is essential for budgeting your healthcare costs. Because Medigap is strictly tied to Original Medicare (Part A and Part B), it only pays when Medicare approves a medical claim. If Medicare denies a service because it is considered routine or non-medical, your Medigap plan will automatically deny it, too.

In this guide, we will break down the strict boundaries of Medigap coverage for 2026 and 2027, explain why you need separate plans for dental, vision, and drugs, and show you how to avoid expensive enrollment penalties.

The Boundaries of Standardized Medigap Supplement Plans

To understand what a Medigap policy excludes, you first need to understand how it functions. Medigap is private health insurance designed specifically to fill the "gaps" in Original Medicare. It is not a standalone health plan; it is a secondary payer.

When you visit a doctor or hospital, the provider bills Medicare first. Medicare reviews the claim, pays its approved portion, and then forwards the remaining bill to your Medigap insurer. Your Medigap plan then pays its share based on the standardized letter plan you chose (such as Plan G or Plan N).

What Medigap Is Designed to Pay

Medigap excels at covering catastrophic medical expenses. For example, in 2026, the Medicare Part A hospital deductible is $1,736 per benefit period. If you have a Medigap plan that covers this deductible, you pay nothing out of pocket when you are admitted to the hospital. Medigap also covers the heavy coinsurance costs for long hospital stays, such as the $434 per day charge for hospital days 61 through 90 in 2026, and the $868 per day charge for lifetime reserve days.

However, this secondary-payer design means Medigap is permanently locked to Medicare's rules. If a service is not covered by Part A (hospital insurance) or Part B (medical insurance), your Medigap policy cannot and will not pay for it.

Exactly What Medigap Does Not Cover

Federal law strictly defines the benefits of standardized Medigap plans. Regardless of which insurance company sells you the policy, or which letter plan you choose, the exclusions remain identical. Here is the definitive list of what Medigap does not cover:

• Prescription Drugs: Any Medigap policy sold after 2006 strictly excludes prescription medication coverage.
• Routine Dental Care: Dental cleanings, oral exams, fillings, root canals, crowns, and dentures are entirely excluded.
• Routine Vision Care: Eye exams for the purpose of prescribing glasses, the eyeglasses themselves, and contact lenses are not covered.
• Hearing Aids: Routine hearing exams, hearing aid devices, and fittings are excluded.
• Long-Term Care: Custodial care in a nursing home, memory care facility, or assisted living facility is not covered.
• Private-Duty Nursing: Hiring a private nurse for in-home care is strictly excluded by both Medicare and Medigap.

Finding out about these exclusions at the pharmacy counter or the dentist's chair is a primary source of frustration for new Medicare beneficiaries. To avoid surprise bills, you must plan for these gaps before you need care.

Why Medigap Policies Never Cover Routine Dental, Vision, or Hearing

The exclusion of dental, vision, and hearing care is deeply rooted in how the federal government designed the Medicare program in 1965. Original Medicare was created to cover acute medical needs—surgeries, disease treatment, and hospitalizations. Routine maintenance for teeth, eyes, and ears was classified as personal health expenses, not medical necessities.

The Dental Coverage Gap

Because Medicare Part B does not cover routine dentistry, your Medigap plan will not pay for your bi-annual cleanings or a sudden need for a tooth extraction. There is a very narrow exception: if you require a dental procedure that is inextricably linked to a severe medical condition—such as a tooth extraction required before radiation treatment for jaw cancer—Medicare Part B may cover it as a medical necessity. In that rare scenario, Medigap would cover the 20% coinsurance. Otherwise, you are entirely responsible for the dentist's bill.

The Vision and Hearing Reality

The same logic applies to your eyes and ears. Medicare Part B covers medical treatments for eye diseases, such as cataract surgery, glaucoma screenings, or macular degeneration injections. If you have cataract surgery, Medicare pays 80%, and your Medigap plan pays the remaining 20%.

However, Medicare considers the natural aging of your vision and hearing to be routine. Therefore, eye exams for glasses and the purchase of hearing aids are completely excluded. With modern hearing aids often costing thousands of dollars, beneficiaries must seek standalone insurance, discount programs, or pay out of pocket.

The Standalone Prescription Drug Rule: Pairing Medigap with Part D

Perhaps the most critical exclusion to understand is prescription drugs. Prior to 2006, some older Medigap plans (like Plans H, I, and J) included basic drug coverage. However, when the federal government introduced Medicare Part D, the law changed. Today, it is illegal for an insurance company to sell a new Medigap policy that includes prescription drug coverage.

If you choose to enroll in Original Medicare and Medigap, you must purchase a separate, standalone Medicare Part D plan to cover your medications.

Part D Costs and Limits for 2026 and 2027

Part D plans are sold by private insurers and come with their own premiums, deductibles, and copays. For 2026, the maximum allowable Part D deductible is $615. The Centers for Medicare & Medicaid Services (CMS) has announced this maximum deductible will increase to $700 in 2027. You must pay this amount out of pocket before your drug plan begins to share the cost of your medications.

Fortunately, recent legislative changes have introduced strict caps on how much you can spend on covered drugs in a calendar year:

• 2026 Out-of-Pocket Cap: Your total out-of-pocket spending for covered Part D drugs is capped at $2,100.
• 2027 Out-of-Pocket Cap: CMS has announced this Part D out-of-pocket cap will index to $2,400.

Once you hit this cap, your Part D plan pays 100% of the cost for your covered formulary drugs for the rest of the year. Your Medigap plan is never involved in this process.

Upcoming Medicare Drug Price Negotiations

To further assist with costs that Medigap won't cover, Medicare has begun negotiating prices directly with drug manufacturers. CMS recently finalized lower prices for 15 high-cost Part D drugs—including Janumet for diabetes, Breo Ellipta for asthma/COPD, and Ibrance for breast cancer. These negotiated prices will take effect in 2027, saving enrollees an estimated $685 million out of pocket.

Avoiding the Part D Late Enrollment Penalty

Because Medigap does not cover drugs, you are responsible for securing your own creditable drug coverage. A dangerous mistake many healthy seniors make is delaying their Part D enrollment because they currently take no medications. They assume their Medigap plan is enough, or they decide to wait until they get sick to buy a drug plan.

Medicare severely penalizes this delay. If you go 63 days or more without creditable prescription drug coverage after your Initial Enrollment Period ends, you will be hit with the Part D late enrollment penalty.

How the Penalty is Calculated

The penalty is calculated as 1% of the "national base beneficiary premium" for every full month you were eligible for Part D but did not enroll.

For example, if you wait 24 months to sign up for a Part D plan, your penalty will be 24% of the national base premium. This penalty is not a one-time fee; it is added to your monthly Part D premium for the rest of your life. Even if you purchase a Medigap Plan G that covers 100% of your medical coinsurance, it will not protect you from this federal drug penalty. You must enroll in Part D on time.

The Reality of Long-Term Care and Private-Duty Nursing

Another major misconception is that Medigap will pay for a nursing home if you become frail or develop dementia. It is vital to differentiate between "skilled nursing" and "custodial care."

Skilled Nursing Facility (SNF) Care

Medicare Part A covers short-term care in a Skilled Nursing Facility, but only if you require daily skilled care (like physical therapy or intravenous injections) following a qualifying hospital stay of at least three days.

For 2026, Medicare pays 100% of the costs for the first 20 days in a SNF. For days 21 through 100, Medicare charges a strict coinsurance of $217 per day. This is where Medigap steps in. If you have a comprehensive Medigap policy, it will pay that $217 daily coinsurance, saving you thousands of dollars during your recovery.

Custodial Care Exclusion

However, if you simply need help with "Activities of Daily Living"—such as bathing, dressing, eating, or using the bathroom—this is classified as custodial care. Medicare does not cover custodial care. Because Medicare denies it, your Medigap plan will not pay a single cent toward a long-term stay in a nursing home, assisted living facility, or for a private-duty nurse in your home.

To cover these expenses, you would need to purchase a separate Long-Term Care insurance policy, spend down your assets to qualify for Medicaid, or pay out of pocket.

High-Deductible Medigap Plans: What You Pay Before Coverage Kicks In

While standard Medigap plans cover your medical gaps from day one, it is important to understand the specific exclusions of High-Deductible Medigap plans. If you enroll in High-Deductible Plan G (or the older Plans F and J), the plan does not cover any of your Medicare deductibles, copays, or coinsurance until you reach a strict out-of-pocket threshold.

High-Deductible Limits for 2026 and 2027

If you choose a High-Deductible Medigap plan to secure a lower monthly premium, you must be prepared to pay your own medical bills up to the deductible limit:

• 2026 High Deductible: The deductible you must pay before the plan pays anything is $2,950.
• 2027 High Deductible: CMS has announced this deductible will increase to $3,050.

For example, if you have High-Deductible Plan G in 2026 and go to the hospital, you are responsible for paying the $1,736 Part A deductible yourself, because you have not yet reached your $2,950 plan deductible. Only after your approved out-of-pocket medical expenses cross that $2,950 threshold will the Medigap plan step in to cover the rest of your Medicare-approved costs for the year.

Plans K and L Out-of-Pocket Limits

Similarly, Medigap Plans K and L offer lower premiums in exchange for cost-sharing. Instead of covering 100% of your Part B coinsurance, Plan K covers 50% and Plan L covers 75%. You must pay the remainder until you hit the plan's out-of-pocket limit.

• Plan K Limits: Capped at $8,000 in 2026, rising to $8,360 in 2027.
• Plan L Limits: Capped at $4,000 in 2026, rising to $4,180 in 2027.

Understanding these financial boundaries ensures you are not caught off guard by medical bills early in the calendar year.

Medigap vs. Medicare Advantage: Understanding the Coverage Divide

When you first enroll in Medicare, you face a fork in the road: choose Original Medicare plus Medigap, or choose a private Medicare Advantage (Part C) plan. The differences in what they cover—and how they cover it—are profound.

Medicare Advantage plans replace Original Medicare and often bundle extra perks into a single network-based plan. Because Medigap strictly supplements Original Medicare, it does not offer these bundled perks.

Coverage Comparison Table

While Medicare Advantage might look appealing because it bundles dental, vision, and drugs, it comes with strict network limitations and higher out-of-pocket costs for severe illnesses. Medigap gives you total freedom to see any doctor nationwide without referrals, prioritizing comprehensive medical coverage over routine perks.

Navigating Your Medigap Open Enrollment Period Without Mistakes

Because Medigap does not cover everything, you might wonder if you can just switch plans later if you become unhappy with your coverage. This is a dangerous assumption. Medigap enrollment is subject to strict federal and state rules.

The 6-Month Guaranteed Issue Window

Your Medigap Open Enrollment Period (OEP) is a one-time, 6-month window that begins the first month you are 65 or older and enrolled in Medicare Part B. During this exact window, you have a "guaranteed issue" right. This means insurance companies cannot deny you a policy, nor can they charge you higher premiums due to pre-existing health conditions.

The Dangers of Medical Underwriting

Many consumers confuse the annual Fall Medicare Open Enrollment Period (Oct 15 - Dec 7) with Medigap enrollment. The Fall period is for changing Part D drug plans and Medicare Advantage plans. It does not give you a free pass to buy or switch Medigap policies.

If you apply for Medigap outside of your one-time 6-month OEP, insurers in most states are legally allowed to use medical underwriting. They will review your health history, your current medications, and any pre-existing conditions. Based on this review, they can legally deny your application entirely or charge you significantly higher premiums.

Therefore, it is crucial to purchase your Medigap plan during your initial 6-month window and simultaneously purchase your standalone Part D plan to ensure you have no gaps in your medical or prescription coverage.

How Medigap Premiums Are Priced

While Medigap benefits are standardized, the premiums are not. Private insurance companies set their own rates, and they price their policies in three distinct ways. Understanding these pricing models will help you budget for the costs that Medigap itself represents.

• Community-Rated: Everyone in a specific geographic area pays the same premium, regardless of age. Premiums may go up due to inflation, but not because you are getting older.
• Issue-Age-Rated: The premium is based on your age when you first buy the policy. If you buy at 65, you will always pay the rate of a 65-year-old. It will not increase automatically just because you celebrate a birthday, though inflation adjustments still apply.
• Attained-Age-Rated: The premium starts low but automatically increases every year as you get older. These plans look cheap at age 65 but can become prohibitively expensive by age 80.

Always ask how a policy is rated before you buy, as this dictates your long-term out-of-pocket costs.

Sensible Ways to Manage Routine Care Costs Alongside Medigap

Now that you know exactly what Medigap does not cover, you need a strategy to manage your routine healthcare costs. You do not have to go without dental or vision care just because Medigap excludes it. Here is a sensible checklist to build a complete healthcare safety net:

• Purchase Standalone Dental and Vision Insurance: Many private insurers sell affordable policies designed specifically for seniors. These plans typically cover cleanings, exams, and provide allowances for glasses and major dental work.
• Enroll in a Part D Plan Immediately: Do not wait until you are sick. Buy a Part D plan during your Initial Enrollment Period to secure the 2026/2027 out-of-pocket caps and avoid the permanent 1% monthly penalty.
• Look into Discount Programs: If you don't want to pay monthly premiums for dental or vision insurance, consider joining a discount network. For a small annual fee, you get access to a network of providers who agree to charge reduced rates for services.
• Self-Fund Routine Care: If your teeth and eyes are generally healthy, it may be more cost-effective to set aside a small amount of money each month in a dedicated savings account to pay for your bi-annual cleanings and eye exams out of pocket.

How to Compare Medigap Rates and Find the Right Fit

Medigap is the gold standard for protecting yourself against massive hospital and medical bills, but it requires you to be proactive about your medications and routine care. Because the medical benefits of a Plan G or Plan N are identical across all insurance companies, your primary goal should be finding a financially stable insurer offering the lowest premium in your zip code.

At Rebel Rates, we believe in giving you the numbers without the sales pressure. We help you cut through the noise to find the most competitive rates available. If you are ready to see real prices for your specific age and location, you can compare Medicare quotes securely on our site. No BS, just the lowest rates to help you secure the medical coverage you need.