Understanding your health insurance options after 65 can mean the difference between financial security and devastating medical debt — here’s what you need to know.
When Margaret, 67, was diagnosed with atrial fibrillation (an irregular heart rhythm), she assumed her Medicare plan would cover everything. It wasn’t until she received a $4,200 bill for a two-night hospital stay that she realized there were significant gaps in her coverage she hadn’t planned for.
Her story isn’t unusual. According to the Kaiser Family Foundation, nearly one in four Medicare beneficiaries spends more than $2,000 out of pocket on healthcare each year — and many don’t fully understand what their plan covers until it’s too late.
If you’re approaching 65 or already enrolled in Medicare, this guide is for you. We’ll break down how Medicare works, what Medigap (Medicare Supplement Insurance) covers, how Medicare Advantage differs, and what practical steps you can take right now to protect your health and your finances.
What Is Medicare — and Who Qualifies?
Medicare is the federal health insurance program designed primarily for Americans aged 65 and older. It also covers certain younger individuals with disabilities or specific conditions such as end-stage renal disease (kidney failure requiring dialysis or transplant).
As of 2026, the Centers for Medicare & Medicaid Services (CMS) reports that over 67 million Americans are enrolled in Medicare — a number that continues to grow as Baby Boomers age into eligibility.
Medicare is divided into distinct parts, each covering different types of care:
- Part A (Hospital Insurance): Covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health services. Most people don’t pay a premium for Part A if they or their spouse paid Medicare taxes for at least 10 years.
- Part B (Medical Insurance): Covers outpatient care, doctor visits, preventive services, and medically necessary equipment. In 2026, the standard monthly premium is tied to your income.
- Part C (Medicare Advantage): A private insurance alternative to Original Medicare that bundles Parts A and B — and usually Part D — often with added benefits like dental and vision.
- Part D (Prescription Drug Coverage): Adds coverage for prescription medications through private insurers approved by Medicare.
Understanding this structure is the first step toward making informed decisions about your senior health insurance coverage.
The Coverage Gaps Most Seniors Don’t Expect
Original Medicare — Parts A and B — does not cover everything. In fact, it leaves several significant gaps that can lead to serious out-of-pocket expenses for older adults.
A 2024 Commonwealth Fund analysis found that Original Medicare covers approximately 80% of approved medical costs, leaving beneficiaries responsible for the remaining 20% — with no annual out-of-pocket maximum to protect them.
Common coverage gaps include:
- No out-of-pocket maximum: Unlike most private insurance, Original Medicare has no cap on what you could spend in a year.
- Hospital deductibles: Part A has a deductible per benefit period (not per year), meaning you could face it multiple times annually if you’re hospitalized more than once.
- Skilled nursing coinsurance: After day 20 in a skilled nursing facility, you pay a daily coinsurance that can add up quickly.
- No routine dental, vision, or hearing: Routine dental cleanings, eyeglasses, and hearing aids are generally not covered under Original Medicare.
- Limited long-term care coverage: Medicare does not cover custodial (long-term) care in nursing homes or assisted living facilities.
- Foreign travel emergencies: Care received outside the United States is rarely covered.
These gaps are exactly why supplemental insurance options like Medigap and Medicare Advantage exist — and why understanding them matters so much for your long-term wellbeing.
What Is Medigap (Medicare Supplement Insurance)?
Medigap is private insurance sold to fill the gaps left by Original Medicare. Sometimes called Medicare Supplement Insurance, these plans are standardized by the federal government, meaning a Plan G from one insurer offers the same core benefits as Plan G from another — though premiums can vary widely.
According to the American Association for Medicare Supplement Insurance, approximately 14 million Medicare beneficiaries are enrolled in some form of Medigap coverage.
The most popular Medigap plans in 2026 include:
- Plan G: The most comprehensive option currently available to new enrollees (Plan F was discontinued for those new to Medicare after January 1, 2020). Plan G covers the Part A deductible, coinsurance, skilled nursing coinsurance, and foreign travel emergencies — leaving only the Part B deductible for you to pay.
- Plan N: A lower-premium alternative that covers most gaps but requires small copayments for some office and emergency room visits.
- Plan K and Plan L: Budget-friendly options with out-of-pocket limits, though they cover a smaller percentage of costs.
Important to note: Medigap plans work only with Original Medicare — they cannot be combined with Medicare Advantage. You must also be enrolled in both Part A and Part B to purchase a Medigap plan.
The best time to enroll in Medigap is during your Open Enrollment Period, which starts the month you turn 65 and are enrolled in Part B. During this six-month window, insurers cannot deny you coverage or charge more because of pre-existing conditions.
Medicare Advantage vs. Original Medicare + Medigap: Which Is Right for You?
This is one of the most common — and consequential — decisions seniors face when it comes to health insurance. Research suggests there is no single right answer; the best choice depends on your health status, where you live, your budget, and how much you value flexibility.
Here’s a side-by-side comparison to help you think it through:
Original Medicare + Medigap:
- See any doctor or specialist who accepts Medicare — no referrals needed
- Higher monthly premiums (Part B premium + Medigap premium)
- Predictable, low out-of-pocket costs once deductible is met
- No network restrictions — great for frequent travelers or snowbirds
- Does not include dental, vision, or hearing by default
- Requires separate Part D plan for drug coverage
Medicare Advantage (Part C):
- Often lower or $0 monthly premiums beyond the Part B premium
- Includes Part D and often dental, vision, and hearing
- Restricted networks (HMO or PPO structures)
- May require referrals for specialist visits
- Out-of-pocket maximum limits your annual exposure
- Extra benefits vary significantly by plan and geographic area
According to CMS data, over half of all Medicare-eligible Americans are enrolled in Medicare Advantage plans as of 2026 — a significant shift from just a decade ago. However, clinical researchers at Harvard Health caution that plan quality varies enormously, and some patients with complex or chronic conditions may find Original Medicare plus a Medigap plan offers more consistent access to specialists.
If you’re managing a chronic condition like type 2 diabetes, heart disease, or cancer, the ability to see any Medicare-accepting physician without referrals can be a meaningful advantage. For those who are generally healthy and price-sensitive, Medicare Advantage may offer compelling value.
Prescription Drug Coverage: Understanding Part D
Prescription drug costs are one of the top financial concerns for older Americans. The good news: the Inflation Reduction Act of 2022 introduced landmark changes to Medicare Part D that took full effect by 2025, including a $2,000 annual out-of-pocket cap on prescription drug spending for Medicare beneficiaries — a historic shift that has reduced costs significantly for people on expensive medications.
Here’s what you should know about Part D:
- Enrollment timing matters: If you don’t sign up for Part D when first eligible and go 63 or more consecutive days without creditable prescription drug coverage, you may face a permanent late enrollment penalty added to your monthly premium.
- Formularies vary: Each Part D plan has a list of covered drugs (called a formulary) divided into tiers. Generic drugs typically cost less; specialty drugs may still carry significant cost-sharing even with the new cap.
- Extra Help (Low Income Subsidy): The Social Security Administration offers the Extra Help program for beneficiaries with limited income and resources, which can dramatically reduce Part D premiums and cost-sharing. According to SSA, millions of eligible seniors don’t apply because they’re unaware of it.
- Annual review is essential: Formularies change every year. During Medicare’s Annual Enrollment Period (October 15 – December 7), review your plan’s formulary to ensure your medications are still covered at favorable tiers.
If you’re already managing a complex medication regimen — for conditions like hypertension, diabetes, or thyroid disease — a careful Part D plan comparison using Medicare’s Plan Finder tool (available at medicare.gov) can save you hundreds or even thousands of dollars annually.
Preventive Care Benefits You May Not Know About
One of Medicare’s most underutilized features is its extensive preventive care coverage. Under Part B, Medicare covers a wide range of screenings and services at no cost to you — meaning no copay and no deductible applied — when ordered by a participating provider.
Covered preventive services include:
- Annual Wellness Visit (not the same as a traditional physical — this is a health risk assessment and personalized prevention plan)
- Colorectal cancer screenings (colonoscopy, stool-based tests)
- Cardiovascular disease screening (cholesterol, lipid panel)
- Diabetes screening and diabetes self-management training
- Depression screening
- Mammograms and cervical cancer screenings
- Bone density scans for osteoporosis risk
- Flu, pneumococcal, and COVID-19 vaccines
Research from the NIH and CDC consistently shows that early detection through preventive screenings significantly reduces morbidity (illness burden) and mortality (death rates) across all major chronic disease categories. Using these benefits isn’t just smart financially — it’s one of the most powerful things you can do for your long-term health.
For more on how health insurance covers preventive care, see our related guide: Health Insurance and Preventive Care: What’s Covered.
When to Get Help — and Red Flags to Watch For
Navigating Medicare can feel overwhelming, especially during major transitions like initial enrollment, a serious diagnosis, or a move to a new state. Here are situations where you should seek professional guidance promptly:
Contact Social Security or Medicare directly if:
- You’re approaching 65 and haven’t started the enrollment process (apply three months before your 65th birthday)
- You’ve lost employer-sponsored coverage and need to understand your Special Enrollment Period options
- You’re unsure whether your employer coverage qualifies as "creditable coverage" (delaying enrollment without creditable coverage can result in permanent penalties)
Contact a State Health Insurance Assistance Program (SHIP) counselor if:
- You need free, unbiased help comparing plans in your area
- You’re reviewing plans during Annual Enrollment Period and aren’t sure which is best for your medication needs
- You believe you’ve been billed incorrectly or your claim was wrongly denied
Seek immediate medical care — and notify your insurer — if:
- You experience a sudden change in health requiring emergency hospitalization
- You’re transferred to a skilled nursing facility — confirm coverage duration early to avoid unexpected bills
- You receive a large unexpected bill that doesn’t match your plan’s explanation of benefits (EOB) — billing errors are more common than most people realize
Understanding your coverage before a crisis occurs is far less stressful — and far less costly — than sorting it out afterward. This is especially true if you’re managing a chronic condition where consistent access to care is non-negotiable. Our guide on Health Insurance Costs Explained: Deductibles, Copays can help you decode the financial terminology on your plan documents.
Frequently Asked Questions
Q: Can I have both Medicare Advantage and a Medigap plan?
A: No. Medigap (Medicare Supplement Insurance) can only be used alongside Original Medicare (Parts A and B). If you’re enrolled in a Medicare Advantage plan, you cannot use a Medigap policy to cover your out-of-pocket costs. If you want the flexibility of Medigap, you’ll need to return to Original Medicare first.
Q: What happens if I miss my Medicare enrollment window?
A: If you miss your Initial Enrollment Period and don’t have other qualifying coverage, you may face late enrollment penalties. For Part B, the penalty is a permanent 10% increase in your premium for each 12-month period you went without coverage. For Part D, the penalty is based on how long you went without creditable drug coverage. These penalties can add up significantly over time, so enrolling on time is critical.
Q: Does Medicare cover long-term care in a nursing home?
A: Medicare covers only short-term skilled nursing facility care under specific conditions — typically following a qualifying hospital stay of at least three days. Medicare does not cover custodial (long-term) care, which includes help with daily activities like bathing and dressing. For long-term care coverage, separate long-term care insurance or Medicaid (for those who qualify financially) would be needed.
Q: Are there income-based savings programs that can help reduce my Medicare costs?
A: Yes. Medicare Savings Programs (MSPs), administered through Medicaid, help low- to moderate-income beneficiaries pay for Part B premiums, deductibles, and coinsurance. Additionally, the Extra Help program reduces Part D costs. The Social Security Administration and your state Medicaid office can help you determine if you qualify. Many eligible seniors miss out on these benefits simply because they don’t know they exist.
Q: How do I compare Medicare Part D plans to find the best one for my medications?
A: Medicare’s official Plan Finder tool allows you to enter your specific medications and dosages to compare how much each plan would cost you annually — including premiums, deductibles, and drug cost-sharing. It’s highly recommended that you review and potentially switch plans during the Annual Enrollment Period (October 15 – December 7) each year, as formularies and pricing change annually. A SHIP counselor can walk you through this process for free.
Conclusion
Health insurance in your senior years isn’t just a financial tool — it’s a fundamental part of protecting your health and your quality of life. Whether you’re choosing between Original Medicare and Medicare Advantage, weighing the value of a Medigap plan, or trying to get the most out of your preventive care benefits, the decisions you make now have real consequences for your wellbeing down the road.
The most important thing you can do is start informed. Take advantage of free SHIP counseling, use Medicare’s official comparison tools, and don’t wait until a health crisis forces your hand.
And always — always — involve your primary care physician in these conversations. Your doctor understands your health needs better than any insurance brochure, and a good healthcare provider can help you identify which coverage structure best supports your ongoing care plan.
This article is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Always consult your physician or a qualified healthcare provider before making changes to your health routine or treatment plan.
Medically reviewed by our editorial health team. Content follows evidence-based standards aligned with CDC, NIH, and CMS guidelines.