Original Medicare provides coverage for a broad range of health care services, but it does not pay for everything. Deductibles, copayments, and coinsurance can accumulate rapidly, particularly during a hospital admission or a year with several medical procedures. Medicare Supplement plans, commonly called Medigap, are built to close those gaps. But given the monthly premiums involved, many beneficiaries wonder whether these plans genuinely justify the expense.
What Medigap Plans Cover
Medigap plans are offered by private insurance companies but regulated and standardized by the federal government. Each plan is designated by a letter, and every insurer selling a particular plan letter must deliver the same fundamental benefits. For a side-by-side breakdown, see our Medigap plan comparison. This standardization simplifies comparison shopping across carriers.
The gaps that Medigap addresses include:
- Part A coinsurance and hospital expenses beyond what Original Medicare pays, including coverage for up to 365 additional days after Medicare benefits run out
- Part B coinsurance or copayments, representing 20 percent of the Medicare-approved amount for outpatient services
- Part A hospice care coinsurance or copayment
- Skilled nursing facility coinsurance for days 21 through 100
- Part A deductible, which applies per benefit period for inpatient hospital stays
- Part B deductible (included in select plans)
- Part B excess charges, the amount providers may bill above the Medicare-approved rate (included in select plans)
- Foreign travel emergency care up to plan limits (included in most plans)
Medigap plans do not pay for prescription drugs, dental care, vision care, hearing aids, or long-term care. You will need a separate Part D plan for medication coverage.
Comparing Premiums to Potential Savings
The fundamental question is whether the monthly premium you pay for a Medigap plan justifies the out-of-pocket expenses you would otherwise incur. The answer hinges on how much health care you consume.
Consider these potential expenses under Original Medicare without supplemental coverage:
- The Part A deductible applies each time you are hospitalized, and it resets with every new benefit period. A single hospital stay can cost you well over a thousand dollars.
- Part B services carry a 20 percent coinsurance with no annual out-of-pocket ceiling. A major surgery or prolonged outpatient treatment could generate thousands of dollars in cost-sharing.
- Skilled nursing facility stays involve several hundred dollars per day in coinsurance beginning on day 21.
Medigap premiums differ substantially based on the plan letter, your geographic location, the insurance carrier, and your age. Monthly premiums can range from below $100 to above $300. For many beneficiaries, paying a consistent monthly premium delivers peace of mind and financial security against a single costly health event.
People in generally good health may view Medigap premiums as an unnecessary expense. Yet health care needs are inherently unpredictable, and a single hospitalization or surgical procedure can quickly surpass what you would have spent in annual Medigap premiums.
Who Gets the Most Value from Medigap
Medigap plans are not ideal for everyone, but certain groups tend to gain the most:
- Regular health care users: If you visit specialists frequently, undergo routine testing, or manage ongoing conditions, the 20 percent Part B coinsurance builds up. Medigap removes or lowers that cost-sharing.
- Frequent travelers: Original Medicare typically does not cover health care received outside the United States. Most Medigap plans include foreign travel emergency coverage, which is beneficial for retirees who spend time overseas.
- Those seeking cost predictability: With a comprehensive Medigap plan, your out-of-pocket spending becomes highly predictable. You pay your premium and very little beyond that, making health care budgeting much easier.
- Beneficiaries wanting broad provider access: Unlike Medicare Advantage, Medigap functions with any provider that accepts Medicare anywhere in the country. You face no referral requirements or network limitations.
Conversely, if you are in good health, consume very little health care, and are willing to accept some financial exposure, you may conclude that the premiums are not worth it. Some beneficiaries select Medicare Advantage as a lower-premium alternative that still offers out-of-pocket caps, albeit with network constraints.
Optimal Enrollment Timing
Timing is critical with Medigap. Your Medigap Open Enrollment Period starts the month you turn 65 and are enrolled in Part B, running for six months. During this window, you hold guaranteed issue rights, which means:
- Insurers must sell you any Medigap plan they offer
- They cannot charge you higher premiums due to current or past health conditions
- They cannot reject your application or impose waiting periods for pre-existing conditions
After this six-month window closes, insurers in most states may apply medical underwriting. That means they can turn down your application, set higher premiums based on health issues, or exclude coverage for pre-existing conditions. Some states provide extra protections, but the federal guarantee applies only during your initial open enrollment.
This is why signing up during your open enrollment period is highly advisable, even if you are uncertain about keeping the plan long-term. Locking in coverage while you have guaranteed access preserves options you may not have in the future.
Popular Plans: Plan G and Plan N
Although several Medigap plan letters are available, two have gained particular popularity in recent years:
Plan G is the most thorough Medigap plan currently offered to new enrollees. It covers all standard Medigap benefits except the Part B deductible, which you pay once annually. After satisfying that deductible, Plan G effectively eliminates your remaining out-of-pocket costs for Medicare-covered services.
Plan N carries a lower monthly premium than Plan G in exchange for modestly higher cost-sharing. With Plan N, you may owe a small copayment for certain office visits and emergency room visits, and you are responsible for any Part B excess charges. For beneficiaries looking to balance premium expenses with strong coverage, Plan N serves as a popular compromise.
Both plans are offered by multiple insurers, and because the benefits are standardized, the only distinctions between companies are premium pricing and customer service quality.
Balancing the Pros and Cons
Benefits of Medigap:
- Predictable and frequently minimal out-of-pocket expenses
- Freedom to visit any Medicare-accepting provider nationwide
- No network limitations or referral requirements
- Guaranteed renewable as long as premiums are paid
Drawbacks of Medigap:
- Monthly premiums in addition to your Part B premium
- No prescription drug coverage included
- Generally no dental, vision, or hearing benefits
- Medical underwriting may apply if you miss your open enrollment window
Whether a Medigap plan justifies the cost ultimately comes down to your individual health, finances, and comfort with risk. For many Medicare beneficiaries, the combination of comprehensive coverage and spending predictability makes Medigap one of the most worthwhile investments in their retirement health care plan.