If you're a Medicare beneficiary trying to figure out whether your current coverage is still the best fit, you're asking exactly the right question — and the answer is more nuanced than any single ranking can capture. Medicare Supplement insurance, commonly called Medigap, has become the coverage of choice for beneficiaries who want predictable costs and the freedom to see any doctor or specialist who accepts Medicare, anywhere in the country. But the landscape of available plans, pricing, and state-specific rules has shifted enough in recent years that what was a great choice three years ago may no longer be the best deal today.
Medigap plans are standardized by the federal government, meaning a Plan G sold by one insurer covers exactly the same benefits as a Plan G sold by a competitor. What differs — sometimes dramatically — is the premium. In 2025, a 70-year-old woman in Texas might pay anywhere from $120 to $220 per month for the same Plan G depending on which insurance company she chooses. Over a year, that's a difference of up to $1,200 for identical coverage. This is why comparing insurers matters so much, and why sticking with the first plan you enrolled in without ever shopping around can cost you real money over time.
For most new Medicare enrollees today, Plan G has emerged as the strongest all-around option. It covers the Part A hospital deductible ($1,676 in 2025), Part A coinsurance and hospital costs, Part B coinsurance or copayments, skilled nursing facility coinsurance, and foreign travel emergency care (up to plan limits). The only gap it leaves is the Part B deductible, which is $257 in 2025 — a modest annual expense compared to the comprehensive protection the plan provides. Plan F, which covered the Part B deductible as well, is no longer available to beneficiaries who became eligible for Medicare after January 1, 2020, so Plan G has effectively taken its place as the gold standard for new enrollees.
Plan N is worth a close look for beneficiaries who are generally healthy and comfortable with some cost-sharing. Plan N typically carries a lower monthly premium than Plan G — sometimes $30 to $60 less per month — but requires copayments of up to $20 for office visits and up to $50 for emergency room visits that don't result in inpatient admission. It also does not cover Part B excess charges, which are the additional amounts some doctors charge above Medicare's approved rate. If you live in a state that prohibits balance billing — meaning doctors cannot charge more than Medicare's rate — Plan N becomes significantly more attractive because the excess charge gap essentially disappears. States like Connecticut, Massachusetts, Minnesota, New York, Ohio, Pennsylvania, Rhode Island, and Vermont have restrictions on balance billing that can make Plan N a smarter financial choice.
High-deductible Plan G is another option that deserves attention, particularly for beneficiaries who are in good health and want the lowest possible monthly premium. In 2025, the deductible for this plan is $2,870. Once you meet that deductible, the plan covers everything standard Plan G covers. The monthly premiums can be dramatically lower — sometimes under $50 per month for a 65-year-old — making it appealing for people who rarely use medical services but want catastrophic protection. The math works in your favor if you stay healthy; it works against you in a year with significant medical needs. This plan is best suited for beneficiaries who have savings to cover the deductible if needed and who are prioritizing premium savings over predictability.
Timing matters enormously when it comes to Medigap enrollment. Your best window is the six-month Medigap Open Enrollment Period that begins the month you turn 65 and are enrolled in Medicare Part B. During this window, insurers cannot deny you coverage or charge you more based on your health history — this is called guaranteed issue. Once that window closes, most states allow insurers to use medical underwriting, meaning they can reject your application or charge higher premiums based on pre-existing conditions. If you miss your initial enrollment window and are in average or below-average health, switching to Medigap later can be difficult or expensive.
However, residents of certain states have an additional annual opportunity. Thirteen states have adopted what's known as the birthday rule, which gives Medigap enrollees a 30-day window around their birthday each year to switch to a plan with equal or lesser benefits from a different insurer — without medical underwriting. Those states are California, Idaho, Illinois, Kentucky, Louisiana, Maine, Maryland, Missouri, Nevada, New Jersey, New York, Oklahoma, and Oregon. If you live in one of these states and have been paying high premiums with your current insurer, your birthday window is a genuine opportunity to shop for a better rate on the same coverage. Contact your state's insurance commissioner's office for details on how the birthday rule works in your specific state, as the exact rules and timelines can vary slightly.
Medicare Advantage plans — the private insurance alternative to Original Medicare — have seen enrollment growth slow and, in some markets, reverse slightly as beneficiaries have experienced prior authorization denials, narrow networks, and unexpected out-of-pocket costs. For beneficiaries who enrolled in Medicare Advantage primarily for the low or zero-dollar premiums, it's worth calculating your actual annual costs including copayments, coinsurance, and the maximum out-of-pocket limit, which can reach $9,350 for in-network services in 2025 under standard Medicare Advantage plans. Comparing that total exposure against a Medigap premium plus Part D drug plan premium can reveal that Medigap is more cost-effective than it first appears, especially for anyone with chronic conditions or regular specialist visits.
If you're currently in Medicare Advantage and want to switch to Original Medicare with a Medigap plan, the Medicare Open Enrollment Period running January 1 through March 31 each year allows you to return to Original Medicare. However, outside of guaranteed issue situations — such as your plan leaving your area or losing coverage through no fault of your own — you may face medical underwriting when applying for Medigap. The exceptions include beneficiaries in guaranteed issue states or those within their initial enrollment window. Speaking with a licensed, independent insurance broker who works with multiple carriers can help you understand your options without being steered toward a single company's products.
Prescription drug coverage is a separate but equally important piece of the puzzle. Medigap plans do not cover prescription drugs, so beneficiaries with Medigap need a standalone Part D plan. Part D premiums, deductibles, and formularies change every year, and the plan that covered your medications well in 2024 may have changed its formulary for 2025. The Annual Enrollment Period from October 15 through December 7 is your opportunity to review and switch Part D plans. Medicare's Plan Finder tool at Medicare.gov allows you to enter your specific medications and compare actual costs across available Part D plans in your zip code — this is the most reliable way to find the plan that minimizes your drug costs for the coming year.
The bottom line for beneficiaries evaluating their Medicare coverage right now is this: standardization works in your favor with Medigap, but only if you use it. Because the benefits are identical across insurers for the same plan letter, the only rational reason to pay more is if you haven't compared. Use Medicare.gov's Medigap comparison tool, contact your State Health Insurance Assistance Program (SHIP) counselor for free, unbiased help, and if you're in a birthday rule state, mark your calendar. The best Medicare choice isn't a single plan — it's the right combination of coverage and cost for your specific health needs, budget, and where you live.