If you are on Medicare or approaching it, the question of whether your current coverage still makes financial sense deserves a serious look right now. The core choice has not changed — Original Medicare paired with a Medigap supplement plan versus Medicare Advantage — but the numbers behind that choice have shifted enough in 2025 that what worked five years ago may no longer be the best fit for your health needs or your budget. Understanding the specific dollar figures, enrollment windows, and plan structures involved is the only way to make a genuinely informed decision.
Medigap, formally called Medicare Supplement Insurance, is where the most actionable decisions live for most beneficiaries. These plans are sold by private insurers but standardized by the federal government, which means a Plan G from Humana covers exactly the same benefits as a Plan G from Mutual of Omaha or Blue Cross Blue Shield. What differs — sometimes dramatically — is the monthly premium. In 2025, a 65-year-old woman in a mid-sized city might pay anywhere from $110 to $220 per month for the same Plan G depending entirely on which insurer she selects. That is a difference of up to $1,320 per year for coverage that is letter-for-letter identical. Over five years, the gap can exceed $6,500. Shopping multiple carriers is not a nice-to-have — it is financially necessary, and the Medicare Plan Finder at Medicare.gov allows you to compare Medigap premiums by ZIP code at no cost.
Plan G has become the standard recommendation for new Medicare enrollees since Plan F was closed to anyone who first became eligible for Medicare on or after January 1, 2020. Plan F was the most comprehensive Medigap option ever offered because it covered everything, including the Part B deductible. Plan G covers everything Plan F did except that deductible, which is $257 in 2025. The math is straightforward: if Plan G costs you even $22 less per month than a Plan F policy — and it typically costs considerably more than that less — you are saving $264 annually while paying only $257 out of pocket for the deductible. You come out ahead, and you get identical coverage for every dollar of care beyond that deductible. For anyone who enrolled in Medicare before January 1, 2020, Plan F remains available, but comparing its premium against Plan G is worth doing every year.
Plan N is a third option that deserves attention, particularly for beneficiaries who are relatively healthy and want to reduce their monthly premium. Plan N typically costs $30 to $60 less per month than Plan G, which translates to $360 to $720 in annual savings. The trade-off is that Plan N includes copayments of up to $20 for office visits and up to $50 for emergency room visits that do not result in inpatient admission. It also does not cover Part B excess charges — the additional fees that some physicians charge above Medicare's approved rate, which can be up to 15 percent more than the Medicare-approved amount. If you live in a state that prohibits excess charges, such as New York, Massachusetts, Ohio, or Connecticut, that gap disappears entirely and Plan N becomes considerably more attractive. A healthy 65-year-old who visits the doctor four or five times a year and lives in a no-excess-charge state could save $500 or more annually with Plan N compared to Plan G.
Medicare Advantage, also called Part C, dominates television and mail advertising for good reason — it is the product insurers most actively market. These plans bundle Part A, Part B, and usually Part D drug coverage into a single plan offered by a private insurer. Many carry $0 monthly premiums, and extras like dental, vision, hearing, and gym memberships are real benefits that some beneficiaries genuinely value. But the financial structure of Medicare Advantage is fundamentally different from Medigap, and that difference matters most when you are seriously ill.
In 2025, the maximum out-of-pocket limit for Medicare Advantage plans is $9,350 for in-network services. On a PPO plan that allows out-of-network care, your exposure can be higher still. That ceiling is a protection, but it is also a signal: in a year involving cancer treatment, a major surgery, or a serious hospitalization, you could owe close to $9,400 before your plan covers 100 percent of costs. A beneficiary on Original Medicare with Plan G, by contrast, owes only the $257 Part B deductible for the entire year — no matter how many hospitalizations, specialist visits, or procedures occur. For anyone managing a chronic condition, undergoing chemotherapy, or facing frequent medical care, the Medigap model provides a level of financial predictability that Medicare Advantage structurally cannot match.
Network restrictions are the second major consideration with Medicare Advantage. Most HMO-based plans require you to use in-network providers, and those networks vary significantly by county and region. Rural beneficiaries have faced particular challenges as some insurers have narrowed their networks or exited markets entirely. In 2024 and into 2025, several major insurers including Humana and UnitedHealthcare reduced their Medicare Advantage footprints in specific counties, leaving some enrollees needing to find new plans during the Annual Enrollment Period, which runs October 15 through December 7 each year. If your plan exits your service area, you receive a Special Enrollment Period to switch, but your options may be limited depending on where you live and what plans remain available in your county.
The timing of your Medigap enrollment is one of the most consequential and least understood aspects of Medicare planning. When you first enroll in Medicare Part B, you have a six-month guaranteed issue window during which any insurer must sell you any Medigap plan at standard rates, regardless of your health history or pre-existing conditions. Once that window closes, insurers in most states can legally reject your application or charge you higher premiums based on your medical history. This is not a theoretical risk. A beneficiary who enrolls in Medicare Advantage at 65 and then wants to switch to Medigap at 70 may find that insurers can deny them coverage outright in most states — leaving them with no path to the comprehensive coverage they want.
Thirteen states currently offer additional consumer protections through what is known as the birthday rule, which gives Medigap enrollees a 30-day window around their birthday each year to switch to a different Medigap plan without medical underwriting. Those states are California, Idaho, Illinois, Kentucky, Louisiana, Maine, Maryland, Missouri, Nevada, New Jersey, New York, Oklahoma, and Oregon. If you already have a Medigap plan and live in one of these states, your annual birthday window may be an opportunity to switch to a lower-premium plan with the same or comparable coverage without answering any health questions. New York and Connecticut go further still, offering guaranteed issue rights for Medigap plans year-round, making them among the most consumer-protective states in the country for supplement coverage.
For beneficiaries currently on Medicare Advantage who want to explore switching to Original Medicare with a Medigap plan, the Open Enrollment Period running January 1 through March 31 each year allows you to drop Advantage and return to Original Medicare. However, returning to Original Medicare during the OEP does not automatically guarantee you Medigap coverage. You will still need to apply to a Medigap insurer separately and may face medical underwriting unless you live in a guaranteed issue state, qualify under your state's birthday rule, or have a specific triggering event — such as your plan leaving your service area — that creates a Special Enrollment Period with guaranteed issue rights. Understanding which protections apply in your state before you make any changes is essential.
Prescription drug coverage adds another layer to this decision. If you choose Original Medicare with a Medigap plan, you will need to purchase a separate Part D drug plan. Part D premiums, deductibles, and formularies vary widely by plan and by the specific medications you take. Starting in 2025, the Inflation Reduction Act capped out-of-pocket drug costs at $2,000 annually for all Part D enrollees — a significant change that reduces one of the largest financial risks for people on multiple medications. This cap applies whether you are enrolled in a standalone Part D plan alongside Original Medicare and Medigap, or in a Medicare Advantage plan that includes drug coverage. If you are currently spending more than $2,000 per year on covered drugs, this cap is already working in your favor.
The practical steps for making the best choice are manageable. Start by pulling your plan's Annual Notice of Change, which insurers are required to mail by September 30 each year. This document details every change coming to your plan — premiums, copayments, formulary updates, and network changes. Then use the Plan Finder tool at Medicare.gov to compare your current plan against alternatives in your ZIP code. For Medigap specifically, your State Health Insurance Assistance Program, known as SHIP, offers free, unbiased counseling from trained volunteers who can walk you through your options without any sales agenda. You can find your local SHIP counselor through Medicare.gov or by calling 1-800-MEDICARE (1-800-633-4227).
If you are approaching 65 and enrolling in Medicare for the first time, the single most important financial decision you can make is to enroll in Part B on time and use your guaranteed issue window to secure a Medigap plan if that model fits your needs and budget. The cost of missing that window — in the form of potential future denial or premium surcharges — can far exceed any short-term savings from delaying enrollment or choosing a plan without fully understanding the underwriting rules. For those already enrolled, the Annual Enrollment Period each fall from October 15 through December 7 is your primary opportunity to make changes to Advantage or Part D plans, while Medigap changes can happen year-round subject to the underwriting rules in your state.