How to Choose the Right Medicare Plan
How to Choose the Right Medicare Plan
Choosing the right Medicare plan is one of the most consequential decisions a retiree makes — and it is not simply a matter of comparing monthly premiums. Medicare is a framework, not a single product, and the combination of choices a person makes at initial enrollment creates a coverage structure that affects out-of-pocket exposure, provider access, prescription drug costs, and long-term flexibility for years to come. The most common mistake is treating the first Medicare enrollment as a low-stakes decision that can easily be reversed later. In practice, switching from Medicare Advantage back to a Medicare Supplement plan after twelve months requires medical underwriting in most states — meaning a decision that seemed easily reversible at 65 may become permanent by 66 if health conditions have developed. Getting the initial choice right, with a clear understanding of what each option provides and what it does not, is the goal of this guide. At Diversified Insurance Brokers, Tonia Pettitt, CMIP©, works with Medicare enrollees across all fifty states to navigate exactly these decisions — comparing plan options, confirming drug formularies, and building a coverage structure that integrates with the broader retirement income plan.
Medicare begins with two foundational parts that every enrollee receives: Part A covers inpatient hospital care, skilled nursing facility stays following a qualifying hospitalization, hospice, and some home health services. Part B covers outpatient medical services — physician visits, specialist consultations, diagnostic testing, preventive services, outpatient surgery, and durable medical equipment. Together these form Original Medicare, and together they leave two significant gaps: Part A has its own deductible per benefit period and coinsurance for extended hospital stays, and Part B leaves the beneficiary responsible for twenty percent coinsurance on all covered outpatient services with no annual out-of-pocket maximum. A catastrophic illness or major surgery under Original Medicare alone can generate tens of thousands of dollars in unrestricted cost-sharing. Every plan decision that follows is fundamentally about how to address these two gaps.
The Two Paths: Medicare Supplement vs. Medicare Advantage
Every Medicare enrollee must choose between two fundamentally different coverage structures. The first path is Original Medicare plus a Medicare Supplement (Medigap) policy plus a standalone Part D prescription drug plan. The second path is Medicare Advantage (Part C), a private plan that replaces Original Medicare and typically bundles hospital, medical, and drug coverage into one policy. These two paths are not interchangeable — they have different cost structures, provider access rules, long-term flexibility characteristics, and financial risk profiles. Understanding the practical difference between them is the foundation of every Medicare plan decision.
Medicare Supplement plans fill the gaps that Original Medicare leaves open. They do not replace Original Medicare — they work alongside it, paying the deductibles, coinsurance, and copayments that Medicare leaves to the beneficiary. Medigap plans are standardized by federal law: a Plan G from one carrier provides exactly the same benefits as a Plan G from any other carrier. The only variables are the monthly premium and the carrier’s service quality and rate stability history. Because Original Medicare itself has no network — any provider who accepts Medicare accepts your coverage — a Medigap enrollee can see any physician, specialist, or hospital in the country that accepts Medicare, without referrals, without network approval, and without pre-authorization for covered services in most cases. This nationwide provider access with no network restrictions is the defining practical advantage of the Medigap path, and it is particularly valuable for retirees who travel, spend time in multiple states, or have existing specialist relationships they want to maintain.
Medicare Advantage plans take a different structural approach. The private plan receives a fixed payment from Medicare for each enrollee and takes on the risk of covering that person’s healthcare costs. Most Medicare Advantage plans operate within defined provider networks — HMO plans typically require using network providers and obtaining referrals; PPO plans allow out-of-network use at higher cost-sharing. Medicare Advantage plans must cap annual out-of-pocket costs — in 2026 the maximum out-of-pocket for Medicare Advantage is $9,250 for in-network care, though plans may set lower limits and PPO plans have separate out-of-network maximums that can be substantially higher. Many Medicare Advantage plans carry low or zero monthly premiums beyond the Part B premium, and many include dental, vision, and hearing benefits not available under Original Medicare. For enrollees who are relatively healthy, comfortable with a local provider network, and prioritize low upfront cost, Medicare Advantage can provide comprehensive coverage at a competitive price point.
Medicare Supplement vs. Medicare Advantage: The Core Trade-Offs
| Factor | Medicare Supplement (Medigap) | Medicare Advantage (Part C) |
|---|---|---|
| Provider access | Any provider who accepts Medicare nationwide — no network, no referrals | Network-based; HMO requires network and referrals; PPO allows out-of-network at higher cost |
| Monthly premium | Part B premium plus Medigap premium ($140–$236/mo for Plan G nationally in 2026) plus Part D premium | Part B premium plus plan premium (often $0 to low); drug coverage typically bundled |
| Out-of-pocket maximum | Plan G: only the $283 Part B deductible annually; Plan N: deductible plus copays; no catastrophic exposure beyond that | $9,250 in-network maximum in 2026; higher if out-of-network services used under PPO |
| Cost predictability | Very high — standardized benefits mean predictable annual exposure | Moderate — copay structures vary, out-of-pocket maximum provides ceiling but annual costs vary |
| Travel and multi-state use | Full coverage anywhere Medicare is accepted — ideal for frequent travelers | Network-dependent; limited coverage outside service area except emergencies |
| Extra benefits (dental, vision, hearing) | Not included — requires separate coverage | Commonly included; quality and scope vary significantly by plan and region |
| Switching flexibility later | Can move to Medicare Advantage at any annual enrollment; Medigap plan changes require underwriting in most states after Open Enrollment Period | Can return to Original Medicare annually; switching to Medigap requires underwriting in most states after first 12 months — may be denied |
Choosing Between Plan G and Plan N: The Most Important Medigap Decision
For Medicare enrollees who became eligible on or after January 1, 2020, Plan G is the most comprehensive Medigap option available — Plan F, which also covered the Part B deductible, is no longer available to new enrollees. Plan G covers every Medicare cost-sharing gap except the annual Part B deductible, which is $283 in 2026. After paying that single annual deductible, a Plan G enrollee has no additional out-of-pocket exposure for any Medicare-covered service for the rest of that calendar year — no coinsurance, no copayments, no excess charges. Plan G nationally commands premiums of approximately $140 to $236 per month depending on age, state, and carrier, making it the plan of choice for enrollees who want maximum coverage predictability and are willing to pay a somewhat higher monthly premium to eliminate cost-sharing uncertainty. Plan G is the most popular Medigap plan, accounting for approximately thirty-nine percent of all Medigap enrollees.
Plan N offers lower monthly premiums — approximately $121 to $219 per month nationally — but introduces two cost-sharing elements that Plan G eliminates. Plan N requires copayments of up to $20 for office visits and up to $50 for emergency room visits that do not result in inpatient admission. More significantly, Plan N does not cover Medicare Part B excess charges — the amount a provider who does not accept Medicare assignment can charge above the Medicare-approved rate, up to a maximum of fifteen percent above the approved amount. In states that ban excess charges (including New York, Pennsylvania, Ohio, Connecticut, Massachusetts, Minnesota, and Rhode Island among others), Plan N’s exposure on this dimension is eliminated. In states where excess charges are permitted, an enrollee on Plan N who uses a provider who does not accept Medicare assignment will face an uncapped fifteen percent additional charge on all services rendered by that provider. The strategic question between Plan G and Plan N is whether the monthly premium savings — typically $20 to $40 per month — outweigh the anticipated copay and potential excess charge exposure over time. For enrollees who anticipate frequent physician visits or who have specialists who do not accept Medicare assignment, Plan G’s comprehensive coverage typically wins. For healthier enrollees in states that ban excess charges, Plan N’s lower premium may represent genuine savings. Our resource on the best independent Medicare broker covers how an independent advisor compares the total annual cost calculation between these two plans for a specific enrollee’s anticipated utilization pattern.
The Open Enrollment Period: The Decision Window That Cannot Be Repeated
The Medigap Open Enrollment Period is the six-month window that begins when an individual is both age 65 or older and enrolled in Medicare Part B. During this period, federal law guarantees the right to purchase any Medigap plan available in the enrollee’s state from any carrier — without medical underwriting, without health questions, and without the ability to be denied or charged a higher premium based on health status. This is the most powerful consumer protection in Medicare enrollment, and it is also the most frequently underutilized. Many enrollees enter their Open Enrollment Period without full awareness of its significance and make initial coverage decisions without comparing the full market of available options.
Once the Open Enrollment Period closes, switching from one Medigap plan to another — or from Medicare Advantage back to a Medigap plan — requires medical underwriting in most states. An insurer can evaluate health history and either decline coverage, charge a higher premium, or impose waiting periods for pre-existing conditions. A 65-year-old in excellent health who enrolls in a Medicare Advantage plan and then develops a significant health condition at 67 may find that returning to a Medigap plan is impossible or prohibitively expensive. This asymmetry — easy to move from Medigap to Medicare Advantage, difficult or impossible to move back — is the single most important structural consideration in the initial Medicare enrollment decision. The Open Enrollment Period is the one moment when health status is legally irrelevant to Medigap enrollment. Our resource on how to get Medicare while working covers the enrollment timing mechanics for individuals whose initial enrollment is delayed by active employer coverage.
Part D Drug Coverage: The Annual Decision Most Enrollees Get Wrong
Medicare Part D prescription drug coverage is a standalone plan for Medigap enrollees and typically bundled within Medicare Advantage plans. Part D plan selection requires examining three variables simultaneously: the plan’s formulary (the list of covered drugs and their tier assignments), the pharmacy network (which pharmacies offer preferred pricing), and the monthly premium. The same medication can be classified as a preferred generic at one carrier’s tier structure — with a low copay — and as a non-preferred brand at another carrier’s tier structure with a dramatically higher cost-sharing requirement. A beneficiary who selects a Part D plan based on monthly premium without verifying their specific medications’ formulary placement and tier assignment may find their drug costs are substantially higher than expected.
Part D carries its own late enrollment penalty for periods without creditable drug coverage — approximately 1% of the national base beneficiary premium per month of unjustified delay, added permanently to the monthly premium. Annual Open Enrollment from October 15 through December 7 allows changes to Part D plans effective January 1. Because formularies change annually, reviewing Part D coverage every year at the Medicare.gov plan finder is essential even for enrollees who are satisfied with their current plan. A drug that was covered at a favorable tier one year may move to a higher tier or be removed from the formulary the following year with no automatic notification. Our resource on Medicare planning articles covers Part D optimization strategies including the pharmacy network and formulary review process in detail.
When Medicare Advantage Makes Sense
Medicare Advantage is the right choice for a specific profile of enrollee, and understanding that profile prevents the mistake of recommending it universally or dismissing it universally. The strongest candidates for Medicare Advantage are enrollees who are relatively healthy at enrollment, comfortable with a defined local provider network that includes their preferred physicians, not planning to travel extensively or spend significant time in multiple states, and motivated by the lower monthly premium structure and the extra benefits — particularly dental, vision, and hearing — that Medigap plans do not include. In markets where high-quality Medicare Advantage plans with strong provider networks and low out-of-pocket maximums are available, Medicare Advantage can provide genuinely comprehensive coverage at a meaningfully lower monthly cost than Medigap plus Part D.
The profile where Medicare Advantage typically underperforms includes enrollees managing significant chronic conditions requiring frequent specialist access, individuals who travel frequently or split time between states, people with established specialist relationships outside a local network, and anyone who places high value on avoiding large potential out-of-pocket events. The $9,250 in-network out-of-pocket maximum in 2026 provides a ceiling — but reaching that ceiling in a high-utilization year still represents a substantial cost burden in retirement. For enrollees who want to understand how their expected healthcare utilization maps to total annual cost under each path, our resource on best Medicare rates and the Medicare calculator support that analysis. Our resource on best-rated Medicare Advantage companies covers the carrier quality and plan availability considerations for enrollees evaluating the Medicare Advantage path in their region.
Integrating Medicare Into the Broader Retirement Financial Plan
Medicare does not operate in financial isolation — it interacts directly with Social Security timing decisions, retirement income strategy, IRMAA income surcharges, and long-term care planning. The Social Security claiming decision affects Medicare IRMAA surcharges through its influence on total retirement income. A household that takes Social Security early and supplements income with annuity distributions may have a different IRMAA exposure profile than one that delays Social Security and draws from retirement accounts in the meantime. Understanding how these income sources interact with Medicare premium calculations is a material element of retirement income planning. Our resource on how Social Security and annuities work together covers this coordination, and our resource on minimizing Social Security taxes addresses the income strategies that reduce taxable income in the years that determine IRMAA tier placement.
Long-term care remains the largest uncovered financial risk under any Medicare plan structure — Original Medicare does not cover custodial care, Medigap does not cover custodial care, and Medicare Advantage does not cover custodial care. The gap between what Medicare provides and what extended care actually costs is a permanent feature of the Medicare program. Our resource on whether Medicare covers long-term care covers this gap explicitly, and our resource on long-term care insurance services covers the planning tools that address it. For enrollees managing supplemental income needs beyond Medicare and Social Security, our resource on annuities for monthly retirement income covers the income floor strategy that eliminates the risk of outliving guaranteed income regardless of healthcare cost trajectory. Our resources on Social Security advice and whether you are leaving Social Security benefits on the table address the benefit maximization decisions that run parallel to Medicare enrollment timing.
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Frequently Asked Questions: How to Choose the Right Medicare Plan
What is the difference between Medicare Supplement (Medigap) and Medicare Advantage?
Medicare Supplement (Medigap) plans work alongside Original Medicare — they do not replace it. Medigap pays the deductibles, coinsurance, and copayments that Medicare leaves to the beneficiary. Because the underlying coverage is Original Medicare, a Medigap enrollee can see any provider who accepts Medicare anywhere in the country, with no network restrictions and no referral requirements. Medicare Advantage (Part C) replaces Original Medicare with a private plan that bundles hospital, medical, and usually drug coverage into one policy. Medicare Advantage plans operate within defined networks — HMO plans require network providers and referrals; PPO plans allow out-of-network use at higher cost-sharing. Medicare Advantage plans must cap annual out-of-pocket costs (maximum $9,250 in-network in 2026) and many include dental, vision, and hearing benefits. The core trade-off is flexibility versus upfront cost: Medigap provides nationwide provider access and highly predictable costs at a higher monthly premium; Medicare Advantage provides lower upfront premiums, potential extra benefits, and a defined cost ceiling, but within a network structure that limits provider choice and geographic flexibility. Our resource on Medicare services provides the full framework for evaluating both paths.
What is the difference between Medicare Supplement Plan G and Plan N?
Plan G and Plan N are the two most widely chosen Medigap options for enrollees who became eligible for Medicare on or after January 1, 2020 (Plan F is no longer available to new enrollees). Plan G covers every Medicare cost-sharing gap except the annual Part B deductible, which is $283 in 2026. After paying that single deductible once per year, a Plan G enrollee has no further out-of-pocket exposure for any Medicare-covered service. Plan G premiums nationally run approximately $140 to $236 per month depending on age, state, and carrier. Plan N carries lower monthly premiums — approximately $121 to $219 per month nationally — but introduces two cost-sharing elements: copayments of up to $20 for office visits and up to $50 for emergency room visits that do not result in inpatient admission, and no coverage for Medicare Part B excess charges (the additional amount, up to 15% above Medicare rates, that a provider who does not accept Medicare assignment can charge). In states that prohibit excess charges, Plan N’s gap is limited to the copays. In states where excess charges are permitted, a Plan N enrollee who uses a non-participating provider will face additional out-of-pocket costs. For enrollees wanting maximum cost predictability, Plan G is the stronger choice. For healthier enrollees in excess-charge-prohibition states who use providers sparingly, Plan N’s premium savings may represent genuine long-term value.
Can I switch from Medicare Advantage back to a Medigap plan later?
In most states, switching from Medicare Advantage back to a Medigap plan after the first twelve months requires medical underwriting — the insurance company can evaluate your health history and decline coverage, charge a higher premium, or impose waiting periods for pre-existing conditions. This is one of the most important structural asymmetries in Medicare enrollment: moving from Medigap to Medicare Advantage is generally unrestricted at each annual enrollment period, but moving back requires passing health screening in most states. A person who enrolls in Medicare Advantage at 65 in good health and then develops a significant health condition may find that returning to a Medigap plan is denied entirely. Three states — New York, Connecticut, and Massachusetts — have enacted guaranteed issue protections that allow enrollees to switch at any time without underwriting, and a small number of other states have partial protections. For most enrollees in most states, however, the initial Medicare enrollment decision carries long-term consequences that should be evaluated with that reality in mind. During the Medigap Open Enrollment Period — the six-month window beginning when you enroll in Part B at or after age 65 — you have guaranteed issue rights to any Medigap plan regardless of health. Outside that window and outside the guaranteed issue states, health matters.
When should I enroll in Medicare Part D prescription drug coverage?
Part D enrollment should happen when you first become Medicare-eligible unless you have creditable drug coverage from another source — active employer group health coverage that meets Medicare’s creditable coverage standard, TRICARE for Life, or certain other qualifying coverage. If you have a Medigap plan, you need a separate standalone Part D plan because Medigap plans do not include drug coverage. Delaying Part D enrollment without creditable coverage triggers a permanent late enrollment penalty of approximately 1% of the national base beneficiary premium per month of unjustified delay, added permanently to your Part D premium. Part D plan selection requires matching your specific medications to each plan’s formulary and tier placement — the same drug can have dramatically different cost-sharing at different carriers. Because formularies change annually, reviewing your Part D coverage each year during Medicare Annual Open Enrollment (October 15 through December 7) is essential even if you are satisfied with your current coverage. A drug moved to a higher tier or removed from the formulary at renewal can significantly increase your out-of-pocket drug costs with no prior notice beyond the annual notice of change document carriers are required to provide. Our resource on Medicare planning articles covers formulary review strategies and how to use the Medicare.gov plan finder for annual drug plan comparison.
What does Medicare not cover that I should plan for separately?
Medicare — under any plan structure — has four permanent and significant coverage gaps that retirees need to address separately. Long-term custodial care (assistance with bathing, dressing, eating, mobility, and toileting) is not covered by Original Medicare, Medigap, or Medicare Advantage. Medicare provides limited skilled nursing facility coverage after a qualifying hospital stay, but custodial care beyond that window is entirely self-funded without long-term care insurance. Routine dental care, vision exams and prescription eyeglasses, and hearing aids are not covered under Original Medicare; some Medicare Advantage plans include limited benefits in these areas but scope varies significantly. Prescription drugs require dedicated Part D or Medicare Advantage coverage — Original Medicare does not cover outpatient prescriptions. And under Original Medicare with Medigap Plan G, the only annual out-of-pocket exposure is the $283 Part B deductible — but without a Medigap plan, the twenty percent coinsurance under Part B has no annual cap, making a serious illness or major surgery potentially very expensive. Our resources on whether Medicare covers long-term care and long-term care insurance services cover the planning tools for the custodial care gap specifically.
What is IRMAA and will my income affect my Medicare premiums?
IRMAA (Income-Related Monthly Adjustment Amount) is a surcharge added to the standard Medicare Part B and Part D premiums for higher-income beneficiaries. For 2026, the IRMAA surcharge begins for individuals with modified adjusted gross income above $109,000 and for joint filers above $218,000. IRMAA is calculated using income from two years prior — so 2026 Medicare premiums are based on 2024 tax return income. For a person retiring in 2026 after a high-earning final working year in 2024, the first year of Medicare premiums may be at an elevated IRMAA tier even though current retirement income is lower. If income has dropped significantly due to a qualifying life event — retirement, divorce, death of a spouse, or loss of income-producing property — you can appeal IRMAA by filing Form SSA-44 with the Social Security Administration to have your premium tier adjusted to reflect current income rather than two-year-old income. IRMAA planning is directly tied to Social Security timing and retirement income structure decisions: the income sources you draw from and in what sequence during the years before Medicare enrollment affect which IRMAA tier your premiums are calculated at. Our resource on minimizing Social Security taxes covers the income sequencing strategies that affect IRMAA alongside Social Security benefit taxation.
What is the Medigap Open Enrollment Period and why does it matter so much?
The Medigap Open Enrollment Period is the six-month window that begins when you are both age 65 or older and enrolled in Medicare Part B. During this period, federal law guarantees you the right to purchase any Medigap plan available in your state from any carrier, without medical underwriting, without health questions, and without the ability to be denied or charged a higher premium based on health status. This is guaranteed issue for Medigap, and it exists only once in most people’s Medicare journey. After this window closes, Medigap plan changes generally require health screening in most states, and insurers can decline you based on pre-existing conditions. The practical implication is that this six-month window is the one moment when your health status is legally irrelevant to Medigap plan selection — making it the optimal time to evaluate all available plans and lock in the best available coverage at the best available rate. Choosing carefully and comparing multiple carriers during this window prevents the situation where a later health change makes your preferred coverage unavailable. Working with an independent Medicare advisor who can compare all available plans from all carriers in your state during this window produces the best outcome. Our resource on the best independent Medicare broker covers what to look for in an advisor for this process.
Should I coordinate my Medicare decisions with my Social Security claiming strategy?
Yes — Medicare and Social Security timing decisions interact in multiple ways that make coordinating them together more valuable than optimizing each in isolation. First, if you are collecting Social Security when you turn 65, Medicare enrollment is automatic — you are enrolled in Parts A and B and must actively opt out of Part B if you are delaying it due to active employer coverage. If you are not yet collecting Social Security at 65, you must actively enroll in Medicare yourself during your Initial Enrollment Period. Second, IRMAA surcharges on Medicare Part B and Part D premiums are based on income from two years prior — and the income level in those years is affected by whether you are drawing Social Security, how much retirement account income you are taking, and whether annuity distributions are part of your income picture. Third, if you delay Social Security past 65, you may be in a period of drawing down retirement accounts to cover living expenses, which increases taxable income and potentially elevates your IRMAA tier. A coordinated plan that sequences retirement account withdrawals, Social Security claiming, and Medicare enrollment together typically produces better combined outcomes than each decision made independently. Our resources on how Social Security and annuities work together and Social Security advice address this coordination framework in detail.
About the Author:
Tonia Pettitt, CMIP©, is a seasoned Medicare specialist with more than 40 years of hands-on experience guiding individuals and families through the complexities of Medicare planning. As a senior advisor with the nationally licensed independent agency Diversified Insurance Brokers, Tonia provides clear, dependable guidance across all areas of Medicare—including Medicare Advantage, Medicare Supplement (Medigap), and Part D prescription coverage. Leveraging active contracts with dozens of highly rated insurance carriers, she helps clients compare options objectively and secure the most suitable coverage for their health and budget.
Known for her patient, education-first approach, Tonia has built a reputation as a trusted resource for retirees seeking reliable, unbiased Medicare support. With four decades of experience across evolving Medicare laws, carrier changes, and plan structures, she brings unmatched insight to every client conversation—ensuring clients feel confident, protected, and fully prepared for each stage of their retirement healthcare journey.
Explore More Medicare Options: Browse our complete guide to Enroll in Medicare at 65 — covering when to sign up, avoiding penalties, open enrollment, switching plans & key deadlines.
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