By SFMG Wealth Advisors | Guest Contributor
For many Americans, turning 65 feels like the finish line of a long healthcare race. After years of managing employer plans and paying premiums, Medicare arrives like a well-earned reward. But for those who treat it as a complete solution, a costly surprise often follows. The reality is that Medicare, even when combined with supplement coverage, leaves meaningful gaps that can significantly affect your financial plan.
A System Built in Layers
Medicare is not a single plan. It is a system of parts, each designed to address a different category of health care needs, and the decisions you make about combining them will shape your coverage and cost throughout retirement.
Part A covers hospital stays, skilled nursing facility care, hospice, and some home health services. For most, it carries no monthly premium, provided you or your spouse paid Medicare for at least 10 years through payroll taxes. Enrolling at 65 is almost always the right first step, even if you are still working.
Part B covers outpatient care, physician visits, preventive services, and medically necessary supplies. Unlike Part A, it requires a monthly premium. If you are already receiving Social Security at 65, that premium is deducted automatically. If not, you will need to enroll proactively and missing that window can result in lasting penalties.
From here, a decision opens up. You can remain in original Medicare, built on Parts A and B, or move to Part C, Medicare Advantage, offered through private insurers approved by Medicare. These plans bundle Parts A and B and often include extras like vision, dental, and hearing benefits, with many folding in prescription drug coverage. Premiums, networks, and plan rules vary significantly, so this option rewards careful comparison.
For those who stay in Original Medicare, Part D fills the prescription drug gap through a standalone private plan. Formularies and out-of-pocket costs differ across plans, and it is worth revisiting your selection each year during open enrollment, particularly if your medications change.
What the system still leaves out
Even a well-constructed Medicare plan has meaningful exclusions. Routine dental care, vision exams, hearing aids, and long-term care sit entirely outside Original Medicare. Beyond outright exclusions, Original Medicare leaves room for significant cost-sharing through deductibles, coinsurance, and copayments, with no annual out-of-pocket maximum. A serious illness or prolonged hospital stay can generate ongoing expenses that are difficult to predict and harder to absorb.
The Case for a Medigap Policy
This is where Medicare Supplement plans, commonly called Medigap, enter the picture. Medigap does not replace Medicare or expand what it covers. What it does is absorb the cost-sharing burden that Original Medicare leaves behind, covering deductibles, coinsurance, and copayments that would otherwise come directly out of your pocket.
Medigap is not without its own constraints. It does not cover prescription drugs, dental, vision, or hearing. Each policy covers only one individual, so couples need separate plans. Premiums vary by plan type, insurer, and state. Even so, for many retirees the predictability it brings to out-of-pocket costs is worth the premium.
Where the Real Planning Gap
Beyond the mechanics of Medicare, the more consequential gaps tend to be planning gaps, the places where assumptions outpace reality.
The first long term gap: Neither Original Medicare nor Medigap covers custodial long-term care, the extended assistance with daily living that many Americans will eventually need. According to the U.S. Department of Health and Human Services, a majority of people turning 65 today will require some form of long-term care in their lifetime. This is one of the largest uninsured risks in retirement, and one frequently underestimated until it is too late to address affordably.
The second is the income gap: Higher-income beneficiaries pay more for Parts B and D through the Income-Related Monthly Adjustment Amount, known as IRMAA. A single year of elevated income from a Roth conversion, a business sale, or a large distribution can trigger a premium surcharge that catches many retirees off guard. Proactive income planning in the years surrounding Medicare enrollment can help manage this exposure.
The third is the enrollment timing gap: The seven-month Initial Enrollment Period surrounding your 65th birthday is not flexible. Missing it can result in permanent premium penalties and delayed coverage. For those not yet receiving Social Security, enrollment does not happen automatically and requires deliberate action well ahead of that birthday.
A Coordinated Approach
At SFMG Wealth Advisors, we are not just wealth advisors. We are the team that get invited to your retirement parties, the ones you call when a big life change is on the horizon, and the familiar faces you trust to help navigate whatever comes next. Founded in 2002 and locally owned, we are a Dallas-based, fee-only Registered Investment Advisor serving high-net-worth families, business owners, executives, and private equity investors. As fiduciaries, we are required to act in our clients’ best interest, and our mission is simple: to help provide you with Confidence for Life.
Healthcare coverage in retirement is not a single decision. It is an ongoing coordination of Medicare parts, supplement policies, prescription drug plans, and long-term care strategies that evolves as your health and financial situation change. SFMG helps our clients coordinate these elements with their overall wealth plan, working closely with their Medicare counselor, insurance advisor, and tax professional to optimize coverage and minimize costs.
You can find additional information about Medicare at www.Medicare.gov
ABOUT THE AUTHOR: This article was prepared by SFMG Wealth Advisors, an SEC-registered investment adviser (RIA), and published as part of a paid content marketing arrangement with Good Life Family Magazine. The views expressed are solely those of SFMG Wealth Advisors and do not represent the views of Good Life. This is a marketing communication intended to inform readers about SFMG Wealth Advisors and its services, and reflects information believed to be current as of the date of publication; the overview of Medicare structures and data is current as of September 2026. SEC registration does not imply a certain level of skill or training, and investing involves risk, including the possible loss of principal.
The information provided is for general educational purposes only and does not constitute individualized investment, tax, legal, or healthcare advice. Medicare rules, plan availability, premiums, and enrollment requirements are subject to change and may vary based on individual circumstances. SFMG is not a licensed insurance agent, CPA firm, or healthcare provider. Always consult a licensed Medicare counselor, qualified insurance professional, and your own tax and legal advisors regarding your specific situation.
A copy of SFMG Wealth Advisors’ Form ADV Part 2A is available upon request or at www.sfmg.com/resources.