Medicare at 65: One Six-Month Decision That Costs $32,000 if You Get It Wrong

A Medicare beneficiary who delays buying Medigap until after the initial six-month period after enrolling in Part B at age 65 can face medical underwriting. During the window, insurers must offer Medigap plans at standard rates without health questions. After the window, many states allow carriers to deny coverage or charge higher underwritten premiums based on health history. A later diagnosis such as diabetes, a stent, or cancer history can lead to denial or surcharges for the same plan that others receive at standard rates. The resulting premium increases can create large lifetime costs, potentially tens of thousands over retirement.

"Age: 65, newly enrolled in Medicare Part B Guaranteed-issue window: 6 months starting the month you turn 65 and enroll in Part B Standard Plan G premium: $150 to $220 per month Underwritten premium after the window: $230 to $330 per month, a 30% to 50% surcharge Avoidable lifetime cost: roughly $1,600 a year, or about $32,000 over a 20-year retirement"

"During those six months, insurers must sell you any Medigap plan they offer at the standard rate with no health questions. Miss it, and most states allow carriers to medically underwrite. A diabetes diagnosis, a stent, or a cancer history can mean a flat denial or a surcharged premium for the same policy your neighbor pays standard rates on."

"The math is unforgiving because healthcare inflation runs hot. Premium surcharges compound against that backdrop, and household savings rates have slipped, leaving retirees with less cushion to absorb a $100-a-month mistake that lasts two decades."

"Buy Plan G during the open enrollment window, even if you feel fine. Plan G is the most widely sold supplement because it covers nearly everything except the Part B deductible. You lock in guaranteed renewability for life."

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