Medicare Advantage Tradeoffs for Affluent Retirees

Why do the Medicare Advantage plans with the lowest premiums sometimes cost the most when it matters? Because the price you see at enrollment isn’t the price of being seriously ill on the plan. Advantage trades a low or zero premium today for network walls and approval gates you only notice when you actually need care.

The two roads

When you turn 65 you pick one of two paths. Original Medicare plus a Medigap supplement and a drug plan, or Medicare Advantage (Part C), a private plan that bundles everything into one product, often with a $0 premium and extras like dental and gym memberships.

On paper, Advantage wins the brochure. Lower premium, more perks, one card. That’s exactly why it’s worth slowing down and asking what you’re trading away.

What the low premium is buying

Three things, mostly.

Networks. Advantage plans work through a defined network of doctors and hospitals. If you want a specific surgeon at a specific cancer center, you need them in network, and networks change year to year. Original Medicare plus Medigap is accepted almost anywhere in the country that takes Medicare, which is most places.

Prior authorization. Advantage plans can require approval before they’ll cover many procedures, scans, and stays. That’s a gate between you and care, run by the insurer, exactly when you’re least able to fight it. Original Medicare uses far less of this.

Geography. Advantage is usually local. Spend winters in Florida and summers in New York, or travel widely, and a local network gets thin fast. Original Medicare travels with you.

The pattern is the same one I see across finance. The cheap option is cheap because it shifts risk onto you, and the risk only shows up in the bad state of the world.

Why this hits affluent households differently

For someone with $3M or more, the monthly premium difference between Advantage and a Medigap plan is rounding error. A few hundred dollars a month is not the variable that should drive this decision. Access is.

If you can comfortably afford a Medigap Plan G premium, you’re buying the freedom to walk into nearly any hospital in the country and the freedom to skip the prior-authorization fight. For a household that can self-fund the premium with ease, paying for unrestricted access to the best specialists is usually the better trade. You’re not optimizing for the cheapest plan. You’re optimizing for the call you’ll make at 80 when the diagnosis is serious.

The trap door

Here’s the second-order problem most people miss. Switching from Advantage back to Original Medicare with a Medigap supplement later can require medical underwriting, which means a health condition can raise your price or lock you out of Medigap entirely.

So the easy choice at 65, the free-looking plan, can quietly become a one-way door. You can get in cheaply. Getting back out, after you’ve developed the conditions that make Medigap valuable, is the expensive part.

Medicare Advantage isn’t a bad product. It’s a bet that you’ll stay healthy and local. If you can afford to not place that bet, think hard before you do.