I’ve been helping my own parents and dozens of clients navigate Medicare for over a decade, and the sheer confusion around Medicare Supplement Plans is the first hurdle. Original Medicare (Parts A & B) leaves some pretty massive gaps—think 20% coinsurance on outpatient services with no annual cap. That’s where these plans, also called Medigap, come in. Their entire purpose is to cover what Medicare doesn’t, but they’re not all created equal.
The most comprehensive plan by far is Plan G. It covers nearly every gap: the Part A deductible, the Part B coinsurance, and even Part B excess charges—those extra fees some doctors can legally tack on. For my money, it’s the gold standard for new enrollees. Plan F was the previous top-tier option, but it’s no longer available to people newly eligible for Medicare after January 1, 2020. If you’re already on it, you can generally keep it, but for everyone else, G is the new F.
Here’s the genuine frustration: the industry’s obsession with Plan N as a “budget” alternative drives me a bit nuts. Yes, its premiums are often lower. But you’re trading that for up to $20 copays for some office visits and $50 copays for emergency room visits that don’t result in an inpatient admission. It also doesn’t cover those Part B excess charges, so you could still get a bill. For some healthy folks, that gamble works. For others, the out-of-pocket surprises aren’t worth the monthly savings.
A specific real-world example? A client last year had a series of cardiac tests and specialist visits. With Plan G, her total out-of-pocket was $0 after Medicare paid its share. A neighbor with a similar health issue but on Plan N had over $300 in combined copays for the visits alone. That’s the difference in black and white.
Don’t just look at the letter. You must compare identical plans from different companies. A Plan G from Company A can cost hundreds of dollars more per year than the exact same coverage from Company B. Insurers price these plans based on their own internal models, not on the benefits, which are standardized by the government. Use your state’s Medicare website or work with an independent broker who can pull quotes from multiple carriers.
My strong opinion is that for most people, the peace of mind of a near-total coverage plan like G is worth the premium. Healthcare costs are unpredictable, and that 20% coinsurance with no ceiling on Part B services is a terrifying financial risk. A single major health event can wipe out the premium savings from a skimpier plan in a heartbeat.
There’s a critical, often overlooked limitation with all Medigap plans: they don’t cover prescription drugs. You must buy a separate Part D plan. This is a massive downside because it adds another premium, another set of rules, and another annual enrollment headache. You can’t just assume your medications are covered because you have a great Supplement plan. You have to actively manage both, and the formularies for Part D plans change every single year.
The best time to buy is during your 6-month Medigap Open Enrollment Period. It starts the month you’re both 65 or older and enrolled in Medicare Part B. During this window, insurers can’t deny you coverage or charge you more due to pre-existing conditions. Miss that window, and applying later becomes medical underwriting—they can look at your health history and say no or charge a fortune. I’ve seen people in their 70s with minor conditions get declined or quoted premiums double the standard rate.
One final, slightly provocative thought: for all the talk about choosing the perfect plan, your health in your mid-60s is a terrible predictor of your needs at 80, and locking in the most comprehensive coverage you can afford early is often the cheapest long-term play.
