Why Your Zip Code and Birthday Both Affect What You Pay
A 65-year-old woman in Florida can pay twice what her sister in Missouri pays for the exact same Plan G coverage. Same benefits. Same Medicare rules. Completely different bill. That gap isn’t random, and once you understand what’s behind it, you’ll be in a much better position to shop smart.
Medicare supplement insurance — also called Medigap — is federally standardized, which means a Plan G from Aetna covers the same things as a Plan G from Mutual of Omaha. What’s not standardized is what you pay for it. Insurers set their own premiums, and state insurance commissioners decide what rules insurers have to follow. The result is a pricing landscape that’s all over the map. Literally.
I’ve spent years helping people sort through this, and the single biggest mistake I see is people assuming Medigap is priced the same everywhere. It’s not. Let me show you what’s actually going on.
The Three Pricing Methods Insurers Use — and Why They Matter More Than You Think
This is the part most people skip, and it costs them. There are three ways insurers can price Medigap policies, and which method your insurer uses will affect what you pay not just today, but ten years from now.
Community-rated: Everyone in the plan pays the same premium regardless of age. A 65-year-old and a 78-year-old pay the same base rate. Premiums still go up over time due to inflation and claims experience, but your age itself isn’t the driver. This is generally the best deal if you’re buying in your late 60s or beyond.
Issue-age-rated: Your premium is locked to the age you were when you first enrolled. Buy at 65, pay the 65-year-old rate forever (adjusted for inflation, but not for aging). This is solid. You’re rewarded for buying early.
Attained-age-rated: Your premium goes up every year as you get older, on top of general rate increases. This is the most common method insurers use, and it’s the one that tends to bite people in their 70s. Your rate at 75 can be dramatically higher than what you signed up for at 65.
States get to decide which methods insurers can offer. A handful of states restrict or heavily regulate which pricing methods are allowed. In my experience, people almost never ask which pricing method applies when they’re shopping. They should.
How State Rules Create Dramatic Price Differences
Some states go further than the federal baseline and impose their own Medigap rules. This changes both what’s available and what you’ll pay.
Massachusetts, Minnesota, and Wisconsin are the three states that have always operated under their own standardized Medigap systems, different from the federal framework that other states use. They don’t use Plan letters at all — they have their own plan structures. If you live in one of these states, the shopping process looks different, so factor that in.
New York and Connecticut require insurers to use community rating and to accept Medigap applicants year-round regardless of health status. That sounds great, and for people with health conditions it genuinely is. But it also means younger, healthier enrollees subsidize older, sicker ones, which tends to push base premiums higher. A 65-year-old shopping for Plan G in New York might pay $250 or more per month, where the same plan in a Midwest state might run $110 to $140.
Here’s a snapshot of what Plan G premiums roughly look like at age 65 across different states as of 2026:
| State | Approximate Plan G Monthly Premium (Age 65) | Pricing Environment |
|---|---|---|
| Iowa | $100 – $130 | Competitive, attained-age common |
| Ohio | $110 – $145 | Competitive, multiple carriers |
| Texas | $130 – $175 | Larger market, wide price range |
| Florida | $155 – $210 | High utilization, older population |
| New York | $240 – $310 | Community-rated, guaranteed issue |
| California | $140 – $195 | Large market, attained-age dominant |
These are ballpark figures. Your actual quote will vary based on your specific age, the carrier, and where exactly in the state you live. But the point stands: state matters enormously.
How Age Affects Your Rate — and When to Lock In
In most states, your age at the time you enroll sets a baseline, and then that rate climbs as you get older under attained-age pricing. What this means practically is that waiting to enroll almost never works in your favor.
Your open enrollment window for Medigap begins the month you turn 65 and are enrolled in Medicare Part B, and it lasts six months. During this window, insurers cannot deny you coverage or charge you more because of a health condition. Once that window closes, most states allow insurers to use medical underwriting. If you have diabetes, heart disease, cancer history, or even something as common as sleep apnea, you could be denied or charged more. I’ve talked to people who waited two or three years past 65 to buy Medigap and then couldn’t get approved for anything other than high-risk coverage.
That said, if you’re in a state like New York or Connecticut where guaranteed issue applies year-round, the calculus is different. You have flexibility. You can wait, compare, and switch without the same risk. But in most states, you don’t have that luxury, so buying during your initial enrollment window is almost always the right call.
One more thing on age: a 67-year-old in Ohio shopping for Plan G today, outside of their open enrollment period, might find that only a couple of carriers will take them at standard rates. Get quotes early, before you think you need to.
The Common Mistake: Assuming the Cheapest Premium Wins
I see this constantly. Someone finds the lowest premium in their state, signs up, and thinks they’ve done a great job. Sometimes they have. But there are a few things that make the lowest-rate plan not actually the best deal.
First, carrier rate history matters. Some insurers enter a market with low introductory rates to attract enrollees, then raise premiums aggressively after a few years. In most states, once you leave a plan and want to come back — or switch to a different carrier — you lose your guaranteed issue rights and have to go through underwriting again. If your health has changed, you could be stuck with a carrier whose rates are spiraling upward.
Second, the 2026 Medicare Part B deductible is $257. Plan G covers everything except that deductible. High-Deductible Plan G makes you pay $2,870 in out-of-pocket costs before coverage kicks in. The regular Plan G premium might be $145 per month versus $55 for the high-deductible version. That’s $1,080 in annual premium savings, but you’re on the hook for up to $2,870 before benefits apply. For a healthy 65-year-old who rarely uses healthcare, the high-deductible version might actually be smarter financially. For someone managing chronic conditions and seeing specialists regularly, it probably isn’t.
Third, not all insurers are equally responsive or easy to work with when you have a claim dispute or billing problem. That’s harder to quantify, but it’s real. I generally recommend sticking with carriers that have been in the Medigap market for a long time and have strong financial ratings from AM Best (A or higher).
Bottom Line
For most people in most states, buying Plan G during your Medigap open enrollment window at 65 is the right move — don’t wait and don’t assume you’ll have better options later. Get quotes from at least three or four carriers in your state, ask which pricing method they use, and look up their rate increase history before you commit. If you’re in a community-rated state like New York, you have more flexibility, but you’ll pay more up front regardless of when you enroll.
Frequently Asked Questions
Can I switch Medigap plans if I find a cheaper rate in my state?
In most states, yes — but you’ll face medical underwriting when you apply for the new plan outside of your open enrollment window. If you have any significant health conditions, you could be denied or charged a higher rate. In New York and Connecticut, you can switch without underwriting restrictions. Always check your state’s rules before assuming you can freely shop around.
Why is Plan G so much cheaper in some states than others?
Several factors drive it: local healthcare costs, how often people in that area use medical services, how competitive the insurance market is, and what regulations the state imposes on insurers. Florida, for example, has an older population that uses more healthcare, so insurers price accordingly. Iowa has lower utilization and a more competitive market, so premiums are lower.
Do Medicare supplement rates go up every year no matter what?
Almost always, yes. Even in community-rated states where your age doesn’t drive increases, insurers still raise premiums over time based on overall claims costs and inflation. The difference is whether your age is an additional factor on top of those general increases. Under attained-age pricing, you’re getting hit by both aging and general inflation simultaneously.
I’m turning 65 and already have employer coverage. Should I delay Medigap enrollment?
If your employer coverage is genuinely good, staying on it while you’re still working can make sense. The key is understanding your Medigap special enrollment rights when that employer coverage ends. You’ll have a guaranteed issue window tied to that loss of coverage, which protects you. What you don’t want to do is drop employer coverage, go without Medigap for a year or two, and then try to buy in later without a qualifying event. Talk to a licensed agent in your state before making that call.
