Your Medigap Premium Will Not Stay the Same — Ever
Most people shopping for a Medicare supplement plan assume their premium is basically locked in once they enroll. It’s not. In fact, one of the most expensive surprises in retirement healthcare is watching a $120/month Medigap premium slowly become $280/month by the time you’re in your late 70s. That’s not a scare tactic — that’s just how the pricing works.
There are a few different reasons your premium climbs over time, and they don’t all get equal attention. Age increases are the big one. But there’s also general medical inflation, insurer-specific rate adjustments, and the rating method your plan uses. Understanding all four is the difference between making a smart long-term choice and getting blindsided.
I’ve helped a lot of people work through this, and I’ll tell you right now: most of the confusion comes from not knowing which type of rate increase is actually hitting them. So let’s break it down clearly.
The Three Pricing Methods Determine How Much Age Hurts You
Every Medigap policy uses one of three “rating” methods to set its premiums. This is the single most important thing to understand before you buy a plan, because it determines exactly how your costs will grow as you age.
Community-rated plans charge the same premium to everyone in the policy, regardless of age. A 65-year-old and a 75-year-old on the same plan from the same insurer pay the same monthly amount. These plans still go up over time because of inflation and medical trend factors, but your individual age doesn’t directly increase your rate. If you can find one, this is generally the best deal as you get older.
Issue-age-rated plans base your premium on how old you were when you first bought the policy. Your rate is locked to that entry age, so the 65-year-old pays less than someone who enrolled at 70 — but your age at 72 or 75 doesn’t directly jack up your rate. Like community-rated plans, these still increase for inflation, but not because you had a birthday.
Attained-age-rated plans are the most common, and in my opinion, the most problematic for people who don’t understand what they’re signing up for. Your premium is based on your current age, and it goes up every year as you get older. These plans often look the cheapest at 65, which is exactly why insurers love selling them. But by 72, 75, or 80, you’re paying a lot more than you would under a community-rated plan.
Here’s a simplified comparison of how these three methods play out over time for the same Plan G coverage:
| Age | Community-Rated (est.) | Issue-Age-Rated (est.) | Attained-Age-Rated (est.) |
|---|---|---|---|
| 65 | $160/mo | $140/mo | $120/mo |
| 70 | $175/mo | $155/mo | $165/mo |
| 75 | $195/mo | $175/mo | $215/mo |
| 80 | $215/mo | $195/mo | $275/mo |
These are estimates based on typical market patterns, not quotes from a specific insurer. But the trend is real. The attained-age plan that looked $40 cheaper at 65 costs $60 to $80 more per month by 80. Over 15 years, you’ve paid thousands more than the community-rated plan that seemed pricier upfront.
Age Increases Are Just One Layer — Medical Inflation Hits Everyone
Here’s something that trips people up: even if you’re on a community-rated or issue-age-rated plan, your premium is still going up every year. It’s not because you’re older. It’s because healthcare costs more every year, your insurer paid out more in claims, and they need to recapture that through higher rates.
These are called “trend increases,” and they typically run 3% to 6% per year depending on the insurer and the state. On top of that, if you’re on an attained-age plan, you’re absorbing your age increase on top of the trend increase. Those two numbers stack.
A 68-year-old in Ohio on an attained-age Plan G might see a 4% trend increase plus a 3% age bump in the same year. That’s a 7% rate hike in 12 months. And because the insurer doesn’t have to split those out on your rate notice, it just looks like one big jump with no explanation.
States do have some oversight of rate increases. Insurers have to justify their requested hikes to state insurance departments, and increases can be denied or reduced. But in practice, most increases go through. Some states have more aggressive consumer protections than others. New York and Connecticut, for example, only allow community-rated Medigap plans, which removes the age component entirely.
The Biggest Mistake People Make When Shopping for Medigap
I see this constantly, and it costs people real money: choosing a Medigap plan based only on the current monthly premium without asking what rating method the insurer uses.
I understand why it happens. You’re comparing quotes, everything looks like a commodity, and the $25/month difference between two Plan G policies feels like an obvious choice. But if the cheaper plan is attained-age-rated and the more expensive one is community-rated, that “savings” almost certainly disappears within four or five years.
Worse, by the time those rates have diverged significantly, you may not be able to switch. Outside of your initial enrollment window, Medigap insurers can medically underwrite you in most states. That means if you’ve been diagnosed with anything significant in the years since you first enrolled, you might be locked into your current plan whether you like it or not.
The only guaranteed time to switch plans without medical questions is during your Medigap Open Enrollment Period, which is the six months that start the month you turn 65 and are enrolled in Medicare Part B. After that window closes, you’re subject to underwriting in most states, and a lot of insurers will decline coverage or add riders that exclude pre-existing conditions.
This is why it matters so much to think about the 15-year picture when you’re 65, not just what you’re paying this month.
What You Can Actually Do to Control Long-Term Costs
You’re not completely powerless here. There are a few real strategies that work.
First, find out the rating method before you buy. Ask the insurer directly or ask your broker. It should be disclosed in the policy documents. If someone can’t tell you, that’s a red flag.
Second, compare insurers, not just plan letters. Plan G from Insurer A covers the exact same things as Plan G from Insurer B. The coverage is standardized by federal law. The only differences are price, rate history, and the company’s financial stability. Look up rate increase history. Some brokers have access to this data. Ask.
Third, consider high-deductible Plan G if you’re in good health. The 2026 deductible for high-deductible Plan G is $2,870. If you meet that deductible, it pays the same things as regular Plan G after that point. Premiums are often 50% to 60% lower, and the age-related increases, while they still exist, are applied to a much smaller base number. A 67-year-old in decent health paying $55/month for high-deductible Plan G is in a very different position than someone paying $145/month for standard Plan G.
Fourth, if you’re in a state with community-rated rules, pay attention to that. In New York, for instance, your premium doesn’t go up because you got older. Inflation increases still happen, but you’re not penalized purely for aging. That’s a meaningful structural advantage.
One thing I’ll say clearly: don’t drop your Medigap plan to save money on premiums without thinking this through very carefully. Original Medicare alone exposes you to the Part A deductible (which is $1,676 per benefit period in 2026), 20% of all Part B costs with no out-of-pocket maximum, and potentially crushing costs if you’re hospitalized multiple times in a year. The premium feels expensive until you’re faced with what Medigap actually covers.
Bottom Line
If you’re choosing a Medigap plan at 65, don’t optimize for the lowest premium today. Look at the rating method, look at the insurer’s rate increase history, and think about where you’ll be financially at 75 or 80 when healthcare costs tend to go up. For most people, a community-rated or issue-age-rated Plan G from a financially stable insurer is the smarter long-term choice, even if it costs a bit more upfront.
Frequently Asked Questions
Do Medicare supplement premiums go up every year?
Yes, in practice they do for nearly everyone. Whether it’s an age-based increase, a general trend increase from rising healthcare costs, or both, you should expect your premium to be higher next year than it is today. The only question is how much, and that depends heavily on which rating method your plan uses and which state you live in.
Can I switch Medigap plans if my premiums get too high?
Maybe, but not always. Outside of your initial open enrollment period, most states allow insurers to ask medical questions and deny coverage based on your health history. If you’re healthy, switching is often possible and can save you money. If you’ve developed health conditions since you first enrolled, you might not qualify for a different plan. This is exactly why it matters to choose wisely at 65 rather than assuming you can always switch later.
What’s the average rate increase for Medigap plans per year?
There’s no single national average that covers all plans and all insurers, but a reasonable expectation for most attained-age-rated plans is 4% to 8% per year when you combine age increases and medical trend. Community-rated and issue-age-rated plans tend to run lower, typically in the 3% to 5% range for trend alone. Actual increases vary by state and insurer, which is why checking a specific company’s rate increase history before you buy is worth doing.
Does Plan G premium increase with age more than other Medigap plans?
Not necessarily more than other plans, but Plan G is one of the most popular options, so it gets the most attention. Any Medigap plan using attained-age rating will see age-based increases. The plan letter itself (G, N, etc.) doesn’t determine how aggressively rates increase. The rating method and the insurer’s business decisions do. That said, Plan N often starts cheaper and can be a reasonable alternative for people willing to pay some cost-sharing in exchange for lower long-term premiums.
