How often do Medicare supplement rates change?

Most carriers file rate adjustments once per year, but some file twice. Your increase typically takes effect on your policy anniversary date or the carrier's scheduled adjustment date. You can receive a rate increase notice at any time during the year.

Why is my Medicare supplemental insurance going up?

Three factors drive increases: your pricing model (attained-age, issue-age, or community-rated), medical inflation affecting claims costs, and the loss ratio within your specific block of policyholders. When age-based increases and block increases stack together, 10-18% jumps in a single year are not unusual.

Can I switch Medicare supplement plans without medical underwriting?

Outside of your initial Medigap Open Enrollment Period, most states require medical underwriting to switch plans. However, certain federal guaranteed issue triggers apply, such as losing employer coverage or a carrier leaving your area. NJ has specific state rules that may offer additional protections. Call to confirm your options.

Does the letter plan affect my rate increase?

Plan G from one carrier covers the exact same benefits as Plan G from another. The benefits are standardized by Medicare. What differs is the carrier's pricing strategy and long-term rate stability. Some carriers price low to attract new members, then raise rates sharply once the block ages.

Why Did My Medicare Supplement Rate Change? The Three Factors Behind Every Increase

Why did my Medicare supplement rate change? That question hits your inbox or mailbox, and the letter rarely explains much. You deserve a clear answer, not a form letter with fine print.

I'm Anthony Orner, a licensed Medicare broker in New Jersey. Here's what's actually behind that number going up.

Call for Free Advice — 855-559-1700

Attained-age vs. issue-age vs. community-rated pricing explained

Your pricing model determines the biggest chunk of future increases. Most Medigap policies in the U.S. use one of three structures:

Attained-age: Your premium rises automatically as you get older. This is the most common model and the one that surprises people most at 72, 78, or 83.
Issue-age: Your rate is based on the age you were when you bought the policy. It can still increase for inflation, but age alone won't push it up.
Community-rated: Everyone pays the same base rate regardless of age. Rate changes still happen, but they apply equally across the pool.

The starting premium isn't the real cost. What you pay at 75 matters more than what you pay at 65.

Medical inflation and carrier loss ratios drive annual adjustments

Even issue-age and community-rated plans aren't immune to increases. When healthcare costs rise across the board, carriers file for rate adjustments with your state's insurance department.

Loss ratio is the key metric. If claims paid out by your carrier's block of policyholders exceed projections, the entire block shares that cost. This has nothing to do with your personal health or claims history. It's about the pool you're in.

When age increases and block increases stack together

Here's what catches people off guard: these factors compound. An attained-age bump of 4-5% plus a block increase of 8-12% can mean a 15-18% jump in a single year.

Some carriers price aggressively low to attract new members, then raise rates sharply once the block ages and claims rise. The carrier matters more than the letter plan. Plan G benefits are standardized by Medicare. Long-term premium behavior is not.

NJ rate filing data: which carriers raised rates the most in 2025

In 2025, several major carriers filed Plan G and Plan N increases ranging from 15% to just under 20% in New Jersey. These weren't small annual adjustments. They caught a lot of people off guard.

NJ rate filings are public record through the state Department of Banking and Insurance. I track them so my clients don't have to. When I see a carrier trending toward aggressive increases, we talk options before the next notice arrives.

Steps to take within 30 days of receiving a rate increase notice

Don't panic, but don't ignore it. A rate increase notice is your signal to review, not just accept.
Compare current rates across carriers. Since benefits are standardized by letter plan, switching carriers can save you real money. Rates vary by carrier.
Understand underwriting requirements. Outside your initial Medigap Open Enrollment Period (6 months starting the month you're 65+ and enrolled in Part B), most switches require medical underwriting. Some federal guaranteed issue triggers may apply.
Call for a free rate review. I'll pull current rates from multiple carriers and show you exactly where you stand.

A free rate review takes 10 minutes

You don't need to wait for open enrollment. You don't need to fill out a form. Call me at 855-559-1700 and I'll pull your current plan details, compare rates across carriers available in your area, and tell you honestly whether switching makes sense or staying put is the better move.

No pressure. Just clarity on what that letter actually means.

Get a straight answer about your rate increase.

Call 855-559-1700 for a free rate review with Anthony Orner.

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