Medicare Supplement

Is Your Medigap Priced by Age or by ZIP? Why It Matters

Is Your Medigap Priced by Age or by ZIP? Why It Matters — plain-language Medicare information for East Lansing, Michigan.

EAST LANSING, Mich. — If you've ever opened a renewal notice for a Medicare Supplement policy and wondered why the premium went up when the benefits didn't budge, you're not alone. Medigap benefits are standardized by letter — Plan G is Plan G, whether you bought it last year or ten years ago — but the price you pay can drift upward over time. The reason usually comes down to one of three pricing methods insurers use to set that premium in the first place.

Understanding which method is behind your policy is one of the more useful things a Medigap shopper can do, and it's rarely spelled out on the front of a brochure.

Benefits are frozen. Prices are not.

Medigap plans sold today follow federal standardization rules. That means a Plan G from one company covers the same gaps in Original Medicare as a Plan G from another company. What differs is the premium — and whether that premium changes as you get older.

Three things generally push a Medigap premium up over time: general inflation in health care costs, the insurer's claims experience (how much the company is paying out on that block of policies), and, for some pricing methods, your age. Benefits staying the same does not mean the price stays the same.

Method 1: Community-rated (also called "no-age-rated")

With a community-rated policy, everyone who buys the same plan from the same company in the same area pays the same base premium, regardless of age. A 68-year-old and an 80-year-old are quoted the same starting rate.

The premium can still increase over time because of inflation and claims experience — it just won't go up simply because you had another birthday.

Method 2: Issue-age-rated

With an issue-age-rated policy, your premium is based on the age you were when you first bought the policy. Buy in at 65, and your rate is anchored to age 65. Buy in at 72, and it's anchored to 72.

Your premium won't rise because you're getting older, but — as with every method — it can still climb due to inflation and the insurer's overall costs.

Method 3: Attained-age-rated

Attained-age policies are priced on your current age. The premium usually starts lower at 65 and then steps up as you age, in addition to any inflation-driven increases. Over a long retirement, those age-based bumps can add up meaningfully.

None of the three methods is automatically "better." The right fit depends on your age today, how long you plan to keep the policy, your budget, and what's actually available where you live.

What's available in Michigan

Which pricing methods are offered depends on the insurer and on state law. Some states require community rating; others allow any of the three. Michigan does not mandate a single method, so shoppers in East Lansing — which sits in Ingham County — may see policies priced all three ways from different carriers.

Before you enroll, ask the agent or the insurer, in writing, which pricing method applies to the specific policy you're considering. It's a fair question, and the answer shapes your renewal notices for years.

When you can switch — and when you can't

Federal rules give you a one-time, six-month Medigap Open Enrollment Period that begins the month you're 65 or older and enrolled in Part B. During that window, insurers can't turn you down or charge more based on health.

Outside that window, in most states, insurers can use medical underwriting when you apply for a new Medigap policy. That means switching later — say, from an attained-age policy to a community-rated one — isn't always guaranteed. It's worth checking Michigan's current rules with MMAP, the state's free SHIP counseling program, before making a move.