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HomeMedicare SupplementCaliforniaFontanaThe Three Ways Medigap Is Priced — and Why Yours Can Go Up

Medicare Supplement

The Three Ways Medigap Is Priced — and Why Yours Can Go Up

# The Three Ways Medigap Is Priced — and Why Yours Can Go…

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Thoughtful older woman at window in Fontana — illustrating this Medicare guide
Photo: LOGAN WEAVER | @LGNWVR Photo by LOGAN WEAVER | @LGNWVR on Unsplash

Key takeaways

  • Medigap benefits are standardized by law, but premiums are set by each insurance company using one of three pricing methods.
  • The three methods are community-rated, issue-age-rated, and attained-age-rated — and each ages differently over time.
  • Even when benefits stay the same, premiums can rise because of inflation, medical claims, and (in some cases) your age.
  • Which methods are offered depends on the insurer and your state; Fontana residents can compare options at Medicare.gov or through California's SHIP program (HICAP).

FONTANA, Calif. — If you have a Medicare Supplement (Medigap) policy, or you're shopping for one, you may have noticed something confusing. The benefits in a Medigap plan are standardized by the federal government and cannot change. Yet the premium you pay for that plan can — and often does — go up over time.

The reason lies in how insurers are allowed to price these policies. There are three main methods, and knowing which one applies to your policy can help you understand why your bill looks the way it does.

Standard benefits, non-standard prices

Medigap policies are labeled by letter — Plan A, Plan G, Plan N, and so on. Every Plan G sold in the United States, for example, covers the exact same things. The federal government requires it.

What is not standardized is the price. Two insurers can sell the identical Plan G in the same ZIP code and charge very different premiums. That's because Congress and state regulators let each company set its own rates, using one of three approved pricing methods.

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

With a community-rated policy, everyone who buys the same plan from the same company pays roughly the same premium, no matter how old they are. A 65-year-old and an 80-year-old with the same Plan G pay the same base rate.

The premium can still go up over time — usually because of inflation or the insurer's overall claims costs — but it does not go up simply because you had another birthday.

Method 2: Issue-age-rated

With an issue-age policy, the premium is based on your age when you first bought the plan. If you enrolled at 65, your rate is tied to age 65 pricing. If you enrolled at 72, it's tied to age 72 pricing.

After that, your premium won't rise because you're getting older. But, like every Medigap policy, it can still increase due to inflation and claims trends.

Method 3: Attained-age-rated

Attained-age policies are priced based on your current age. The premium starts lower when you're younger and increases as you age — sometimes every year, sometimes at set age bands.

On top of those age-based increases, the premium can also rise due to inflation and claims costs. That's why an attained-age policy that looks affordable at 65 may feel very different at 80.

Why premiums rise even when benefits can't

Regardless of pricing method, three forces push Medigap premiums up over time:

None of these changes affect what your policy covers. The benefits are locked in by federal standards. Only the price moves.

What this means in Fontana

Fontana is in San Bernardino County, where Medicare beneficiaries can choose from a range of Medigap policies sold by private insurers licensed in California. Which of the three pricing methods a company uses depends on the insurer — and state rules also play a role in what's allowed and how rate increases must be justified.

If you're comparing policies, ask each insurer directly:

1. Which pricing method does this plan use? 2. What has the rate history looked like over the past several years? 3. How often do premiums typically change?

The answers can help you compare not just today's price but the likely cost years down the road.

Where to get personalized help

Because rules and available policies vary by state and by company, general information can only take you so far. For help specific to your situation:

By the numbers

Medicare Part B premium, 2006–2026

The standard monthly Part B premium has climbed from $88.50 in 2006 to $202.90 in 2026. Hover any point for that year’s premium.

$0$50$100$150$200200820122016202020242026

Source: CMS. Standard premium shown; in some hold-harmless years many existing enrollees paid less. Confirm at Medicare.gov.

By the numbers

How people get Medicare in San Bernardino County

67% are on Medicare Advantage
(MA penetration in San Bernardino County)
67%
33%
Medicare Advantage Medicare Supplement (Medigap) Original Medicare only
U.S. average

MA penetration from CMS enrollment data; Medigap share is an estimate. U.S. average is about 54% Medicare Advantage. These are area-level figures, not plan-specific.

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The parts of Medicare

Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care. Most people pay no premium for Part A.

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When can you enroll? An interactive year

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October 15 – December 7 — anyone with Medicare can join, switch, or drop a Medicare Advantage or Part D plan. Changes take effect January 1.

Enrollment windows are federal and the same nationwide. Confirm your personal dates at Medicare.gov or 1-800-MEDICARE.

Good to know

Frequently asked questions

Can an insurance company change my Medigap benefits after I enroll?
No. Medigap benefits are standardized by federal law. A company cannot add, remove, or alter what a lettered plan covers. Only the premium can change over time.
If my Medigap premium goes up, can I switch to a different policy?
You can apply for a different Medigap policy at any time, but outside of your initial six-month Medigap Open Enrollment Period (or certain guaranteed-issue situations), insurers in most states can use medical underwriting. That means they can consider your health when deciding whether to accept you and what to charge. Speak with a SHIP counselor before switching.
Does Medigap cover prescription drugs?
No. Medigap policies sold today do not include prescription drug coverage. For drugs, you would enroll in a separate Medicare Part D plan. In 2026, Part D has a $2,100 out-of-pocket cap and a maximum deductible of $615, and the old coverage gap ("donut hole") has been eliminated.
When can I make changes to my Medicare coverage?
Medicare's Annual Enrollment Period runs from October 15 to December 7 each year. The Medicare Advantage Open Enrollment Period runs from January 1 to March 31. Medigap, however, has its own rules and is not tied to those windows — you can apply any time, subject to underwriting outside your protected enrollment periods.
Sources & further reading
  • CMS — Medicare Supplement Insurance (Medigap) rules (medicare.gov)

For personalized answers, contact Medicare.gov, 1-800-MEDICARE, or your local SHIP.

Also for Fontana

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This page was last updated: September 2026.

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