Insights · Medicare

How Medicare Supplement Planning Works

The benefits behind a plan letter are fixed by law, so every carrier selling that letter covers the same things. What they do not share is price, how that price behaves as you age, and whether the company will still be paying claims in twenty years.

An advisor pointing to an open binder while an older couple watches across a table in a book-lined room

Medicare Supplement planning has two halves. The first is choosing a plan letter, which is a coverage decision governed by federal standardization and by a one-time enrollment window. The second is choosing which company to buy that letter from, which is not a coverage decision at all, because the benefits are identical across carriers. That second half turns on three things: how much the carrier has raised rates on existing policyholders, which of the three pricing methods it uses, and its financial strength. A premium that looks competitive at 65 can behave very differently by 85.

What to know up front

  • Same letter, same benefits, whichever company sells it. The comparison is price and carrier behavior, not coverage.
  • This year's premium is a weak predictor of what you will pay later. Rate-increase history is a better one.
  • Three pricing methods exist, and they diverge with every birthday rather than converging.
  • A Medigap policy is a contract you may rely on for decades, which makes the carrier's financial strength rating worth looking up.
  • The premium is a recurring withdrawal from the retirement paycheck, so it belongs in the cash-flow projection rather than beside it.

Two halves of one decision

Securities are offered through Cetera Wealth Services, LLC, member FINRA/SIPC. Advisory services are offered through Cetera Investment Advisers LLC, a registered investment adviser. Cetera is under separate ownership from any other named entity. Insurance products, including Medicare Supplement policies, are offered through licensed affiliates. This material is general information and is not individualized investment, tax, legal, or insurance advice, and is not a recommendation of any plan, carrier, or policy.

Most writing about Medigap stops at the first half: which letter covers what, and when you can enroll without medical underwriting. That material matters and we cover it in Medicare Supplement planning before you retire, including the six-month window that is the only genuinely irreversible part of the subject.

This page is about the second half, which gets far less attention and is where the money quietly goes. Once you know which letter you want, you still have to decide who to buy it from, and that decision is being made with almost no information if the only number on the table is this year's premium.

Choosing the letter is a coverage decision. Choosing the company is a thirty-year pricing decision wearing the same clothes.

What is identical, what is not

Medigap benefits are standardized by federal rule. A plan sold under a given letter must provide the benefits assigned to that letter, which means the coverage question is settled once you pick one. Massachusetts, Minnesota, and Wisconsin standardize differently; Illinois uses the letter system.

What is not standardized is everything else: the premium, how often and by how much it has been raised, the method used to set it, the company's financial condition, and the service you get when a claim is confusing. Those differ materially between carriers selling the identical policy.

Two practical consequences follow. Comparing coverage between carriers for the same letter is wasted effort. And a price difference between two carriers for that letter is not buying you anything different today, which makes the question of why it is cheaper worth asking.

Rate-increase history

Medigap premiums rise. That is expected: claims costs rise, and a block of policyholders ages. What varies is how much, and how consistently, a given carrier has passed that through.

A carrier can enter a market with an attractive premium and then raise it steadily, or hold increases closer to the underlying cost trend. Over a retirement that may run thirty years, the difference between those two paths can exceed the difference in starting premium several times over, and none of it is visible in a quote.

The question to ask is specific: what have your rate increases been in Illinois for this plan letter over the last several years? Carriers and brokers can answer it. A refusal, or a vague answer, is itself a data point. State insurance departments also publish filed rate information, and the Illinois Department of Insurance is the place to look.

The three pricing methods

Underneath the premium sits a method, and it determines how the price behaves as you age. There are three, and the one you are buying is a question with a factual answer.

How the three methods set a premium
MethodHow the premium is setHow it behaves over time
Community-ratedEveryone with that policy pays the same regardless of ageChanges with general rate increases, not with your birthday
Issue-age-ratedBased on your age when the policy was issuedDoes not rise because you aged, though general increases still apply
Attained-age-ratedBased on your current age, recalculated as you get olderRises as you age, on top of general increases

All three are legitimate and all three are sold. Which methods are available can vary by state. Any premium is subject to the terms of the policy issued and to approved rate changes.

The reason this matters is that an attained-age policy is often the least expensive option at 65 and the comparison reverses later, because the price is climbing for two reasons at once rather than one. None of that makes it the wrong choice; it makes it a different choice, and one that should be made knowingly rather than discovered at 80.

Financial strength

A Medigap policy is a promise to pay claims for as long as you keep it, which for someone buying at 65 could be three decades.

Independent agencies including AM Best and S&P publish financial strength ratings that assess an insurer's ability to meet its ongoing obligations. The ratings are free to look up and are not the same as a review of the product or the price. What they speak to is the company behind the contract.

Worth knowing: the rating is an opinion from a rating agency rather than a guarantee, agencies use different scales, and a rating can change. It is a reasonable input to a decision about a long-dated contract, not a substitute for one. Guarantees are subject to the claims-paying ability of the issuing insurer.

What to ask, and of whom

Three kinds of help exist for this purchase, and they are not interchangeable.

  • An independent agent or broker can quote the same letter across multiple carriers and is generally compensated by the carrier whose policy is placed. Ask how many carriers were quoted and which ones.
  • A captive agent represents one company, which is not a problem provided you know it and compare elsewhere.
  • Your State Health Insurance Assistance Program offers free counseling with no sales involvement. In Illinois that program is run through the Department on Aging.

Five questions cover most of what matters. What have your increases been in Illinois for this letter over recent years. Which pricing method is this policy. What is the carrier's current financial strength rating. How many carriers did you quote for this letter. And am I inside my guaranteed-issue window, or will this application be underwritten?

That last one is the question to ask first, because it is the only one with a deadline attached.

Where the premium sits in the plan

A Medigap premium is not an insurance decision that happens to cost money. It is a recurring withdrawal from the retirement paycheck, for life, that rises over time.

That means it belongs in the cash-flow projection alongside the Part B and Part D premiums, with an assumption about growth rather than a flat line. It also means the funding question matters: an HSA can pay Part B, Part D, and Medicare Advantage premiums but not a Medigap premium, which is a real after-tax difference between the two Medicare paths and is covered in using a health savings account in retirement.

And the withdrawal that funds the premium is itself taxable income, which can affect the taxable share of Social Security and the Medicare premium tier two years out, covered in coordinating income, Medicare, and investments. None of that changes which letter is right. It changes where the money to pay for it should come from.

Serving Oak Lawn

Oak Lawn is anchored by Advocate Christ Medical Center, one of the area's largest employers, and that shapes the conversations that come from this community. Health-system and municipal retirees arrive weighing retiree health coverage against Medicare, pension elections, and rollover decisions, usually at the same time and usually on a deadline.

For Oak Lawn clients the work is Medicare enrollment and supplement timing set against the retirement date, retirement income planning that puts the premium into the cash-flow projection rather than beside it, investment management, and tax-aware withdrawal sequencing in coordination with your CPA. Medicare Supplement policies are placed through licensed affiliates.

Richard Casolari, Financial Advisor, Investment Advisor Representative, CFP®, has spent roughly fifty years in financial services, much of it with households in exactly this position. The practice is founder-led and based a short drive away in Palos Heights.

Fees, charges and expenses are detailed in the Cetera Wealth Services LLC's ADV Part 2A. For a comprehensive review of your personal situation, always consult with a tax or legal advisor. Neither Cetera Wealth Services LLC nor any of its representatives may give legal or tax advice.

Securities offered through Cetera Wealth Services, LLC, member FINRA/SIPC. Advisory services offered through Cetera Investment Advisers LLC, a registered investment adviser. Cetera is under separate ownership from any other named entity. Insurance products are offered through licensed affiliates.

This material is for general information only and is not a recommendation of any insurance plan, carrier, or policy, not a recommendation to buy or sell any security or insurance product, and not a solicitation in any jurisdiction where the advisor is not properly registered. Any insurance benefit is subject to the terms, conditions, limitations, and exclusions of the policy issued, and guarantees are subject to the claims-paying ability of the issuing insurer. Financial strength ratings are opinions of independent rating agencies, use differing scales, and are subject to change. Medigap plan availability, premiums, rate filings, enrollment rules, and state protections change and are revised; confirm current details at Medicare.gov, with the Illinois Department of Insurance, or with a licensed professional before acting. This material has not been reviewed or endorsed by the Centers for Medicare and Medicaid Services or any government agency.

Common Questions

Questions about comparing Medigap policies

If Medigap plans are standardized, does the company matter?

The coverage does not differ, but almost everything else does. Carriers selling the identical plan letter differ on premium, on how much they have raised rates on existing policyholders, on which pricing method they use, on financial strength, and on service. Since the benefits are fixed by federal standardization, those are the only things left to compare, and they are the things that determine what you actually pay over a long retirement.

What are the three Medigap pricing methods?

Community-rated means everyone with that policy pays the same regardless of age. Issue-age-rated sets the premium from your age when the policy was issued, so it does not rise because you aged. Attained-age-rated recalculates from your current age, so it rises as you get older on top of any general increase. All three are legitimate, availability varies by state, and the method you are buying is a factual question the carrier can answer.

Why does rate-increase history matter more than the quoted premium?

Because the quote describes one year and the policy may last thirty. Premiums rise as claims costs rise and a block of policyholders ages, but carriers differ in how much they pass through and how consistently. A lower starting premium from a carrier with a history of steep increases can cost more over time than a higher one from a carrier holding closer to the underlying trend, and none of that appears in a quote.

What does a carrier's financial strength rating tell me?

It is an independent agency's assessment of the insurer's ability to meet its ongoing obligations, which matters for a contract you may rely on for decades. Ratings are free to look up from agencies such as AM Best and S&P. They are opinions rather than guarantees, the agencies use different scales, and a rating can change, so it is one input to the decision rather than the decision itself.

Should I use a broker, a captive agent, or free counseling?

They do different jobs. An independent agent or broker can quote the same letter across several carriers and is generally compensated by the carrier whose policy is placed. A captive agent represents one company, which is fine as long as you know it and compare elsewhere. Your State Health Insurance Assistance Program offers free counseling with no sales involvement; in Illinois it runs through the Department on Aging.

How does the Medigap premium affect my retirement income plan?

It is a recurring lifetime cost that rises over time, so it belongs in the cash-flow projection with a growth assumption rather than as a flat line. The funding question matters too: an HSA can pay Part B, Part D, and Medicare Advantage premiums but not a Medigap premium. And the withdrawal that funds it is taxable income, which can affect the taxable share of your Social Security and your Medicare premium tier two years later.

No Cost, No Obligation

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Schedule a Retirement Readiness Review and we will put the premium into your cash-flow projection and confirm your enrollment window first.

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A Retirement Readiness Review is an introductory conversation. It is not tax, legal, or insurance advice, is not a recommendation of any plan or carrier, and does not substitute for your CPA or attorney. Securities offered through Cetera Wealth Services, LLC, member FINRA/SIPC. Advisory services offered through Cetera Investment Advisers LLC, a registered investment adviser. Insurance products are offered through licensed affiliates.

Richard Casolari, CFP, in a navy suit and striped tie against a dark studio background

About the Author

Richard Casolari, CFP®

Founder, Advanced Financial Concepts · Palos Heights, Illinois

Richard Casolari is a CERTIFIED FINANCIAL PLANNER™ professional and the founder of a retirement income planning practice in Palos Heights, Illinois. He has spent roughly fifty years in financial services, working with pre-retirees and retirees across Chicago's south and southwest suburbs.

The work coordinates retirement income planning, investment management, tax-aware withdrawal sequencing in coordination with your CPA, Medicare enrollment and supplement timing, and protection planning through licensed affiliates, into one written plan that is reviewed on a schedule. Securities are offered through Cetera Wealth Services, LLC, member FINRA/SIPC. Advisory services are offered through Cetera Investment Advisers LLC, a registered investment adviser. The registration history behind that work is public on FINRA BrokerCheck, CRD #42779.