Searches for the worst Medicare Supplement companies are common, but the honest answer is that there is no credible, static “top 10 worst” list — and publishing one would be misleading. Medigap benefits are set by federal law, complaint and rate data change constantly, and a carrier that looks poor in one state or one year can look fine in another. What you actually need is a repeatable way to evaluate insurers and steer clear of a bad choice for your situation. This article gives you that framework. It is educational information, not insurance advice, and it does not label any specific company as “worst.”
Why “Worst Company” Lists Are the Wrong Question
Medicare Supplement (Medigap) plans are standardized by the federal government. Coverage is sold in lettered plans — A, B, D, G, K, L, M, N, plus the closed plans F and C — and the benefits within each letter are identical no matter which insurer sells them. A Plan G from any carrier pays the same things as a Plan G from any other carrier. That means you are never choosing “better coverage” by picking one company over another for the same letter.
Because coverage is identical per letter, the meaningful differences between insurers are price, how fast that price rises, financial stability, and service. A company can be a poor fit for you if it charges more for the same Plan G, raises rates aggressively, or handles claims and calls badly — but those things are measurable and, importantly, they vary by state and by year. So instead of chasing a “worst companies” ranking, learn to read the data yourself.
The Four Factors That Actually Matter
When benefits are fixed, quality comes down to four measurable factors. Weigh all four together — no single number tells the whole story.
1. Premium and rate-increase history
Today’s premium is only half the picture. Ask what a carrier has done to its Medigap rates in your state over the past several years. A plan with a low introductory premium but a history of steep annual increases can cost far more over a decade than a plan that started slightly higher and rose slowly. Rate-increase filings are public; your state department of insurance (DOI) can point you to them.
2. Financial strength (AM Best and similar ratings)
An insurer needs the reserves to pay claims for decades. Independent rating agencies such as AM Best publish financial-strength ratings; many advisors look for A- or higher. A weak rating does not guarantee problems, but it is a reason to look more carefully and compare against stronger-rated alternatives offering the same plan letter.
3. Complaint record (NAIC complaint index and state DOI)
The National Association of Insurance Commissioners (NAIC) publishes a complaint index through its Consumer Information Source. The index is scaled so that 1.0 represents the national median for a company’s size; a number well above 1.0 means more complaints than expected, and below 1.0 means fewer. One year of elevated complaints may be a blip, but a multi-year pattern is a genuine warning sign. Your state DOI may also publish complaint data and any enforcement actions.
4. Pricing method
Medigap policies are priced three ways, and this shapes your long-term cost:
- Community-rated — everyone pays the same regardless of age; premiums do not rise simply because you get older.
- Issue-age-rated — your premium is based on your age when you buy and does not increase with age thereafter.
- Attained-age-rated — premiums start lower but rise as you get older, which can make an initially cheap plan expensive later.
Two carriers can quote the same Plan G at similar prices today yet diverge sharply over 10 years because of pricing method alone. Ask which method applies before you enroll.
Red Flags to Watch For
Beyond the numbers, certain patterns should make you slow down regardless of the insurer’s name:
- Steep or repeated rate hikes. A history of large annual increases erodes the value of any policy and can trap you if your health has changed and you cannot pass underwriting to switch.
- A high NAIC complaint index sustained over multiple years. Persistent complaints about claims delays or billing are more telling than a single bad year.
- Weak financial-strength ratings. Below investment-grade or low ratings warrant extra scrutiny.
- Unusually low “teaser” premiums. A price far below competitors for the same letter can signal attained-age pricing that catches up quickly.
- High-pressure marketing. Urgency tactics, especially around enrollment deadlines, or an agent who represents only one company and pushes it hard, are reasons to get a second opinion.
Plan F and Plan C Are Closed to New Enrollees
One structural rule affects your options before you even compare companies: Plan F and Plan C are closed to people who became newly eligible for Medicare on or after January 1, 2020. Those plans covered the Part B deductible. If you were eligible before that date you may still buy or keep them, but most people newly aging into Medicare cannot. As a result, Plan G and Plan N are the most popular choices for new enrollees today. Knowing which letters you can actually buy narrows the field before you weigh carriers.
How to Compare Companies the Right Way
Put the framework into practice with a simple, repeatable process:
- Pick your plan letter first. Decide between comprehensive coverage (Plan G) and a lower premium with small copays (Plan N). See our overviews of Plan G and Plan N.
- Gather quotes for that one letter from several carriers. Because the coverage is identical, you are comparing apples to apples on price. Use the Medicare.gov plan finder to see policies available in your ZIP code.
- Check each carrier’s NAIC complaint index and AM Best rating. Look for a low, stable complaint index and a solid financial-strength rating.
- Ask about rate-increase history and pricing method in your state. Favor stable histories and, where possible, community or issue-age rating for predictability.
- Get free, unbiased help. Your State Health Insurance Assistance Program (SHIP) offers no-cost counseling, and an independent broker who represents many carriers can pull side-by-side comparisons.
An independent broker is compensated similarly regardless of which carrier you choose, which reduces the incentive to steer you. That is different from a captive agent who sells for a single company. For a deeper walkthrough of scoring insurers on these metrics, see our companion guide on how to evaluate Medicare Supplement companies, and our overview of Medigap plans.
Frequently Asked Questions
Is there really a definitive list of the worst Medigap companies?
No. Because benefits are standardized and complaint, rate, and financial data change over time and by state, any fixed “worst” ranking is unreliable and potentially misleading. The better approach is to check current, objective data — the NAIC complaint index, AM Best ratings, and your state DOI’s filings — for the specific carriers quoting you.
Does it matter which company I buy Medigap from?
Yes, but not for coverage. Benefits are identical within a plan letter. What differs is premium, rate-increase history, financial strength, and service. Choosing a carrier with a poor rate history can cost you significantly more over the life of the policy.
Where can I check a company’s complaint record?
The NAIC maintains a Consumer Information Source at naic.org where you can look up a company’s complaint index. Your state insurance department website also publishes complaint data and any enforcement actions. Medicare.gov lists available Medigap carriers by ZIP code but does not include complaint data.
Can I switch companies if my insurer raises rates too much?
You can apply to switch at any time, but outside your Medigap Open Enrollment Period the new insurer may require medical underwriting. Some states offer birthday-rule or annual guaranteed-issue protections that allow switching without health questions. Check your state’s rules through your healthcare policy guide or state insurance department.
Are smaller Medigap companies worse than big ones?
Not necessarily. Some smaller regional carriers have excellent complaint records and competitive pricing, while some large ones do not. Smaller companies can have less diversified risk pools, which may increase premium volatility, so always check the financial-strength rating regardless of size.
Protecting Yourself From a Poor Medigap Choice
The best defense is not a blocklist of companies — it is a habit. Pick your plan letter, compare quotes for that letter across several carriers, and check each one’s complaint index, financial-strength rating, and rate-increase history before you enroll. Re-check that data annually and compare your current premium against fresh quotes, because the market shifts and a carrier that is a good fit today may not be in five years. Use your free SHIP counselor and, if you like, an independent broker. For a broader comparison of supplemental coverage options, read our Medigap vs Medicare Advantage analysis, and explore our healthcare costs guide for strategies to manage retirement healthcare spending.
TL;DR: There is no reliable fixed list of the “worst” Medigap companies, and we do not name any here. Medigap benefits are standardized by letter, so evaluate insurers on price, rate-increase history, AM Best financial strength, and the NAIC complaint index (plus your state DOI). Red flags: steep or repeated rate hikes, a high complaint index, weak ratings, and high-pressure marketing. Plan F/C are closed to those newly eligible on/after Jan 1, 2020; compare Plan G and Plan N. Use Medicare.gov and your free SHIP counselor.
Disclaimer: This article is independent, educational information and not insurance or financial advice. FMHC is not affiliated with, and does not endorse or disparage, any insurer. Complaint, rate, and financial data change over time and by state — verify current details at Medicare.gov, the NAIC, AM Best, and your state department of insurance before enrolling or switching.
Sources
- Medicare.gov — Medigap basics and how to compare policies
- Centers for Medicare & Medicaid Services (CMS) — Medigap standardization and Plan F/C eligibility rules
- National Association of Insurance Commissioners (NAIC) — Consumer Information Source and complaint index
- State Health Insurance Assistance Programs (SHIP) — free, unbiased Medicare counseling
- AM Best — insurer financial-strength ratings