Worst Medicare Supplement Companies: How to Spot Carriers That Bait You With Low Premiums and Hike Your Rates

You've decided Medigap is the right choice for your parent. You've picked Plan G. Now you need to choose which insurance company to buy it from — and this is where most people make a mistake that costs them thousands of dollars over the next decade.

Because Medigap plans are standardized by federal law, a Plan G from Blue Cross covers the exact same benefits as a Plan G from Mutual of Omaha or AARP/UnitedHealthcare. The coverage is identical. The only differences are the price, the rate increase history, and how the company treats your parent when they file a claim.

And those differences are enormous. Some carriers offer low introductory premiums and then raise rates 15–20% in years 2 and 3. Some carriers have a history of claims processing complaints that would make you think twice. Some carriers are financially shaky, which affects their ability to keep premiums stable long-term.

This article doesn't name a "Top 10 Worst" list — that would be irresponsible, because the worst carrier in Florida might be the best carrier in Oregon. Instead, it gives you the framework to evaluate any Medigap carrier in your parent's state, so you can identify the bad actors before they have your parent's money.

The "teaser rate" trap

The single most common way seniors get burned by Medigap carriers is the introductory low premium.

Here's how it works: A carrier prices its Plan G at $120/month for a 65-year-old — $30–$50 below the average in that state. The agent enthusiastically presents this as the "best deal available." Your parent signs up. Year 1 is great.

In Year 2, the premium jumps to $150. In Year 3, $175. By Year 5, your parent is paying $210/month — more than they would have paid had they chosen a carrier with a higher initial rate but a track record of modest annual increases.

This strategy is called "attained-age pricing with front-loaded discounts," and it's perfectly legal. The carrier is betting that once your parent is enrolled — especially if they develop health conditions — they won't leave, because switching carriers requires medical underwriting in most states.

How to detect it: Ask the agent or carrier for the rate increase history for the last 5 years, specifically for Plan G in your parent's state. If the increases have been consistently above 8–10% annually, the initial low rate is a teaser. Compare this to carriers whose rate increases have averaged 3–6% — even if their starting premium is slightly higher.

The three metrics that reveal a bad carrier

1. Loss ratio

The "Medical Loss Ratio" (MLR) tells you what percentage of premiums collected by the carrier is actually spent on paying claims. A high MLR (80%+) means the carrier is returning most of your parent's premiums as healthcare payments. A low MLR (below 65%) means the carrier is keeping a large share as profit and administrative costs.

By federal law, Medigap carriers must maintain a minimum MLR of 65% for individual policies and 75% for group policies. But "meeting the legal minimum" is not a sign of a good carrier — it's a sign of a carrier extracting maximum profit.

What to look for: Carriers with MLRs consistently above 75–80% are spending more on your parent's care and less on executive salaries and marketing. Your state's Department of Insurance publishes MLR data in annual rate filing reports.

2. Rate increase history

Past rate increases are the single best predictor of future rate increases. A carrier that has raised Plan G rates by 12–15% annually over the past five years is likely to continue that pattern. A carrier averaging 3–5% increases is demonstrating pricing discipline.

What to look for: Request the rate increase history from the carrier directly, or check your state Department of Insurance website. Many states publish rate filing histories online. A pattern of double-digit increases is a red flag — it often signals that the carrier under-priced initially to attract enrollees and is now correcting.

3. Financial strength rating

Medigap is a long-term relationship — your parent may be on this plan for 20+ years. The carrier's financial stability determines whether they can honor that commitment without resorting to aggressive rate hikes.

The major rating agencies — AM Best, S&P, Moody's — rate insurance companies on their ability to pay claims. An "A" rating or higher indicates strong financial health. A "B+" or lower warrants further investigation.

Why this matters: A financially weak carrier may offer low premiums today but lack the reserves to maintain stable pricing as their enrollee pool ages. When the claims start exceeding expectations, the only lever they have is raising premiums.

Common complaint patterns to watch for

Beyond the financial metrics, there are behavioral red flags that show up in state insurance department complaint records and consumer forums.

Slow claims processing

Some carriers are notorious for taking 30–60 days to process straightforward claims, requiring multiple follow-up calls, or initially denying claims that are clearly covered under the standardized plan. Since all Plan G policies cover the same benefits, there's no legitimate reason for a carrier to deny a covered service — but some carriers deny first and approve on appeal, hoping a percentage of enrollees won't follow up.

Where to check: Your state Department of Insurance maintains a complaint database. Search for the carrier's name and look for patterns — isolated complaints happen to every company, but a pattern of claims processing complaints suggests a systemic issue.

Rate increase "shock" in specific states

Medigap premium regulation varies by state. In "community-rated" states (like New York), every enrollee pays the same premium regardless of age. In "attained-age" states (the majority), premiums rise as the enrollee ages. Some carriers exploit attained-age pricing by keeping increases modest until age 75–80 and then implementing larger increases, knowing that the enrollee is effectively locked in by health conditions.

Where to check: Ask the carrier specifically, "What were the rate increases for a 75-year-old and an 80-year-old in my parent's state over the past three years?" The pattern across age bands tells a more complete story than the rate for a 65-year-old alone.

Customer service quality

When your 82-year-old parent calls the insurance company about a billing question, how long do they wait on hold? Can they reach a human being? Is the representative patient and knowledgeable?

These questions feel soft compared to loss ratios and rate histories, but they affect your parent's daily experience with the plan. Some carriers invest in customer service; others route Medicare supplement calls through understaffed call centers with high turnover.

Where to check: The NAIC (National Association of Insurance Commissioners) publishes complaint ratios — the number of complaints per policy in force. A complaint ratio above the industry median is a signal worth investigating.

How to evaluate a Medigap carrier: the 5-step process

1. Get quotes from at least 3–5 carriers for Plan G (or Plan N) in your parent's zip code. Your state SHIP counselor can provide a complete list of carriers and current rates — this service is free.

2. Request rate increase history for the past 5 years from each carrier. If a carrier won't provide this, that's a red flag in itself.

3. Check the loss ratio in your state's Department of Insurance annual reports. Favor carriers above 75%.

4. Check the financial strength rating on AM Best (ambest.com). Favor carriers rated A or higher.

5. Search the complaint database at your state Department of Insurance and the NAIC. Look for patterns, not isolated incidents.

This process takes about 2 hours. It can save your parent thousands of dollars over the next decade.

The carriers people often ask about

Without naming a "worst" list (which would depend entirely on state and year), here are the categories of carriers that tend to generate the most complaints:

• Small or regional carriers with aggressive introductory pricing: These carriers often lack the financial reserves of larger companies and compensate with steeper rate increases as the pool ages.
• Carriers entering a new state market: When a carrier launches in a new state, they sometimes price below cost to attract enrollees, then correct upward once they have market share.
• Carriers with "select" or "preferred" network plans: Some Medigap carriers offer lower-cost plans that require using a preferred network. This saves money if your parent's doctors are in-network, but it introduces network restrictions that standard Medigap doesn't have.

The best carrier for your parent is the one with a strong financial rating, a 5-year history of modest rate increases in your specific state, and a loss ratio that shows they're spending premiums on care rather than keeping them as profit.

Our Medicare Enrollment Guide includes a carrier evaluation worksheet where you can fill in rate quotes, rate increase histories, and financial ratings side by side for every carrier available in your parent's zip code. It turns the 5-step process above into a structured comparison you can complete in one sitting.

This article is for educational purposes only. It does not recommend or discourage specific insurance carriers. Medigap plan benefits are standardized by federal law, but premiums and rate increase patterns vary by carrier, state, age, and gender. For a free list of all Medigap carriers in your state with current rates, contact your State Health Insurance Assistance Program (SHIP) or call 1-800-MEDICARE (1-800-633-4227). All information reflects 2026 regulations.