How to Compare Medigap Plans Side by Side

Comparing Medigap plans side by side means lining up the standardized benefit letters (like Plan G or Plan N), checking how each insurer prices that same letter, and reviewing the insurer's rate history and customer service reputation. Because federal rules standardize what each lettered plan covers, your comparison should focus less on "which company covers more" and more on price, rating method, and service quality, since Plan G from one insurer covers exactly the same benefits as Plan G from another.

This matters because Medigap, also called Medicare Supplement insurance, fills gaps left by Original Medicare, things like coinsurance, copayments, and deductibles. Since the coverage itself is standardized in most states, the real decision-making happens in the details: premium pricing structure, insurer stability, and how your rate might change as you age. Below is a straightforward framework for comparing Medigap plans so you can make a confident choice without getting lost in sales jargon.

Start With the Standardized Benefit Letters

Every Medigap policy sold in most states follows a standardized format set by federal law, labeled with letters A through N (though not every state offers every letter, and Massachusetts, Minnesota, and Wisconsin use their own standardization systems). This means Plan G benefits are legally required to be the same whether you buy it from one insurer or another. The letter determines what's covered; the insurer determines what you pay and how that price behaves over time.

Before comparing companies, narrow down which letter fits your health needs and budget. Read our Medigap Plan G vs Plan N comparison for a detailed look at two of the most popular options, and see our Medicare Supplement Plan F guide if you're wondering about older, more thorough coverage (note that Plan F is no longer available to people who became eligible for Medicare on or after January 1, 2020).

Common Letters to Know

• Plan G: Covers nearly everything except the annual Part B deductible ($257 in 2026, per Medicare.gov).
• Plan N: Similar to Plan G but with small copays for some doctor and emergency room visits, usually at a lower premium.
• Plan A: The most basic level of coverage, with fewer included benefits.

Understand the Three Pricing Methods

This is often the biggest differentiator between Medigap plans that otherwise look identical on paper. Insurers use one of three methods to set and adjust your premium over time, and the method matters as much as the starting price.

• Community-rated: Everyone with the same plan pays the same premium regardless of age. Premiums may still rise due to inflation or claims experience, but not because you got older.
• Issue-age-rated: Your premium is based on your age when you first buy the policy. It won't increase simply because you age, though other rate hikes can still apply.
• Attained-age-rated: Your premium starts lower but increases as you get older, in addition to any other rate adjustments. This method often looks cheapest at first but can become the most costly over a decade or more.

Ask each insurer directly which pricing method they use for the plan you're considering. This single question can reveal more about your long-term costs than the initial quoted premium.

Build Your Side-by-Side Comparison

Once you know which letter plan fits your needs, request quotes from at least three insurers for that same letter. Organize the information the same way for each one so you're making an apples-to-apples comparison rather than relying on memory or a salesperson's summary.

What to Record for Each Quote

1. Monthly premium as quoted today.
2. Pricing method (community, issue-age, or attained-age).
3. Household or multi-policy discounts, if applicable.
4. Underwriting requirements, since outside of your Medigap Open Enrollment Period or a guaranteed issue situation, insurers may ask health questions. Learn more about when you can bypass this in our guide to Medigap guaranteed issue rights.
5. Financial strength rating from an independent agency like AM Best, Moody's, or Standard & Poor's.
6. Customer service reputation, including complaint ratios if available from your state insurance department.

Your State Health Insurance Assistance Program (SHIP) can provide free, unbiased help reviewing quotes, and the Medicare.gov Medigap plan finder lets you search insurers offering coverage in your ZIP code.

Timing Affects Your Comparison

When you shop matters as much as who you compare. During your six-month Medigap Open Enrollment Period, which starts the month you're 65 or older and enrolled in Medicare Part B, insurers must sell you any Medigap policy they offer at the best available rate, regardless of health history. Outside that window, insurers in most states can use medical underwriting to decide whether to accept you or what to charge, unless you qualify for a special enrollment period or guaranteed issue right.

If you're moving from Medicare Advantage back to Original Medicare with a Medigap policy, timing and guaranteed issue rights become even more important to understand before you switch. See our guide on how to switch from Medicare Advantage to Medigap for a walkthrough of that process, and review the broader differences in our Medicare vs. Medicare Advantage comparison if you're still weighing which path fits you.

Look Beyond Price Alone

A lower premium today doesn't always mean lower total cost over time, especially with attained-age-rated policies. It's also worth checking how long the insurer has offered Medigap coverage in your state, since newer entrants may not have an established rate-increase track record you can review. For a broader breakdown of how Medicare-related costs work together, see our Medicare cost guide, and if you want a wider view of how Medigap fits alongside other coverage types, our senior plan guide and plan comparison overview are good starting points.