Medicare Supplement
How Much Does Medicare Supplement Insurance Cost?
Medicare Supplement (Medigap) premiums vary based on several factors — carrier, location, plan letter, age, and rating method. Understanding how pricing works helps you evaluate your options and compare rates effectively.
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Why Medicare Supplement Premiums Vary
Unlike Original Medicare, which has federally set cost-sharing amounts, Medicare Supplement premiums are set by private insurance companies. Two people with identical Plan G coverage from different insurers may pay meaningfully different monthly premiums for the same standardized benefits.
This variation exists because each insurance company prices its plans based on its own claims experience, business strategy, and the rating methodology it uses. The benefits are standardized — the pricing is not.
This is why comparing rates across multiple carriers — rather than accepting the first quote you receive — can make a significant difference in what you pay each month.
Factors That Affect Your Medicare Supplement Premium
Not every factor applies in every state or with every carrier. The following are common factors that may affect the premium you are quoted.
Location
Premiums vary by state and ZIP code. Insurance markets, cost of care, and state regulations all affect what carriers charge in a given area.
Plan letter
Different plan letters (Plan G, Plan N, High-Deductible Plan G) carry different benefit levels and therefore different premiums. More comprehensive coverage generally means a higher monthly cost.
Carrier
Because benefits are standardized, the carrier you choose affects only your premium — not your coverage. Premiums for the same plan letter can vary substantially between insurers in the same ZIP code.
Age at enrollment
Depending on the carrier's rating method, your age when you first enroll may affect your initial premium and how it changes over time.
Tobacco use
Many carriers charge higher premiums for tobacco users. The surcharge amount and how it is applied varies by insurer.
Sex/gender
Some carriers use gender as a rating factor where permitted by state law. Availability of gender-based rating varies by state.
Household discount
Some carriers offer a discount when two people in the same household both enroll in a Medigap plan with that carrier. Availability and discount amount vary.
Rate increase history
Carriers adjust premiums over time based on claims experience. A carrier with a lower initial premium may have a history of larger annual increases. Reviewing a carrier's rate increase history is part of a thorough comparison.
How Carriers Set Premiums: Rating Methods
The rating method a carrier uses determines how your premium is calculated at enrollment and how it may change as you age. Three methods are used in the Medicare Supplement market.
Community-rated
Everyone enrolled in the same plan with the same carrier in the same area pays the same premium, regardless of age. Premiums may still increase over time due to inflation and claims experience, but age alone does not cause your premium to rise.
Often favorable for older enrollees because age does not directly drive the premium.
Issue-age-rated
Your premium is based on your age when you first enroll and does not increase solely because you get older. Premiums may still increase due to inflation and claims experience.
Enrolling at a younger age locks in a lower starting premium that does not rise with age.
Attained-age-rated
Your premium is based on your current age and increases as you get older, in addition to any general rate increases. Initial premiums are often lower than community-rated or issue-age-rated plans, but costs tend to rise more significantly over time.
A lower initial premium does not automatically mean lower long-term cost. Evaluating the rate increase trajectory matters.
Plan G vs Plan N: Cost Tradeoff
Plan G and Plan N are the two most commonly purchased Medigap plans for people new to Medicare. Plan G typically carries a higher monthly premium than Plan N because it covers more — specifically, Part B excess charges and the full Part B coinsurance without per-visit copayments.
Plan N typically has a lower monthly premium but requires copayments of up to $20 for some office visits and up to $50 for emergency room visits that do not result in inpatient admission. Plan N also does not cover Part B excess charges.
Whether the premium savings from Plan N outweigh the potential out-of-pocket costs depends on how frequently you use medical services and whether your providers accept Medicare assignment. An independent broker can help you model this comparison using actual rates in your area.
Rate Increases Over Time
Medicare Supplement premiums are not fixed for life. Carriers adjust premiums periodically based on their claims experience, inflation, and other factors. The frequency and magnitude of rate increases vary by carrier and market.
A carrier with a lower initial premium may have a history of larger annual increases, which can erode the initial savings over time. Reviewing a carrier's rate increase history — not just the current premium — is an important part of evaluating your options.
An independent Medicare broker who represents multiple carriers can provide rate increase history and help you evaluate the long-term cost picture, not just the initial premium.
A note on this page: No fabricated premium examples or rate ranges are included on this page. Actual premiums depend on your specific situation, location, and the carriers available in your area. The only accurate way to know what you will pay is to compare actual quotes.
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Sharon H.
Medicare client · Verified Google Review
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