Medigap premiums by age can vary dramatically depending on how your insurance company calculates its rates. Medicare Supplement Insurance — commonly known as Medigap — helps cover out-of-pocket costs that Original Medicare doesn’t pay. However, the premium you pay depends on more than just which plan letter you choose. Three distinct pricing methods determine how insurers set and adjust your rates over time. Understanding these methods is essential before enrolling. According to KFF, approximately 13.5 million Americans currently hold Medigap policies. For many, the pricing method matters more than the starting premium.
Three Pricing Methods That Determine Medigap Premiums by Age
Every Medigap insurer uses one of three rating methods: attained-age, issue-age, or community-rated. Each method treats age differently when calculating your monthly premium. The method your insurer uses will shape your costs for decades.
Attained-age rating bases your premium on your current age. Premiums start lower at age 65 but increase annually as you get older. On top of age-based increases, general medical inflation drives rates higher still. As a result, premiums under this method can roughly double between age 65 and 85. About 69% of Medigap plans nationally use attained-age pricing, according to an ASPE/HHS analysis.
Issue-age rating locks your premium to the age when you first bought the policy. A person who enrolls at 65 keeps that age-based rate permanently. Premiums can still rise due to inflation and claims experience. Yet age alone never triggers an increase. Roughly 19% of plans use this method. Starting costs tend to be higher than attained-age plans, but long-term savings can be significant.
Community rating charges everyone the same premium regardless of age. A 75-year-old pays the same base rate as a 65-year-old. Approximately 12% of plans use community rating. Nine states — including New York, Connecticut, and Minnesota — require this method by law.
How Medigap Premiums by Age Compare Over Time
The difference between pricing methods becomes clear over 10 to 20 years. Attained-age plans offer the lowest entry cost at 65. In contrast, they typically become the most expensive option by age 75 or 80. Issue-age and community-rated plans start higher but grow more slowly. The annual age increment under attained-age rating compounds over time. When combined with medical inflation, costs escalate quickly.
Consider the long-term trajectory. An attained-age plan might increase roughly 58% between ages 65 and 75 from age-related adjustments alone. Meanwhile, an issue-age plan over that same period may increase only 14%, since those increases reflect inflation — not aging. Community-rated plans behave similarly to issue-age plans over time. Both avoid the compounding effect of annual age-based increases.
| Rating Method | Cost at Age 65 | Age-Based Increases? | Best For |
|---|---|---|---|
| Attained-Age | Lowest starting premium | Yes — annual increases | Short-term savings |
| Issue-Age | Moderate starting premium | No — locked at purchase age | Long-term cost control |
| Community-Rated | Highest starting premium | No — same rate for all ages | Predictable budgeting |
All three methods still allow increases for medical inflation and insurer experience. No Medigap premium is truly frozen. The key difference is whether age itself adds an extra layer of cost each year.
Your Open Enrollment Period and State Protections
Timing matters enormously when shopping for Medigap. The federal Medigap Open Enrollment Period lasts six months. It begins the first month you are both 65 or older and enrolled in Medicare Part B. During this window, insurers cannot deny coverage or charge higher medigap premiums by age or health status. Medical underwriting does not apply.
After the window closes, most states allow insurers to use medical underwriting. Pre-existing conditions can then lead to higher premiums or outright denial. Some states offer stronger protections. New York provides year-round guaranteed issue with community rating. Connecticut, Massachusetts, and Maine also mandate additional enrollment windows. Check your state SHIP program for local rules — counselors provide free, unbiased guidance at no cost.
Enrolling during your Open Enrollment Period typically locks in the best available rate. Missing it can mean paying substantially more — or losing access to certain plans entirely.
Smart Strategies for Comparing Medigap Costs
Start by asking each insurer which pricing method they use. This single question reveals more about your future costs than any premium quote. Then compare same-letter plans only. Plan G from UnitedHealthcare covers the exact same benefits as Plan G from Mutual of Omaha or Blue Cross. The only differences are price and the rating method behind it.
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Request each company’s rate increase history for the past five to ten years. Some insurers consistently impose larger annual increases regardless of their rating method. Additionally, ask about available discounts. Many carriers — including Aetna, Cigna, and Humana — offer reductions for non-smokers, married couples, or annual payment. These discounts can range from 5% to 15%.
The Medicare.gov plan comparison tool lets you compare standardized plans by ZIP code. For personalized help, contact your local SHIP counselor at 1-877-839-2675. They can walk you through medigap premiums by age in your specific state and help you evaluate which rating method fits your budget.
Frequently Asked Questions
Do all Medigap plans use the same pricing method?
No. Each insurance company chooses its own rating method. Two companies selling Plan G in the same ZIP code may use different methods. For this reason, medigap premiums by age can differ significantly between carriers offering identical coverage.
Can I switch from an attained-age plan to a community-rated plan later?
Switching is possible, but medical underwriting may apply outside your Open Enrollment Period. In most states, insurers can evaluate your health and charge accordingly. However, some states like New York and Connecticut offer guaranteed-issue windows that allow switching without health screening.
Which pricing method saves the most money over time?
Issue-age and community-rated plans generally cost less over a 15- to 20-year period. Attained-age plans start lower but compound with age-based increases annually. Consequently, medigap premiums by age under attained-age rating often surpass the other methods within 8 to 10 years of enrollment.
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Official Sources & Resources
For verified information on Medicare regulations and consumer protection:
- Medicare.gov (Official Site): medicare.gov
- CMS (Centers for Medicare & Medicaid Services): cms.gov
- NAIC (National Association of Insurance Commissioners): naic.org
- KFF Medicare Research: kff.org/medicare
- Social Security Administration: ssa.gov
Content last reviewed May 2026. If you notice any outdated information, please contact us.