Understanding Medicare Supplement Plans and Why People Switch
Medicare Supplement plans, also called Medigap policies, are insurance plans sold by private insurance companies. These plans work alongside Original Medicare (Part A and Part B) to help pay for costs that Medicare doesn't cover. According to the Centers for Medicare & Medicaid Services, approximately 9 million people in the United States are enrolled in Medigap plans as of 2024.
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People switch Medicare Supplement plans for several reasons. Your current plan might not cover the medical services you need, or your monthly premium could be increasing. Some individuals move to a different state where their current plan isn't available. Others find that a different plan offers better value for their healthcare situation. The average Medigap premium ranges from $100 to $300 per month depending on the plan type, your age, location, and the insurance company offering the plan.
It's important to know that switching plans is different from switching Medicare Advantage plans. With Medigap, you have more flexibility to change plans without waiting for a specific enrollment period, though certain rules do apply. Understanding how switching works helps you make decisions based on your actual healthcare needs rather than confusion about the process.
The ten standardized Medigap plans are labeled A, B, C, D, F, G, K, L, M, and N. Plan F was discontinued for people new to Medicare after December 31, 2019, but continues for those who already had it. Each plan covers the same benefits within its letter designation, no matter which insurance company sells it. This standardization means you can compare plans by cost alone, since the coverage is identical across companies.
Practical takeaway: Before considering a switch, identify what costs in your current coverage are causing problems. Are premiums too high? Are you paying out-of-pocket costs that you'd like covered? Understanding your reason for switching helps you choose a new plan that actually addresses your situation.
Timing and Enrollment Periods for Switching Plans
Medicare Supplement switching rules focus on specific enrollment periods, though the rules are more flexible than those for Medicare Advantage plans. Unlike Medicare Advantage, which has rigid annual enrollment periods, Medigap has what's called "open enrollment periods" and "guaranteed issue rights" that may apply to your situation.
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If you're within six months of turning 65 and enrolling in Medicare Part B, you have a Guaranteed Issue Period. During this time, you can purchase any Medigap plan without medical underwriting, meaning the insurance company cannot deny you coverage or charge you more based on your health. This period typically starts the month you turn 65 and are signed up for Part B, and it lasts six months. This is considered the best time to purchase a Medigap plan because you have the most protection.
Outside of this initial period, switching plans becomes more complicated. Most states follow "medically underwritten" switching after your initial period ends. This means when you try to switch to a new Medigap plan, the insurance company can review your medical history and decide whether to cover you. They may decline coverage or charge a higher premium based on your health conditions. For this reason, people often stay with their current plans even if they're not perfectly satisfied, to avoid potential denial or higher costs.
Some situations do provide guaranteed issue rights even after your initial enrollment period. If your current Medigap insurance company goes out of business or stops selling Medigap plans in your area, you may have guaranteed issue rights to switch. If you move out of your plan's service area, you may also have protections. Additionally, if you dropped Medigap coverage to enroll in a Medicare Advantage plan and now want to switch back to Medigap within one year, you may have guaranteed issue rights to return to your previous plan type.
The Medicare.gov website provides a "Plan Finder" tool that shows which plans are available in your area and their costs. This tool updates annually and is free to use. You can compare plans by their monthly premium, deductible, and coverage details. Your state's health insurance counseling program, also called the State Health Insurance Assistance Program (SHIP), offers free counseling about Medigap options in your area and can explain your specific situation.
Practical takeaway: Check whether you have guaranteed issue rights before contacting insurance companies about switching. Contact your state's SHIP program or Medicare directly at 1-800-MEDICARE to understand what protections may apply to your situation.
Evaluating Your Current Coverage Against New Options
Before switching plans, compare what you currently have against what you're considering. Each standardized Medigap plan covers different combinations of costs. Plan A is the most basic and the least expensive. Plan G is one of the most popular mid-level plans. Plan N is another commonly chosen option. Higher-lettered plans generally cost more but cover additional expenses.
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The main costs that Medigap plans cover or don't cover include: Part A coinsurance (hospital costs after Medicare's coverage ends), Part B coinsurance (doctor and outpatient costs), Part B excess charges (amounts doctors can charge above what Medicare approves), blood transfusions, skilled nursing facility coinsurance, hospice care coinsurance, and foreign travel emergencies. Some plans cover all these costs, while others cover none or only some. Plan A covers very few of these costs. Plan G covers all major costs except Part B excess charges.
Look at your actual medical claims from the past year. How many doctor visits did you have? Did you need hospital stays? Did you visit urgent care or emergency rooms? Did you use specialist services? Your pattern of healthcare use should guide which plan makes sense for you. Someone with frequent specialist visits and annual hospitalizations might benefit from a more comprehensive plan even if the premium is higher. Someone who sees their doctor occasionally and stays generally healthy might prefer a lower-premium plan with higher out-of-pocket costs.
Calculate the total annual cost of each plan you're considering. Total cost includes the monthly premium multiplied by 12, plus any deductibles and coinsurance amounts you'd likely pay based on your healthcare history. A plan with a lower premium might result in higher total costs if you end up paying significant coinsurance. A plan with a higher premium might save you money overall if it covers most of your likely medical expenses.
Consider your income level and whether you might be eligible for the Low-Income Subsidy program, sometimes called "Extra Help." This program can reduce your Medicare costs if your income and resources fall below certain thresholds. The income limit for 2024 is $1,416 per month for individuals. If you qualify, your Medigap costs may be reduced through this program.
Practical takeaway: Use the Medicare Plan Finder tool to get actual premium quotes for plans in your area, then calculate your likely total annual cost including premiums and estimated out-of-pocket expenses based on your recent healthcare use.
Medical Underwriting and Pre-Existing Condition Concerns
Outside of guaranteed issue periods, most Medigap switching involves medical underwriting. This is a significant factor in switching decisions. Medical underwriting means the insurance company reviews your health history before deciding to sell you a plan. They look at health conditions you currently have, medications you take, and sometimes even healthcare visits from several years back.
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Based on this review, an insurance company can decline to sell you their Medigap plan. They can also charge you a higher premium than they charge to other people your age in your area, a practice called "health-based rating." This differs from the standard "age-based rating" or "issue-age rating" where your premium is based mainly on your age. If an insurer uses health-based rating and you have conditions like heart disease, diabetes, or cancer, your premium could be significantly higher.
However, it's important to understand that if one insurance company denies you coverage, another may not. Each company has different underwriting standards. Some companies are more lenient about certain conditions. This is where getting quotes from multiple companies becomes important. You might find that Company A declines coverage but Company B accepts you at a reasonable rate, or Company C accepts you but charges more.
Your state may have additional protections for people with pre-existing conditions. Some states have "portability" laws that allow you to keep your current plan's rating if you switch plans within certain timeframes. Other states have "renewal" protections. The specifics vary significantly by state, so checking your state's regulations matters.
If you're declined for Medigap coverage, you have options. You can request an