What Are the Best Medicare Supplement Plans in Illinois?
If you have Original Medicare (Parts A and B), you already know it doesn't cover everything. Copays, deductibles, and coinsurance can add up fast. That's where Medicare Supplement plans — also called Medigap — come in. They help pay the gaps that Original Medicare leaves behind.
Illinois residents have access to the same standardized Medigap plans sold across most of the country, but prices and carrier options vary by ZIP code. This guide breaks down the most popular plans, what they cover, and how to find the right fit for your budget and health needs.
How Medicare Supplement Plans Work in Illinois
Medicare Supplement plans are sold by private insurance companies but are regulated by the federal government. Every plan with the same letter (like Plan G) offers the exact same benefits no matter which company sells it. The only real difference between carriers is the monthly premium you pay.
In Illinois, plans are overseen by the Illinois Department of Insurance. You can enroll in a Medigap plan if you are 65 or older and enrolled in Medicare Parts A and B. Illinois also has some of the strongest consumer protections in the country — for example, the state requires a continuous open enrollment period for people under 65 who qualify for Medicare due to disability, which not all states mandate.
The Most Popular Medicare Supplement Plans in Illinois
There are up to 10 standardized Medigap plans (A, B, C, D, F, G, K, L, M, N). In Illinois, three plans stand out as the most commonly chosen:
Plan G
Plan G is the most comprehensive option for people newly eligible for Medicare (those who turned 65 on or after January 1, 2020, are not eligible for Plan F). It covers:
- Medicare Part A coinsurance and hospital costs
- Medicare Part B coinsurance or copayments
- Part A hospice care coinsurance
- Skilled nursing facility coinsurance
- Part A deductible
- Foreign travel emergency care (up to plan limits)
The only out-of-pocket cost you pay is the annual Part B deductible ($240 in 2024). After that, Plan G covers virtually everything else Medicare approves.
Plan N
Plan N is a lower-premium alternative to Plan G. You still get strong coverage, but you share a bit more cost:
- Up to $20 copay for some office visits
- Up to $50 copay for emergency room visits (waived if admitted)
- You pay the Part B deductible
- Does not cover Part B excess charges
Plan N works well for people who are generally healthy and don't mind small copays in exchange for a lower monthly premium.
High-Deductible Plan G
This version of Plan G has a lower monthly premium but requires you to pay a higher deductible before the plan kicks in (the 2024 deductible is $2,800). It's a good fit for people who want catastrophic protection but are comfortable paying routine costs out of pocket.
What Do Medicare Supplement Plans Cost in Illinois?
Premiums vary based on your age, ZIP code, tobacco use, and the insurance company you choose. As a general range, Illinois residents can expect:
- Plan G: Roughly $90–$200+ per month for a 65-year-old non-smoker (varies widely by region and carrier)
- Plan N: Typically $70–$160+ per month
- High-Deductible Plan G: Often $30–$80 per month
These are general estimates — actual quotes will differ. Always compare at least three carriers before enrolling. Start a free comparison here.
Insurance companies in Illinois can use three pricing methods:
- Community-rated (everyone pays the same regardless of age)
- Issue-age-rated (price is based on your age when you buy)
- Attained-age-rated (price increases as you get older)
Community-rated and issue-age-rated plans often save money in the long run, even if the starting premium looks slightly higher.
When Can You Enroll in a Medigap Plan in Illinois?
The best time to enroll is during your Medigap Open Enrollment Period — the 6-month window that starts the month you turn 65 and are enrolled in Medicare Part B. During this window, insurance companies cannot deny you coverage or charge you more based on pre-existing health conditions.
Outside of open enrollment, carriers can use medical underwriting, which means they can turn you down or charge higher rates based on your health history. Illinois does offer some additional protections for people losing other coverage, but the open enrollment window is still the safest time to act.
Medicare Supplement vs. Medicare Advantage: What's the Difference?
Many Illinois residents compare Medigap to Medicare Advantage (Part C). Here's a quick breakdown:
| Feature | Medigap | Medicare Advantage | |---|---|---| | Works with | Original Medicare | Replaces Original Medicare | | Network restrictions | No — see any Medicare provider | Usually yes — HMO or PPO networks | | Monthly premium | Higher | Often $0 or low | | Out-of-pocket costs | Low once deductible met | Varies — can be higher if you use services | | Prescription drug coverage | No (need Part D separately) | Usually included |
Neither is universally "better" — it depends on your health, finances, and how often you use medical services. Talk to our AI intake tool to explore your options.
FAQ: Medicare Supplement Plans in Illinois
H3: Can I be denied a Medigap plan in Illinois?
During your open enrollment period, no — insurers must accept you. Outside that window, they can use medical underwriting and may deny coverage or charge more based on health history. Illinois does have guaranteed issue rights in certain situations, such as losing employer coverage.
H3: Does Illinois have any special Medigap rules?
Yes. Illinois requires insurers to offer open enrollment to Medicare-eligible people under 65 with disabilities, which is not required in every state. The Illinois Department of Insurance also provides free counseling through the Illinois Senior Health Insurance Program (SHIP).
H3: Is Plan F still available in Illinois?
Plan F is only available to people who were eligible for Medicare before January 1, 2020. If you became eligible after that date, you cannot enroll in Plan F or Plan C. Plan G is now the most comparable option.
H3: Do Medicare Supplement plans cover prescription drugs?
No. Medigap plans do not include prescription drug coverage. You would need to enroll in a separate Medicare Part D plan to cover medications.
H3: How do I compare Medigap prices in Illinois?
You can use the official Medicare Plan Finder at medicare.gov, contact Illinois SHIP for free help, or use an independent broker who can quote multiple carriers at once. Comparing at least three to five carriers is recommended before making a decision.
Choosing the right Medicare Supplement plan is one of the most important financial decisions you'll make in retirement. The "best" plan depends entirely on your health needs, budget, and how much predictability you want in your medical costs.
Talk to our 24/7 AI to see if you have a strong case — free, no obligation. → Start free intake