Illinois Medicare beneficiaries have access to a range of coverage options, state-specific protections, and free counseling services. This comprehensive Illinois Medicare guide covers your SHIP office contacts, Medigap plan availability, birthday rule protections, Medicare Savings Program eligibility, Medicare Advantage options, and how to compare plans. Whether you are turning 65, helping a parent navigate Medicare, or re-evaluating your coverage, understanding Illinois Medicare rules is essential for making informed decisions.
All information in this guide has been verified against official state sources, CMS data, and NAIC reports as of April 2026.
In This Illinois Medicare Guide:
Illinois SHIP — Free Medicare Counseling
Every state has a State Health Insurance Assistance Program (SHIP) that provides free, unbiased Medicare counseling. Illinois’s SHIP program can help you understand your coverage options, compare plans, resolve billing issues, and navigate enrollment periods at no cost.
| SHIP Program | Senior Health Insurance Program (SHIP) |
| Phone | 1-800-252-8966 |
| Website | https://ilaging.illinois.gov/ship.html |
SHIP counselors are trained volunteers and staff who are not affiliated with any insurance company. They do not sell plans. Contact your Illinois SHIP office before making any major Medicare decisions.
Illinois Medigap (Medicare Supplement) Plans
Medigap plans in Illinois help cover out-of-pocket costs not paid by Original Medicare, including the Part A deductible, Part B coinsurance, and skilled nursing facility copays. Medigap plans are standardized by federal law, meaning Plan G from one carrier covers the same benefits as Plan G from another carrier. The difference is premium cost.
Plans available in Illinois: A, B, C, D, F, G, K, L, M, N (Plans C and F available only to those Medicare-eligible before January 1 2020)
Most popular plan: Plan G (45 percent of Illinois Medigap enrollees), followed by Plan F (44 percent) and Plan N (7 percent) is the most popular Medigap plan in Illinois. Plan G covers all gaps in Original Medicare except the annual Part B deductible ($240 in 2026). Plan N is the most popular lower-premium alternative, with small copays for some doctor visits and ER visits.
Pricing method: Illinois uses attained-age-rated Medigap pricing. Premiums increase as you age, which means your costs will rise over time. Buying earlier locks in lower starting premiums.
The average monthly Plan G premium for a 65-year-old in Illinois is approximately $155. Actual premiums vary by carrier, age, gender, tobacco use, and zip code. Always compare quotes from at least three carriers.
Illinois Medigap Birthday Rule
Illinois is one of the few states with a Medigap birthday rule. Effective January 1, 2022, Illinois Medigap enrollees aged 65–75 with an active policy get a 45-day annual open enrollment period starting on their birthday. During this window they can switch to a plan with equal or lesser benefits from their current insurer or any affiliate authorized in Illinois, with no medical underwriting required.
This annual switching window gives Illinois Medicare beneficiaries an opportunity to change Medigap plans without medical underwriting, potentially finding lower premiums or better coverage. Not all states offer this protection.
Illinois guaranteed issue protections: Illinois requires guaranteed issue for all Medigap plans for Medicare beneficiaries under 65 (one of only 15 states). Blue Cross Blue Shield of Illinois and Health Alliance offer year-round guaranteed issue for beneficiaries 65 and older beyond the federal 6-month OEP. The 45-day birthday rule (ages 65–75) also provides annual guaranteed issue for equal or lesser plans from the same insurer or affiliate.
Illinois Medicare Advantage (Part C)
Approximately 2400000 people in Illinois are enrolled in Medicare. About 28 of Illinois Medicare beneficiaries choose Medicare Advantage plans, with the remainder on Original Medicare with or without Medigap supplement coverage.
Medicare Advantage plans in Illinois are offered by private insurers as an alternative to Original Medicare. Most MA plans include prescription drug coverage (Part D) and often add dental, vision, and hearing benefits. However, MA plans use provider networks, which can limit your choice of doctors and hospitals.
Key Medicare Advantage considerations in Illinois:
- Networks matter: HMO plans require you to use in-network providers except in emergencies. PPO plans allow out-of-network care at higher cost.
- $0 premium plans: Many Illinois MA plans have $0 monthly premiums (you still pay your Part B premium).
- Maximum Out-of-Pocket (MOOP): MA plans cap your annual spending, unlike Original Medicare which has no cap.
- Star ratings: CMS rates MA plans 1-5 stars. Higher-rated plans often have lower costs and better coverage.
Top Medicare Advantage carriers in Illinois by enrollment:
- UnitedHealthcare
- Blue Cross Blue Shield of Illinois
- Humana
- Aetna
- Essence Healthcare
Illinois Medicare Financial Help Programs
Illinois offers Medicare Savings Programs (MSPs) that help low-income Medicare beneficiaries pay for premiums, deductibles, and copays. The four programs are:
- QMB (Qualified Medicare Beneficiary): Pays Part A and Part B premiums, deductibles, coinsurance, and copays.
- SLMB (Specified Low-Income Medicare Beneficiary): Pays Part B premiums only.
- QI (Qualifying Individual): Pays Part B premiums (limited funding, first-come first-served).
- QDWI (Qualified Disabled Working Individual): Pays Part A premiums for disabled workers.
Illinois MSP eligibility: QMB: 1330/month individual and 1803/month couple (100 percent FPL); SLMB: 1596/month individual and 2164/month couple (120 percent FPL); QI: up to 1796/month individual and up to 2435/month couple (135 percent FPL). Illinois automatically disregards 25 from income.
Apply through your local SHIP office or your state Medicaid agency for free help determining eligibility.
Top Medicare Insurance Companies in Illinois
Top Medigap carriers in Illinois:
- AARP/UnitedHealthcare
- State Farm
- Mutual of Omaha
- Blue Cross Blue Shield of Illinois
- HealthSpring (Cigna)
When comparing carriers, focus on premium cost (for identical standardized Medigap plans, benefits are the same — only price differs), financial strength ratings from AM Best (A or higher), customer satisfaction ratings, and claims processing speed.
Illinois Medicare Enrollment Periods
Understanding Medicare enrollment deadlines prevents costly late enrollment penalties:
- Initial Enrollment Period (IEP): 7-month window around your 65th birthday (3 months before, birthday month, 3 months after). Enroll in Parts A and B during this period.
- Medigap Open Enrollment: Standard federal 6-month OEP beginning when you are 65 or older and first enrolled in Part B, plus the Illinois 45-day annual birthday rule OEP for ages 65–75. During this period, insurance companies cannot deny you Medigap coverage or charge higher premiums based on health conditions.
- Annual Enrollment Period (AEP): October 15 through December 7 each year. Switch between Original Medicare and Medicare Advantage, change MA plans, or add/change Part D drug plans.
- Medicare Advantage Open Enrollment Period (OEP): January 1 through March 31. Switch MA plans or return to Original Medicare (and add a Medigap plan, subject to underwriting).
- Special Enrollment Periods (SEP): Available when you lose employer coverage, move, or qualify for other life events.
Additional Illinois Medicare protections: 45-day Medigap birthday rule for ages 65–75 effective 2022; guaranteed issue for under-65 Medicare beneficiaries on all Medigap plans; BCBS IL and Health Alliance offer year-round guaranteed issue for 65+; insurers cannot price-discriminate based on health status during birthday rule OEP; genetic information protections for Medigap applicants; 6-month pre-existing condition limitation (claims incurred after 6 months from effective date cannot be denied)
Compare Illinois Medicare Plans
Ready to compare Medicare options in Illinois? Use the official Medicare Plan Finder or contact your local SHIP counselor for free, unbiased help.
Official Sources & Resources
- Medicare.gov: medicare.gov
- Illinois Department of Insurance: https://idoi.illinois.gov
- Senior Health Insurance Program (SHIP): https://ilaging.illinois.gov/ship.html
- CMS.gov: cms.gov
- NAIC: naic.org
This Illinois Medicare guide was last verified against official sources in April 2026. If you notice outdated information, please contact us.