Illinois Medicare Supplement Birthday Rule 2027: Ages 65 to 75, 45 Days, Same Insurer Family

Reviewed by Russell Noga, Licensed Medicare Insurance Broker (all 50 states) — Last updated October 27, 2026

Illinois wrote its birthday rule in 2021, and lawmakers trimmed it hard before it passed. The version on the books gives a narrower right than the bill as first written: a shorter window, an age ceiling and a requirement that you stay inside your current insurer’s corporate family. That design shapes every decision an Illinois Medigap holder makes about switching.

This guide reads the rule straight from Section 363(8) of the Illinois Insurance Code, follows the 2024 amendment that widened it, runs a dated 2027 example and lays out the state’s other Medigap protections that work alongside it.

Illinois puts the rule in one paragraph of 215 ILCS 5/363. To use it, you need two things on your birthday: an age of at least 65 but no more than 75, and an existing Medicare Supplement policy. Read literally, the window that opens on your 75th birthday is the last one, since at 76 you are past the ceiling.

Once you qualify, the statute bars the insurer from denying or conditioning your new coverage because of health status, claims experience, receipt of health care or a medical condition. It also says the company can’t discriminate in pricing for those reasons, so a recent diagnosis can’t push you into a higher rate class during the window. Normal age-based pricing still applies.

Senate Bill 147, sponsored by Sen. Laura Murphy, was filed as a near copy of California’s rule: a window of 60 days or more from your birthday, and a notice from your insurer 30 to 60 days before it opened. Senate Floor Amendment No. 1, adopted May 6, 2021, rewrote it. The amendment added the 65-to-75 age band, cut the window to 45 days, limited the switch to the same issuer and moved the notice to the time you first apply for a policy.

Gov. Pritzker approved the bill on July 23, 2021 as Public Act 102-0142, effective January 1, 2022. The next change came through Senate Bill 56, sponsored by Sen. Laura Fine and approved August 2, 2024 as Public Act 103-0747. It took effect January 1, 2026 and lets you move to any affiliate of your insurer that is authorized to do business in Illinois, not only the company on your current policy.

Some consumer sites still describe the Illinois rule as same company only. That was accurate through 2025; it isn’t for a 2027 birthday.

Many large Medigap brands sell through more than one licensed company. Before 2026, a policyholder could only reprice inside the exact company named on the policy. Now the same protected switch can land on a sister company in the same group, which may file different rates in Illinois for the same plan letter.

The test is benefits equal to or lesser than your previous coverage. The statute doesn’t list plan pairs, so the rows below apply that test to today’s standardized letters; confirm any unusual move with the insurer first.

If a step down is on your mind, our guides to switching from Plan F to Plan G and Medicare Supplement Plan N show what you give up.

Take a 70-year-old in Peoria with Plan G who turns 70 on March 10, 2027 and learns that a sister company of her insurer files a lower Plan G rate in her ZIP code. Counting the birthday as the first of the 45 days, her window runs March 10 through April 23, 2027.

The savings are illustrative: if the affiliate’s Plan G ran $20 a month less, she’d keep $240 a year, before any future rate changes at either company.

The birthday window is one of several Medigap clocks in Illinois law, and they don’t overlap in purpose. Your first Medicare Supplement open enrollment period lasts six months from Part B and lets you pick any company and any plan. Subsection (9) of Section 363 adds at least 63 days of guaranteed issue for certain people whose state medical assistance ended after the COVID-19 emergency, if they show proof of the termination.

Every new policy also comes with a 30-day Medicare Supplement free look period. That matters after a birthday switch: if the new policy disappoints, you can return it for a refund, but if the old policy has already ended, returning the new one leaves you with no Medigap at all.

Illinois protects disabled Medicare enrollees under 65 more than many states, just not through the birthday rule. Insurers must accept them within six months of Part B enrollment, can’t charge them more than the company’s highest filed rate for people 65 and older, and since June 16, 2023 must make every policy they sell available to them regardless of age or a Part B late penalty. At 65 they get a second six-month open enrollment.

Medicare Advantage members can’t use the birthday window, because they have no Medigap policy to switch from. House Bill 4330, filed in the 104th General Assembly, would bar insurers from denying people who voluntarily leave Medicare Advantage and apply within 30 days, but it was re-referred to the House Rules Committee on March 27, 2026 and isn’t law. Today the federal Medigap trial right and the events in open enrollment vs. guaranteed issue are the main routes back.

Compared with California’s rule, Illinois gives 15 fewer days, caps eligibility at age 75 and keeps you inside your insurer’s family, while California lets you move to any company and requires your insurer to send notice 30 to 60 days before each window. Our California Medicare Supplement birthday rule page covers that version in full.

Louisiana (current insurer or affiliates) and Utah (current insurer only) are the closest matches. To see where Illinois sits among all states, including year-round and anniversary rules, read Medicare Supplement guaranteed issue rights by state. If the price you’re fleeing comes from a large increase, our guide to Medicare Supplement rate increases explains what drives increases and how to compare companies’ histories.

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