Birthday Rule: What It Means and Why It Matters to You

If you have a Medicare Supplement plan (also known as Medigap), your birthday may offer more cause for celebration. In certain states, the Medicare Birthday Rule can provide an opportunity to review your coverage and switch to a different carrier, potentially lowering your premiums. The Medicare Birthday Rule varies by state. If your state has a birthday rule, this article goes over what you need to know.

What Is the Medicare Birthday Rule?

Eligible Medicare beneficiaries can use the Birthday Rule (if one applies in their state) to switch Medicare Supplement plans around their birthday without going through medical underwriting (known as Guaranteed Issue). Medical underwriting is the process insurance companies use to review your health history when deciding whether to accept an application or charge higher premiums.  

In most states, once your initial Medigap enrollment period ends, insurance carriers can require medical underwriting if you want to change plans. If you have certain health conditions, you may be denied coverage or charged more. The Birthday Rule creates an annual window that bypasses these limitations, making it easier to shop for better rates and coverage.  

Why Was the Birthday Rule Created?

Healthcare needs and insurance costs change over time. That’s why the Birthday Rules were created in various states, to allow beneficiaries a Guaranteed Issue window through which to take advantage of the opportunity to change their supplement carrier and potentially lower their premium.

The Birthday Rule was designed to give beneficiaries greater flexibility and consumer choice. It allows individuals to compare available plans annually and potentially save money without worrying that their health history will prevent them from changing coverage.  

How Does the Birthday Rule Work?

Although details vary by state, the Birthday Rule generally follows a similar process:

1. You must already be enrolled in a Medicare Supplement plan.
2. You must live in a state that offers a Birthday Rule or similar protection.
3. You must apply during your state's birthday window (varies by state).
4. The insurance company must accept your application without medical underwriting if you meet the state's requirements.  

Most states that have a Birthday Rule only allow beneficiaries to switch to a Medigap plan with equal or lesser benefits than their current plan. For example, someone enrolled in Plan G may be able to move to another Plan G with a different carrier or switch to a Plan N, depending on state rules. Moving to a plan with richer benefits, like from a Plan N to a Plan G, may still require underwriting.  

RELATED: Medicare Supplement Plans Explained

Which States Have a Medicare Birthday Rule?

The Birthday Rule is not a federal Medicare benefit. Instead, it is enacted at the state level, meaning availability depends on where you live. As of 2026, approximately 16 states have adopted some form of a Birthday Rule for Medigap policyholders. These include states such as California, Idaho, Illinois, Indiana, Kentucky, Louisiana, Maryland, Nevada, Oregon, and others. Each state establishes its own rules regarding timing, eligibility, and plan-switching options.

Some states allow beneficiaries to switch to a different insurance company, while others require them to stay with their current carrier or an affiliated company. The enrollment window may range from 30 days to 63 days, depending on state regulations.  

Because requirements vary significantly, it is important to review your state's specific guidelines before making any changes to your coverage.

According to Medicare Resources, these states currently have a Birthday Rule. We strongly recommend your agent check specific carrier requirements for Guaranteed Issue guidelines.

• California: You have a 60-day window beginning on the first day of your birth month to switch to a Medigap plan with the same or fewer benefits than your current plan. During this window, you may also switch insurance carriers. This rule took effect on January 1, 2020. ‍
• Delaware: Beginning in 2026, you have a 60-day birthday window that starts 30 days before your birthday and continues for 30 days after your birthday. During this time, you may switch to a Medigap plan with the same or fewer benefits than your current plan and change insurance carriers. ‍
• Idaho: You have a 63-day window beginning on your birthday to switch to a Medigap plan with the same or fewer benefits than your current plan. You may also change insurance carriers. ‍
• Illinois: If you are between ages 65 and 75, you have a 45-day window beginning on your birthday to switch to a Medigap plan with the same or fewer benefits than your current plan. You may only switch to a plan offered by your current carrier or one of its affiliated companies. ‍
• Indiana: You have a 60-day window beginning on your birthday to switch to the same Medigap plan letter offered by another insurance company. For example, if you have Plan G, you may switch to another carrier's Plan G. You may change insurance carriers, but you may not change plan types. ‍
• Kentucky: You have a 60-day window beginning on your birthday to switch to the same Medigap plan letter with another insurance company. You may change insurance carriers, but you may not change plan types. ‍
• Louisiana: You have a 63-day window beginning on your birthday to switch to a Medigap plan with the same or fewer benefits than your current plan. In most cases, you may only switch to a plan offered by your current carrier or one of its affiliated companies. ‍
• Maryland: You have a 30-day window beginning on your birthday to switch to a Medigap plan with the same or fewer benefits than your current plan. You may also change insurance carriers.
• ‍Nevada: You have a 60-day window beginning on the first day of your birth month to switch to a Medigap plan with the same or fewer benefits than your current plan. You may also change insurance carriers. ‍
• New Mexico (Effective January 2027): You will have an annual opportunity to switch to any available Medigap plan with the same or fewer benefits than your current plan without medical underwriting. You may also change insurance carriers. ‍
• Oklahoma: You have a 60-day window beginning on your birthday to switch to a Medigap plan with the same or fewer benefits than your current plan, provided you have not had a Medigap coverage gap of more than 90 days since you first enrolled. You may also change insurance carriers. ‍
• Oregon: You have a 30-day window beginning on the first day of your birth month to switch to a Medigap plan with the same or fewer benefits than your current plan. You may also change insurance carriers. ‍
• Utah: You have a 60-day birthday window to switch to a Medigap plan with the same or fewer benefits than your current plan without medical underwriting. However, the new plan must be offered by your current insurance carrier, so you may not change carriers. ‍
• Virginia: You have a 60-day window beginning on your birthday to switch to the same Medigap plan letter offered by another insurance company. You may change insurance carriers, but you may not change plan types. ‍
• West Virginia: You have a 60-day window beginning on your birthday to switch to a Medigap plan with the same or fewer benefits than your current plan. In most cases, you may only switch to a plan offered by your current carrier or one of its affiliated companies. To qualify, you must have had your current Medigap policy for at least 24 months. ‍
• Wyoming: You have a 63-day window beginning on your birthday to switch to a Medigap plan with the same or fewer benefits than your current plan. You may also change insurance carriers.

Key Benefits of the Birthday Rule

1. No Medical Underwriting: Perhaps the biggest advantage of Birthday Rules is the ability to change plans without health questions. Even if you've developed chronic conditions since enrolling in Medicare, carriers generally cannot deny coverage during the eligible birthday window.
2. Potential Savings: Premiums for identical Medicare Supplement plans can vary considerably between insurance companies. The Birthday Rule allows you to shop for competitive pricing while maintaining similar coverage.
3. Annual Opportunity to Review Coverage: Rather than feeling locked into one plan forever, beneficiaries can evaluate their healthcare needs each year and make adjustments if necessary.  
4. Consumer Protection: The Birthday Rule provides peace of mind by ensuring that changing health conditions do not automatically eliminate future coverage options.

What the Birthday Rule Does Not Cover

While the Birthday Rule is valuable, it does have limitations.

First, it generally applies only to Medicare Supplement (Medigap) plans, not Medicare Advantage plans. Second, many states restrict beneficiaries to plans with equal or lesser benefits. Third, if you miss your state's enrollment window, you may again be subject to medical underwriting requirements.  

Additionally, residents of states without a Birthday Rule may not have annual Guaranteed Issue rights unless they qualify for another special enrollment protection under state or federal law.  

Should You Use Your Birthday Rule Opportunity?

If your state offers a Birthday Rule, it's wise to review your coverage with a licensed agent each year. You may find:

• A lower premium for the same coverage.
• A more competitively priced insurance carrier.
• A plan that better aligns with your healthcare needs.
• Improved long-term value as premiums continue to change.

Working with a licensed agent can help you compare available options and determine whether switching plans makes financial sense. Since benefits for standardized Medigap plans are generally the same regardless of carrier, the decision often comes down to price, service, and long-term rate stability.

Conclusion

The Medicare Birthday Rule is one of the most consumer-friendly protections available to beneficiaries in participating states. It provides an annual opportunity to change Medicare Supplement plans without health qualifications, helping beneficiaries maintain flexibility and potentially reduce healthcare costs.  

If you have a Medigap plan and live in a state that offers the Birthday Rule, mark your calendar. Your birthday could be your chance to secure better Medicare coverage and save money for the years ahead.