If you already have a Medicare Supplement (Medigap) plan and live in one of about 10 states, the birthday rule gives you an annual window to switch to a different plan or carrier without answering a single health question. If you don’t already have a Medigap policy, this rule doesn’t apply to you yet — it’s a switching right for existing policyholders, not a way to get your first Medigap plan without underwriting.
Here’s how it works, which states offer it, and how the rules differ from state to state.
What the Medicare birthday rule actually does
Under federal law, most people get exactly one guaranteed-issue window to buy a Medigap plan without medical underwriting: the six-month period that starts when they turn 65 and enroll in Medicare Part B. Once that window closes, insurers in most states can ask health questions, charge more, or decline you outright if you want to switch plans later.
The birthday rule is a state-level exception to that. In states that have adopted it, current Medigap policyholders get a recurring window each year — tied to their birthday — during which they can switch to a different plan or carrier without any medical underwriting. If your health has changed since you first enrolled, this is often the only way to access a lower premium without being medically re-evaluated.
The most important requirement: you must already have Medigap coverage
This is the detail people miss most often. The birthday rule is not a way to buy your first Medigap policy without underwriting — it only applies if you already have an active Medicare Supplement plan in place.
If you’ve never had Medigap coverage, or you let a previous policy lapse, the birthday rule doesn’t help you. You’d need to either qualify for your one-time federal guaranteed-issue window (typically at 65), qualify under a separate guaranteed-issue trigger (like losing employer coverage), or apply subject to medical underwriting. The birthday rule is purely a switching mechanism for people already in the Medigap system.
Which states offer the birthday rule
As of 2026, roughly 10 states have adopted some version of the birthday rule: California, Oregon, Nevada, Idaho, Oklahoma, Maryland, Delaware, Indiana, Utah, and Virginia. New Mexico has passed birthday rule legislation that takes effect January 1, 2027.
A handful of other states — Connecticut, New York, Maine, and Vermont among them — take a different approach and offer year-round guaranteed-issue rights rather than a birthday-specific window, meaning Medigap policyholders there can switch plans at any time without underwriting.
How the rules differ from state to state
The core concept is the same everywhere the birthday rule exists, but the specifics vary quite a bit — window length, which plans you can switch to, and whether you can change carriers or only switch within your current insurer.
| State | Window | Can You Switch Carriers? |
|---|---|---|
| California | 60 days, starting on your birthday | Yes, any carrier |
| Oregon | 30 days before to 30 days after your birthday | Yes, any carrier |
| Nevada | 60 days, starting the 1st of your birthday month | Yes, any carrier |
| Idaho | 63 days, starting on your birthday | Yes, any carrier |
| Delaware | 30 days before to 30 days after your birthday | Yes, any carrier |
| Indiana | 31 days before to 31 days after your birthday | Yes, any carrier |
| Maryland | 30 days from your birthday | Varies |
| Oklahoma | 60 days from your birthday | Varies |
Utah and Virginia have also adopted birthday rule protections; exact window details vary and should be confirmed with your state insurance department, since these rules are updated periodically.
The rule that applies everywhere: equal or lesser benefits only
Regardless of which state you’re in, the birthday rule almost universally restricts you to switching into a plan with equal or lesser benefits than what you currently have. That means if you have Plan G, you can switch to another carrier’s Plan G, or move down to Plan N — but you generally cannot use the birthday rule to upgrade from Plan N up to Plan G. An upgrade like that would typically require medical underwriting, even during your birthday window.
This is why the birthday rule is primarily a tool for finding a better rate on the coverage you already have, not a way to get more comprehensive coverage without underwriting.
Same carrier vs. any carrier: why this distinction matters
Most of the states listed above — California, Oregon, Nevada, Idaho, Delaware, and Indiana among them — let you shop your birthday window across any carrier licensed in the state. That’s meaningfully more valuable, because it means you can move to whichever company currently offers the most competitive rate for your plan letter.
A smaller number of states restrict you to switching within your same carrier or its affiliates. That still lets you access a potentially lower-priced version of your plan if your carrier has one, but it doesn’t let you shop the broader market the way the any-carrier states do.
If you’re not sure which category your state falls into, this is exactly the kind of detail an independent broker can confirm quickly.
Common mistakes that can cost you the window
Canceling your old policy too early. Never cancel your current Medigap plan until your new policy has actually been issued and is in writing. Applications inside a guaranteed-issue window can still be delayed or flagged, and canceling early can leave you with a coverage gap.
Trying to upgrade benefits. Attempting to move to a richer plan than what you currently have will typically trigger health questions, defeating the purpose of using the birthday rule in the first place.
Missing the window. These windows are short — often 30 to 63 days — and in most states they don’t repeat until your next birthday. Mark your calendar well in advance.
Assuming your state has the rule when it doesn’t. If you don’t live in one of the states listed above, the birthday rule simply isn’t available to you. You’d need to rely on other guaranteed-issue triggers or a year-round guaranteed-issue state’s rules if you live in one of those.
What if your state doesn’t have a birthday rule?
If you’re not in one of the states above, you’re not necessarily stuck — but your options are more limited. Connecticut, New York, Maine, and Vermont offer year-round guaranteed-issue rights that go even further than a birthday window. Outside of those states, you may still qualify for a guaranteed-issue right under specific triggering events (losing employer coverage, your carrier leaving the market, moving to a new service area), or you can apply for a new Medigap plan subject to medical underwriting, which may still result in approval depending on your health.
Our guide on the Medicare Birthday Rule explained covers the broader guaranteed-issue landscape in more detail if you want the fuller picture.
Get help using your birthday rule window
At Term Insurance Brokers, we’re licensed independent insurance agents who help Medigap policyholders use their birthday rule window every year to find a better rate without underwriting. We’ll confirm your state’s specific rules, shop the market where that’s allowed, and make sure your new policy is properly in force before anything with your old one changes.
There’s no cost for a review and no obligation.
Get Your Free Medicare Review
No cost. No obligation. We’ll confirm your state’s rules and shop the market.
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Term Insurance Brokers is a team of licensed independent insurance agents operating in 35+ states, based in Las Vegas, Nevada. We are not affiliated with any single insurance company. State rules described above reflect information available as of August 2026 and are subject to change; confirm current details with your state insurance department or your broker before acting.