What is the California Medigap Birthday Rule?

The California Birthday Rule lets Medicare Supplement (Medigap) enrollees switch to an equal or lesser benefit plan each year, around their birthday, without medical underwriting. That means you can't be denied or charged more based on your health. It's a California consumer protection that lets you shop for a better price on the same coverage annually.

When can I use the Birthday Rule in California?

The window starts on your birthday. California expanded it to 60 days (from the original 30), but you should confirm the current window before relying on it. During that time you can switch to an equal or lesser Medigap plan with any carrier, with no health questions asked.

Can I switch to any Medigap plan under the Birthday Rule?

You can switch to a plan with equal or lesser benefits than your current one - for example, Plan G to Plan G (same benefits, different carrier or price) or Plan G to Plan N (lesser benefits). You generally can't move to a higher benefit level without underwriting. Within those limits, you can choose any carrier offering the plan.

Does the Birthday Rule require medical underwriting?

No - that's the whole point. During your Birthday Rule window, you can switch to an equal or lesser Medigap plan without answering health questions or passing medical underwriting. You cannot be denied or charged more due to pre-existing conditions, which is what makes it so valuable.

Why should I switch Medigap plans if benefits are the same?

Because price isn't the same. Medigap benefits are federally standardized, but premiums for the same plan letter vary significantly by carrier and rise over time. The Birthday Rule lets you move to a lower-priced carrier for identical coverage each year without underwriting - potentially saving hundreds or thousands over retirement. We review this for California clients at no cost.

California Medicare Guide

How Medicare Works New to Medicare / Turning 65 Parts A, B, C, D Advantage Plans Medigap Plans Advantage vs Medigap Enrollment PeriodsBirthday Rule (CA)Costs & Giveback

The California Medigap Birthday Rule (2026)

Key Takeaways

California's Birthday Rule lets you switch to an equal or lesser Medigap plan each year without medical underwriting — you can't be denied or charged more for health.
The window is 60 days starting on your birthday (the rule was expanded — confirm current window when you apply).
You can switch to the same or lower benefit level plan (e.g., Plan G to Plan G, or Plan G to Plan N) with any carrier.
This lets you shop for a better price every year without being locked in by your health.
Only a handful of states have this — it's a real California advantage.

Why Medicare Plan N is Becoming Cheaper than Plan G - Watch on YouTube

The California Birthday Rule is one of the best Medicare consumer protections in the country — and most people don't even know they have it. It lets Medigap enrollees switch plans every year without going through medical underwriting. Here's exactly how it works and how to use it.

What Is the California Birthday Rule?

Switch without underwriting

Around your birthday each year, you get a window to change to an equal or lesser Medigap plan with no health questions — you cannot be turned down or charged more due to your health.

The timing window

The window starts on your birthday and runs 60 days (California expanded the original 30-day window). Always confirm the current window before you count on it.

Equal or lesser benefits

You can move to the same benefit level (Plan G to Plan G) or a lower one (Plan G to Plan N) — with any carrier that offers it.

Shop for a better price

Since Medigap benefits are standardized, this is your annual chance to move to a cheaper carrier for the same coverage.

Why the Birthday Rule Matters So Much

Here's the problem it solves: Medigap premiums for the same plan tend to rise as you age, and carriers raise rates over time. Normally, if you wanted to switch to a cheaper carrier, you'd have to pass medical underwriting — and if you've developed any health conditions, you could be denied or charged more, effectively trapping you in an expensive plan.

The Birthday Rule breaks that trap. Every year, you get a guaranteed chance to shop the market and move to a better-priced plan for the same (or lesser) coverage, regardless of your health. Over a retirement, that can save thousands.

How to Use the Birthday Rule

Step	What to do
1. Note your window	Your window starts on your birthday. Mark it — you have a limited number of days.
2. Compare current pricing	Check what your current plan letter costs from other carriers — prices vary a lot for identical benefits.
3. Switch to equal or lesser	Move to the same or a lower benefit level plan at a better price. No health questions.
4. Confirm no coverage gap	Time the switch so your new plan starts as the old one ends.

We watch this for our California clients

Most people never use the Birthday Rule simply because they don't know about it or forget the window. That's money left on the table every year. As your California Medicare agents, we can review your Medigap pricing around your birthday and tell you whether switching saves you money — and handle the switch if it does. There's no cost for this. It's exactly the kind of ongoing value that makes having a local agent worthwhile. Learn more about Medigap plans or the full Medicare picture.