Medicare Supplement

Palmdale at 65: the one Medigap window California retirees can't get back

PALMDALE, Calif. — If you are approaching 65 in the Antelope Valley, there is one Medicare deadline that quietly matters more than the ones you see advertised every fall. It is the six-month Medigap Open Enrollment Period, and it opens the first month you are both 65 and enrolled in Medicare Part B. During those six months, an insurance company selling Medigap in California must sell you any policy it offers, at its best available rate for your age, without asking about your health history. After the window closes, that guarantee goes away for most people.

What the six-month window actually is

Medigap — also called Medicare Supplement Insurance — is a private policy that helps pay some of the out-of-pocket costs Original Medicare leaves behind, like coinsurance and copays. The policies are standardized by the federal government and labeled with letters (Plan A, Plan G, Plan N, and so on).

Under federal rules, your Medigap Open Enrollment Period begins the first month you are 65 or older AND enrolled in Medicare Part B. It lasts six months. During that time you have what's called a "guaranteed issue right": any insurer offering Medigap in your area must sell you a policy, cannot use your health to raise your price, and cannot turn you down.

This is the only window every person gets automatically. Miss it, and the rules change.

Why this window is different from AEP

Many people confuse this with the Medicare Annual Enrollment Period (October 15 – December 7) or the Medicare Advantage Open Enrollment Period (January 1 – March 31). Those are for Medicare Advantage and Part D drug plans, and they come back every year.

Your Medigap Open Enrollment Period does not come back. It opens once, based on your own birthday and Part B start date, and then closes for good.

What changes after the six months end

Once your window closes, insurers in most states — including California — can use medical underwriting when you apply for Medigap. That means they can:

• Ask about your health history and current conditions
• Charge you a higher premium based on your health
• Delay coverage for pre-existing conditions
• Turn down your application entirely

California does offer some added protections, including a "birthday rule" that lets existing Medigap enrollees switch to certain policies each year around their birthday without new underwriting. But the birthday rule works with policies you already have — it is not a substitute for the one-time federal window that opens at 65.

There are also limited "guaranteed issue" situations later in life, such as losing certain employer coverage. Those are narrow and time-sensitive, so they are not something to count on.

How this fits with plan choices in Palmdale

Palmdale is in Los Angeles County, where Medicare beneficiaries can choose between staying with Original Medicare (often paired with a Medigap policy and a stand-alone Part D drug plan) or enrolling in a Medicare Advantage plan. Medigap policies only work alongside Original Medicare — you cannot use one with a Medicare Advantage plan.

That is why the six-month window matters even if you are leaning toward Medicare Advantage today. If you ever want to switch from Advantage back to Original Medicare later and add a Medigap policy, you may face underwriting at that point. Knowing that up front helps you plan.

Program facts worth knowing for 2026

While you're weighing your options at 65, a few 2026 numbers are worth keeping in view:

• Part D has a $2,100 annual out-of-pocket cap for covered prescriptions.
• The Part D maximum deductible is $615.
• The old coverage gap (the "donut hole") was eliminated in 2025; Part D now has three phases.
• The Medicare Prescription Payment Plan lets you spread drug costs across the year in monthly amounts.
• Income-related premium surcharges (IRMAA) begin above $109,000 for a single filer.

These figures affect drug coverage and premiums, not Medigap directly, but they shape the full picture of what your Medicare costs may look like.

Where to get personal help

Medigap decisions depend on your health, your budget, and how you want to use your coverage. For unbiased help in Palmdale, you have three good options:

• Medicare.gov — official plan information and Medigap policy comparisons.
• 1-800-MEDICARE (1-800-633-4227) — 24/7 help from Medicare directly.
• California's SHIP program (HICAP) — free one-on-one Medicare counseling from trained volunteers, available to Los Angeles County residents.