Turning 65 in California? Your Complete Initial Enrollment Period Guide

Turning 65 is exciting—and a little overwhelming when it comes to Medicare. You've heard it's complicated, and your friends have given you conflicting advice. Here's what you need to know: Medicare doesn't have to be confusing. You just need to understand one important concept: the Initial Enrollment Period.

The Initial Enrollment Period (IEP) is your 7-month window to enroll in Medicare without penalties. Miss it, and you could pay more for Medicare for life. Get it right, and you'll be set up with coverage that actually works for you and your California lifestyle.

This guide walks you through the IEP step by step, explains your choices, and gives you the California-specific information you need to make the right decision for you.

What Is the Initial Enrollment Period?

The Initial Enrollment Period is your first real chance to sign up for Medicare. It's a 7-month period that works like this:

• 3 months before your 65th birthday month
• Your birth month
• 3 months after your birth month

Let's say you turn 65 on August 15. Your IEP starts May 1 and ends November 30. That's a 7-month window.

It's important to understand that the IEP is not like the Annual Enrollment Period (October 15 to December 7) that happens every year for people already on Medicare. The IEP is your one-time opening to get on Medicare without delay penalties.

Understanding Part A and Part B

Medicare has different parts. When you turn 65, you mainly need to understand Part A and Part B.

Medicare Part A (Hospital Insurance)

Part A covers inpatient hospital stays, skilled nursing facility stays, hospice care, and some home health services. Here's the great news: if you worked for at least 10 years and paid Medicare taxes, Part A is free. You don't pay a monthly premium.

You do pay a deductible when you're admitted to the hospital ($1,556 in 2026), but many people think having coverage is worth it. You'll automatically get Part A when you turn 65 if you're already collecting Social Security. If you haven't started Social Security, you need to enroll in Part A.

Medicare Part B (Doctor and Outpatient Care)

Part B covers doctor visits, tests, and outpatient care. Part B has a monthly premium (usually around $175 in 2026, though it varies based on your income). Most people need Part B, and this is where many Medicare decisions happen.

Part B also has an annual deductible ($240 in 2026) and then Medicare pays 80% of approved costs while you pay 20%. This is called coinsurance, and it's where an extra insurance plan (like Medigap) becomes really important.

The Late Enrollment Penalty Explained

This is crucial: if you delay enrolling in Part B and you don't have employer coverage, you'll pay a permanent 10% penalty on top of your Part B premium for each 12-month period you could have had it.

Here's an example: Let's say you turn 65 in January but don't enroll in Part B until March of the following year. That's 14 months you could have had coverage. You qualify for a 10% penalty (for one 12-month period) or possibly more. Let's say your Part B premium would be $175. Now you'll pay $192.50 every month, for the rest of your life, permanently.

For many people, this penalty is thousands of dollars over a lifetime. It's not a refundable penalty or something that goes away. Once you're stuck with it, you're stuck with it.

When You Don't Have to Worry About This Penalty

If you're still working and have health insurance through your employer, you have what's called "creditable coverage." You can delay enrolling in Part B without penalty, as long as you enroll within 8 months of losing that employer coverage. The key word is "within"—eight months, not a day longer.

California employers with 20 or more employees must offer health insurance to workers age 65 and over, so many working Californians have this protection. If you work for a small business, ask your HR department about your coverage and this deadline.

Registering for Social Security and Medicare

Most people handle Medicare and Social Security together, which makes sense since they're intertwined. Here's how it typically works:

• If you're already collecting Social Security: You'll automatically get enrolled in Part A and Part B at 65. Medicare will contact you with your options.
• If you haven't started Social Security yet: You need to actively enroll in Medicare. You can do this through Medicare.gov, by calling 1-800-MEDICARE, or with help from a Medicare counselor.

One strategy some people use: wait to collect Social Security if you don't need the money yet, because your Social Security benefit grows the longer you wait (up to age 70). But go ahead and enroll in Medicare at 65 to avoid penalties. These are two separate systems, and you don't have to do them at the same time.

Medicare Advantage vs. Original Medicare + Medigap

This is the big decision facing anyone turning 65. It's also the decision where getting it right can save you thousands of dollars. Let's walk through both options:

Medicare Advantage (Plan C, D, F, etc.)

Medicare Advantage is an alternative to Original Medicare. Here's how it works:

• What it is: A private insurance plan approved by Medicare that covers all of Part A and Part B, usually with lower or no monthly premiums.
• How it works: You pay a copay each time you visit the doctor ($30-$50 for a doctor visit). You pay separate copays for specialists, imaging, labs, and hospital visits.
• The network: You typically must use doctors in the plan's network. Out-of-network care is either covered at a higher cost or not covered at all.
• Prescription drugs: Usually included in the plan.
• Extra benefits: Many plans offer dental, hearing, vision, or gym memberships.

Best for: People who are generally healthy, don't visit specialists frequently, and want lower upfront costs with the ability to plan their spending (knowing exactly what each visit costs).

Watch out for: Your out-of-pocket costs can add up if you have a lot of doctor visits or multiple specialists. Plus, if you move out of your plan's service area, you need to change plans. And if your doctor leaves the network, you may need to switch plans too.

Original Medicare + Medigap

Original Medicare is what most people think of when they hear "Medicare." You get Part A and Part B. Then you add two other pieces:

• Medigap (Supplemental Insurance): This private insurance covers what Original Medicare doesn't—mainly the copays and coinsurance you'd otherwise pay.
• Part D (Prescription Drug Coverage): You enroll separately in a prescription drug plan.

Best for: People who want to see any doctor they want (no network restrictions), prefer predictable costs, see specialists, or have specific medication needs.

Watch out for: Your total monthly premiums (Part B + Medigap + Part D) will likely be higher than a Medicare Advantage plan, often $300-$450 per month or more, depending on which Medigap plan you choose.

California-Specific Medigap Advantages

If you choose Original Medicare and Medigap, California has some excellent protections that other states don't have.

Guaranteed Issue Rights

When you turn 65 and enroll in Original Medicare and Part B, you have 6 months of guaranteed issue rights in California. This means any insurance company must sell you any Medigap plan they offer. They cannot:

• Deny you coverage
• Charge you more because of pre-existing conditions
• Make you wait to start coverage
• Ask health questions

This is huge. It means you can choose the Medigap plan that's best for you without worrying about being rejected or penalized for your health history. Many states don't have this protection.

The Birthday Rule

California has what's called the "birthday rule" for Medigap rate increases. Insurance companies can only raise your Medigap premium once per year, in the month of your birthday. This gives you predictability and prevents surprise rate hikes during the year.

Rate Protections for Seniors Over 75

California limits how much Medigap rates can increase for people over 75. This means your rates grow more slowly as you age compared to states without this protection. For seniors staying on Medigap for decades, this protection is valuable.

California Medigap Plan Options

California offers all the standard Medigap plans: Plan A, B, C, D, F, G, K, L, M, and N. The most popular with new retirees are plans F and G (most comprehensive coverage) or plan A (lower premium, higher out-of-pocket costs). Work with a Medicare counselor to understand which plan fits your needs and budget.

Month-by-Month IEP Checklist

Here's what to do in each phase of your Initial Enrollment Period:

Three Months Before Your Birthday Month

To-Do:

• Research what Medicare Advantage plans are available in your ZIP code
• Check whether your doctor accepts each plan
• List your current medications and check plan formularies
• Gather your Social Security number and Medicare number (if you have one)
• Start thinking about whether you want Medicare Advantage or Original Medicare + Medigap
• Call us or a Medicare counselor to discuss your options

Your Birthday Month

To-Do:

• Finalize your decision: Medicare Advantage or Original Medicare + Medigap?
• If Medicare Advantage: choose your specific plan
• If Original Medicare: enroll in Part A and Part B
• If Original Medicare: choose your Medigap plan during your guaranteed issue window
• Enroll in Part D prescription drug coverage (or in your Medicare Advantage plan's included drug plan)

Three Months After Your Birthday Month

To-Do:

• Make sure all enrollments went through—check Medicare.gov for confirmation
• Wait for your Medicare card in the mail
• Notify your doctor's office of your Medicare information
• Set up a pharmacy file with your Medicare information
• Review all your enrollment confirmations

Critical: Do not wait until the very last day of your IEP to enroll. Medicare processing takes time, and you want your coverage to start on your 65th birthday, not weeks later. Aim to enroll at least 2 weeks before your birthday.

Special Situations: Still Working at 65?

If you're still working and your employer offers health insurance to workers age 65 and over, you have options.

Scenario 1: You're Satisfied With Your Employer Coverage

You can delay enrolling in Medicare without penalty as long as your employer coverage continues. However, you need to enroll in Medicare within 8 months of losing that coverage. Mark this deadline in your calendar—it creeps up fast when you retire.

Important: This only works if your employer coverage is "creditable"—it meets certain standards. Ask your HR department about this specifically.

Scenario 2: Your Employer Coverage is Ending Soon

If you know your employer will drop your coverage at a specific date, start the Medicare enrollment process at least a month before that date. You want Medicare to start the same day your employer coverage ends to avoid gaps.

Scenario 3: You Want to Enroll in Medicare Now and Keep Working

You can do this. You'll have both Medicare and your employer coverage. This is called "creditable coverage," and Medicare will coordinate with your employer plan. Just make sure to inform Medicare about your employer coverage when you enroll.

Where to Enroll

You have three main options for enrolling in Medicare during your IEP:

Online: Medicare.gov

The easiest option for many people. Create an account, log in, and follow the enrollment wizard. It takes about 30 minutes. You'll get immediate confirmation.

By Phone: 1-800-MEDICARE

Call Medicare at 1-800-633-4227 and speak with a representative. You can ask questions as you go. The call takes about 20-30 minutes. Have your Social Security number and any employer information ready.

With a Licensed Medicare Counselor

You can work with someone like our team at Medicare California who can walk you through your options, explain your California-specific benefits, and help you choose the right plan. We're licensed, we know California plans deeply, and we're here to help you feel confident in your decision.

Many California seniors choose this option because it takes the stress out of the process. You're not alone in making this decision, and you don't have to figure it out yourself.

What Happens After You Enroll

Once you enroll during your IEP, here's the timeline:

• Immediately: You get enrollment confirmation online or by mail
• By your 65th birthday: Your Medicare coverage starts (Part A and B, or Medicare Advantage)
• Within 1-2 weeks: Your Medicare card arrives in the mail
• Within 1 week: Your Medigap or Medicare Advantage plan details arrive (if applicable)
• By the 15th of the month after you enroll: Your Part B or Medicare Advantage premium starts being deducted from your Social Security check (or you'll get a bill if you're not on Social Security yet)

Common Mistakes to Avoid

We've seen hundreds of California seniors turn 65, and we've learned from watching what goes wrong. Here are the mistakes to avoid:

Waiting Too Long to Enroll

If you enroll in October when your birthday is in November, you're cutting it close. Medicare needs time to process, and you want your card before your birthday. Enroll early in your IEP.

Forgetting About Part D

Part D (prescription drugs) is its own enrollment. If you don't enroll in Part D during your IEP and you don't have creditable coverage, you pay a penalty for every month you're late. This penalty is permanent and often equals 1% of the national average Part D premium for each month you're late.

Assuming Your Doctor Is In-Network

Never assume your doctor is in a Medicare Advantage plan's network. Call your doctor's office and verify, or search the plan's website. A plan is only valuable if your doctor participates.

Not Understanding Your Out-of-Pocket Maximum

With Medicare Advantage, your out-of-pocket maximum is important. It's the maximum you'll pay in a year for covered services. Once you hit it, the plan pays 100% of covered costs. Make sure you understand this number for any plan you choose.

Switching Plans Without Understanding Guaranteed Issue

If you choose Original Medicare and Medigap, your 6-month guaranteed issue window is precious. Don't waste it. If you later switch back to Medicare Advantage and then back to Medigap, you won't have guaranteed issue rights, and insurers can deny you or charge you more. Think carefully before switching.

Your IEP Questions Answered

I just turned 65 and didn't enroll. Is it too late?

It depends. If you're still within your 7-month IEP, you can still enroll without penalty (though you may have a gap in coverage). If you're past your IEP, you'll have to wait for the next Annual Enrollment Period (October 15 - December 7), and you'll face late enrollment penalties. Act immediately if you're past your IEP.

My spouse is 65 but I'm not yet. What do we do?

Each person has their own IEP based on their birth month. Your spouse needs to enroll in Medicare during their IEP. You'll enroll when you turn 65. Your enrollment decisions don't have to be the same—you can each choose different plans.

Do I lose my employer health insurance when I turn 65?

Not automatically. If your employer offers coverage to workers 65 and over, you can keep it. However, once you enroll in Medicare, Medicare becomes your primary insurance and your employer plan becomes secondary. Let your HR department know when you enroll in Medicare so they can coordinate benefits correctly.

Can I change my mind after I enroll?

You have limited options. If you enroll in a Medicare Advantage plan during your IEP and change your mind, you can switch to Original Medicare during your IEP, or wait for the next Annual Enrollment Period. If you enroll in Original Medicare + Medigap and want to switch to Medicare Advantage, you'll have to wait for Annual Enrollment Period. Plan carefully before you enroll.

What if I don't live in California for part of the year?

Medicare works nationwide, so you're covered wherever you are. However, Medicare Advantage plans have specific service areas, so if you split time between California and another state, Original Medicare + Medigap might be better because it works nationwide. Talk to us about this decision if it applies to you.

Final Thoughts

Turning 65 is a big deal. Medicare is part of that transition, and we understand it can feel overwhelming. But here's what we know after helping hundreds of California seniors through this: your IEP is your friend. It's a 7-month window to make a thoughtful, informed decision without rush.

Take your time. Research your options. Talk to a Medicare counselor—that's what we're here for. And remember, you have California-specific protections and benefits that many other states don't. Use those to your advantage.

Susana and Alejandra at Medicare California are here to help make this easier. We're a mother-daughter team based right here in California, and we've guided hundreds of people through exactly what you're going through. Call us anytime during your IEP. We'll help you make the right choice.