Turning 65 in California: Your Complete Medicare Enrollment Guide

Turning 65 in California is a milestone. It's the age when most people become eligible for Medicare, the federal health insurance program. But signing up isn't automatic for everyone, and signing up late can cost you money every month for the rest of your life. This guide explains everything you need to know: your Initial Enrollment Period (IEP), the parts of Medicare, your options, and California-specific assistance programs.

What is the Initial Enrollment Period (IEP)?

The IEP is a 7-month window centered on the month you turn 65:

• 3 months before the month you turn 65
• The month you turn 65
• 3 months after the month you turn 65

Example: if you turn 65 on July 15, 2026, your IEP runs April 1 to October 31, 2026.

Enroll in the first 3 months so coverage starts on the first day of your birthday month. Waiting until your birthday month or later delays coverage by 1 to 3 months and may leave a gap.

The Parts of Medicare

Part A: Hospital Insurance

Covers hospital stays, skilled nursing care, hospice, and some home health services. Most people pay no premium if they or their spouse worked and paid Medicare taxes for at least 10 years (40 quarters).

Part B: Medical Insurance

Covers doctor visits, outpatient services, durable medical equipment, and preventive care. The standard 2026 Part B premium is approximately $185 per month, deducted from your Social Security. Higher-income enrollees pay more (IRMAA).

Part C: Medicare Advantage

Plans from private insurers approved by Medicare that combine Parts A and B, usually include Part D, and often add benefits like vision, dental, hearing, and gym memberships. Many California plans have $0 additional premiums. You generally must use in-network providers.

Part D: Prescription Drug Coverage

Not automatic. If you choose Original Medicare, you add a separate Part D plan. If you skip Part D when first eligible and don't have other equivalent coverage, you'll pay a permanent late penalty.

Your two big options at 65

Option 1: Original Medicare + Medigap + Part D

Original Medicare covers 80% of approved costs; you pay the other 20% with no out-of-pocket maximum. Most people add a Medigap plan to cover that 20%, plus a Part D plan for medications.

California has unusually strong Medigap protections: during your guaranteed enrollment period (the first 6 months after starting Part B), insurers cannot deny you a Medigap plan or charge more for preexisting conditions. California also has an annual birthday rule that lets you switch to a Medigap plan with equal or lesser benefits within 60 days of your birthday each year, regardless of health.

Option 2: Medicare Advantage (Part C)

A private plan that replaces Original Medicare with the same basic coverage, plus a maximum annual out-of-pocket limit and often extras (dental, vision, hearing, gym, transportation). Many Medicare Advantage plans in California have $0 additional premiums. You typically use a network of providers.

California assistance programs for low-income seniors

If your income is limited, California offers several programs that may pay your Part B premium, your Part D, or even your copays:

• QMB (Qualified Medicare Beneficiary): pays your Part A and B premiums, deductibles, and copays.
• SLMB (Specified Low-Income Medicare Beneficiary): pays your Part B premium.
• Extra Help (Part D Low-Income Subsidy): reduces or eliminates your prescription drug premium and copays.
• Medi-Cal + Medicare (dual eligibility): if you qualify for both, you can enroll in a D-SNP plan that coordinates both and eliminates most out-of-pocket costs.

To find out if you qualify, call California's Health Insurance Counseling and Advocacy Program (HICAP) at 1-800-434-0222 or talk to a licensed local agent.

What if I'm still working at 65?

• Employer with 20 or more employees: you can delay Part B without penalty. You'll have an 8-month Special Enrollment Period (SEP) when you stop working or lose coverage.
• Employer with fewer than 20: Medicare becomes your primary insurance at 65. You must enroll during your IEP.

In both cases, you can enroll in premium-free Part A at 65 without affecting your employer coverage.

Late enrollment penalties

• Part B: premium increases 10% for every 12 months of delay. Permanent.
• Part D: 1% additional on the base premium for every month without coverage. Also permanent.

Wait two years without qualifying coverage and you'll pay 20% more on Part B every month for the rest of your life.

Step by step: how to enroll in Medicare in California

1. 4 to 6 months before turning 65: gather your documents (Social Security number, birth certificate, proof of citizenship or legal residency, current insurance info).
2. 3 months before turning 65: enroll in Parts A and B through Social Security at ssa.gov, by phone at 1-800-772-1213, or in person.
3. Choose your path: Original Medicare + Medigap + Part D, or Medicare Advantage.
4. Compare plans: verify your doctors and prescriptions are covered in any plan you consider.
5. Enroll in your plan: directly with the insurer, on Medicare.gov, or with a licensed local agent.
6. Confirm coverage: save your Medicare card and your plan card. Verify the start date is correct.

Common mistakes

• Assuming enrollment is automatic (it isn't, for most people).
• Waiting because the consequences feel distant. Late enrollment penalties are permanent.
• Assuming employer coverage always lets you delay Part B (depends on employer size).
• Choosing a plan without verifying your current doctors are in network.
• Not reviewing your plan each year during AEP (Oct 15 to Dec 7); costs and networks change.

Enrollment checklist

• Determine your exact IEP dates (3 months before to 3 months after turning 65)
• Confirm whether you qualify for premium-free Part A (40 quarters of work)
• Decide if you need Part B now or can delay (large employer)
• Choose between Original Medicare and Medicare Advantage
• If Original Medicare, evaluate Medigap and Part D
• Compare plans available in your zip code
• Verify your doctors and medications are covered
• Ask if you qualify for QMB, SLMB, Extra Help, or D-SNP
• Complete enrollment before your IEP ends