Dennis Jarvis, serving California since 1999. No cost, no pressure.
How Medicare Works in California (2026)
- Medicare has four parts: Part A (hospital), Part B (medical), Part C (Medicare Advantage), and Part D (prescription drugs).
- You choose one of two paths: Original Medicare + a Medigap supplement + Part D, or Medicare Advantage (Part C) which bundles everything.
- In California, the Medigap Birthday Rule lets you switch supplement plans each year without medical underwriting, a protection most states don't have.
- Your Initial Enrollment Period is the 7 months around your 65th birthday. Missing it can mean lifelong penalties.
- Help from a licensed California Medicare agent is free. You pay the same either way.
Medicare Part A, B, C, and D Explained SIMPLY - Watch on YouTube
Medicare is federal health insurance for people 65 and older (and some younger people with disabilities). It isn't one single plan. It's a set of parts and choices, and how you put them together determines your coverage, costs, and doctor access. This guide walks through the whole picture, with each section linking to a deeper page.
What Are the Parts of Medicare?
Medicare is built from four parts. Understanding them is the foundation:
Hospital Insurance
Covers inpatient hospital stays, skilled nursing, hospice, and some home health. Most people get Part A premium-free.
Medical Insurance
Covers doctor visits, outpatient care, preventive services, and durable medical equipment. Has a monthly premium.
Medicare Advantage
A private all-in-one alternative that bundles A, B, and usually D, often with extras like dental and vision. Uses networks.
Prescription Drugs
Covers prescription medications. Offered through private plans, either standalone or built into a Medicare Advantage plan.
Want the full breakdown? See Medicare Parts A, B, C, and D explained.
The Big Decision: Advantage or Medigap?
This is the choice that affects everything else. You pick one of two paths:
| Path | What you get | Best for |
|---|---|---|
| Original Medicare + Medigap + Part D | Original Medicare, plus a Medigap supplement that covers most out-of-pocket costs, plus a standalone Part D drug plan. | Freedom to see any doctor that accepts Medicare nationwide; predictable costs; higher monthly premium. |
| Medicare Advantage (Part C) | A single Medicare Advantage plan that bundles A, B, and usually D, often with extra benefits. | Lower or $0 premium; extra benefits; willing to use a network of doctors. |
This is the single most important Medicare decision. We break it down fully on our Medicare Advantage vs Medigap page.
California gives you a rare advantage: the Birthday Rule
California is one of the few states with a Medigap "Birthday Rule." Each year around your birthday, you get a window to switch to an equal or lesser Medigap plan without medical underwriting, meaning you can't be turned down or charged more for health reasons. In most states, once you're past your initial enrollment, switching Medigap plans requires passing underwriting. California protects you here.
This is a real advantage for Californians, and timing it right can save you money. See our full California Medigap Birthday Rule guide.
Not sure you've got Medicare right?
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When Can You Enroll in Medicare?
Timing matters, and missing your window can mean lifelong penalties. Your Initial Enrollment Period is a 7-month window around your 65th birthday (3 months before, your birthday month, and 3 months after). There are also annual enrollment periods to make changes. Full details on our Medicare Enrollment Periods page.
What Does Medicare Cost?
Costs include the Part B premium, possible Part D premiums, and out-of-pocket amounts that vary by your path. Some Medicare Advantage plans even offer a Part B "giveback" that reduces your premium. See our Medicare costs guide for the details.
Explore Each Medicare Topic
This hub connects to a full guide on every part of California Medicare. Use the guide above or the links throughout to go deeper. Or skip the research and let a certified California Medicare agent walk you through it, free.