Medicare Advantage, also known as Part C, is the most common way Southern California residents receive their Medicare coverage today. Before comparing specific plans or reading about HMO versus PPO, it is worth understanding in plain terms what Medicare Advantage is, how it differs from Original Medicare, what plan types exist, and what you can expect to pay. This guide is the starting point before diving into more specific comparisons.
What Medicare Advantage is
Medicare Advantage is a Medicare benefit offered by private insurance companies approved by the Centers for Medicare & Medicaid Services (CMS). Instead of receiving your Part A (hospital) and Part B (medical) coverage directly from the federal government, you receive it through that private company, which must cover, at a minimum, everything Original Medicare covers.
To enroll in a Medicare Advantage plan, you must first have Part A and Part B, and continue paying your Part B premium (unless you qualify for help that covers it). The plan you choose replaces Medicare as the day-to-day administrator of your benefits, although you officially remain a Medicare beneficiary.
Types of Medicare Advantage plans
Not all Medicare Advantage plans work the same way. The most common ones in Southern California are:
- HMO (Health Maintenance Organization): generally requires you to choose a primary doctor and get referrals to see specialists, with lower premiums in exchange for a more limited network.
- PPO (Preferred Provider Organization): lets you see specialists without a referral and offers some out-of-network coverage, usually at a higher cost than seeing an in-network provider.
- SNP (Special Needs Plan): designed for people with certain chronic conditions, dual Medicare and Medi-Cal eligibility, or those living in an institution, with benefits tailored to those needs.
- PFFS (Private Fee-for-Service): less common today, determines how much it pays and how much you owe, and not every provider is required to accept it.
If you already know you want to compare HMO versus PPO specifically in detail, review our HMO vs. PPO guide.
What it covers, including extra benefits
Every Medicare Advantage plan must cover, at a minimum, the same things Original Medicare covers (Part A and Part B), with the exception of hospice care, which Original Medicare continues to cover directly even if you have an Advantage plan. Most plans available in Southern California also include prescription drug coverage (Part D) built into the same plan.
Many plans go beyond the required minimum and add extra benefits Original Medicare does not offer, such as dental care, vision exams and glasses, hearing aids, an over-the-counter (OTC) product allowance, gym memberships, transportation to medical appointments, and, in some cases, meal support after a hospital stay. These benefits vary widely from plan to plan and county to county, so review the specific list for the plan you are considering, not a generic list.
Availability, cost, benefits, and eligibility vary by person, product, contract, and insurance company, as well as by your service area. Guarantees are subject to the claims-paying ability of the issuing insurance company. Karla Arámburo is not affiliated with or endorsed by Medicare or the federal government.
Typical costs you should understand
The cost of a Medicare Advantage plan usually has several parts: the plan's monthly premium (which can be as low as zero dollars in many parts of Southern California), the annual deductible (if the plan has one), copays for doctor or specialist visits, and coinsurance for certain services such as hospital stays.
One important feature Original Medicare lacks is the annual out-of-pocket maximum. Once you reach that limit within a calendar year, the plan pays 100% of covered Part A and B services for the rest of the year. That maximum varies by plan and does not include every type of expense (for example, monthly premiums generally do not count toward it), so it is worth confirming before you enroll, not assuming it from the plan's name.
Who qualifies and when you can enroll
You qualify for a Medicare Advantage plan if you have Medicare Part A and Part B and live within the plan's service area. Most people first enroll during their Initial Enrollment Period, the seven-month window around their 65th birthday, though you can also switch plans every year during the Annual Enrollment Period (October 15 through December 7) or, if you already have Advantage, make one additional change during the Open Enrollment Period (January 1 through March 31). For the full enrollment calendar, review our 2026 Medicare enrollment dates guide.
If you are not sure whether Medicare Advantage or Original Medicare paired with Medigap fits your situation better, that full comparison is in our Medicare Advantage vs. Medigap.
Free bilingual help in Southern California
I am Karla Arámburo, an independent, bilingual, licensed insurance agent serving families in Orange, Los Angeles, San Diego, and Riverside counties. As an independent agent, I compare the specific Medicare Advantage plans available for your ZIP code — from multiple insurers, not just one — and honestly explain their networks, costs, and extra benefits in Spanish or English, at no cost to you.
You can call or text (619) 321-8733 to schedule a free consultation. This page is general education, not individualized advice or an enrollment recommendation.
Frequently asked questions
Does Medicare Advantage replace Original Medicare?
Not exactly. You still have Medicare, but instead of receiving your Part A and Part B benefits directly from the government, you receive them through a private, Medicare-approved company that administers your plan.
Do Medicare Advantage plans cost the same throughout Southern California?
No. Premiums, provider networks, extra benefits, and drug formularies vary by county and even by ZIP code, so two people in different cities may see very different options available to them.
Can I change Medicare Advantage plans every year?
Yes. During the Annual Enrollment Period, October 15 through December 7, you can switch from one Advantage plan to another, return to Original Medicare, or change your Part D coverage for the following year.
What happens if I travel outside my plan's service area?
Most Medicare Advantage plans cover emergencies anywhere in the United States, but routine care outside the network or service area may not be covered, or may cost significantly more. If you travel frequently, this deserves special attention when comparing plans.
Do all Medicare Advantage plans include prescription drugs?
Not all of them. Many plans (called MA-PD) do include integrated drug coverage, but some — especially certain PPOs or private fee-for-service plans — do not, and you would need to verify this before enrolling.
Can I have Medicare Advantage and Medicaid (Medi-Cal) at the same time?
Yes, and in that case you may qualify for a special plan called a D-SNP, designed for people with dual eligibility, which often includes additional benefits and coordination between both programs.
How much does it cost to talk with you about my options?
Nothing. My consultation, plan comparison, and enrollment help are free to you, because licensed agents are paid by the insurance companies, not by you.