Medicare Advantage Plans in Ventura County: How to Compare

If you live in Ventura, Oxnard, Camarillo, Thousand Oaks, Simi Valley, Ojai, Santa Paula, Fillmore, Moorpark, or Port Hueneme, the Medicare Advantage plans available to you are set at the county level. This guide explains how these plans work and what to check before you enroll — written by a local independent licensed broker, in plain English.

What a Medicare Advantage plan is

Medicare Advantage, also called Part C, is one of the two main ways to receive your Medicare benefits. Instead of using Original Medicare directly, you enroll in a plan offered by a private insurance company approved by Medicare. The plan then bundles your Part A (hospital) and Part B (medical) coverage into one package, and most plans in Ventura County include Part D prescription drug coverage in that same package.

Many plans also add supplemental benefits that Original Medicare does not include — some dental, vision, or hearing coverage, for example. Those benefits vary widely in what they actually cover, so the details matter more than the headline.

Plans differ mainly in three ways: which doctors and hospitals are in the network, how each plan’s drug formulary treats your prescriptions, and what you pay out of pocket. All three can change every year, which is why the plan that fit you last year deserves a fresh look each fall.

One important note about “$0 premium” plans: a zero plan premium is not free coverage. You still pay your monthly Part B premium, plus the plan’s copays and coinsurance when you use care. Current premium and deductible amounts are listed at Medicare.gov, and our guide to what Medicare costs explains each category.

Networks: the biggest practical difference

Ventura County care is concentrated in a handful of hospital systems and medical groups — including Community Memorial Healthcare in Ventura and Ojai, Dignity Health’s St. John’s hospitals in Oxnard and Camarillo, Los Robles Health System in Thousand Oaks, the county-run Ventura County Medical Center, and Kaiser Permanente, which serves much of the county through its own integrated model. Independent medical groups and clinics fill out the picture.

Each Medicare Advantage plan contracts with only some of these providers. No plan includes every doctor in the county, and networks are set year by year — so if keeping your doctor matters to you, verify that they are in the network for the plan year you are enrolling into, not just the current one. Check the plan’s provider directory and confirm with the doctor’s office directly; directories can lag.

HMO vs. PPO

Most Medicare Advantage plans in Ventura County are HMOs: you choose a primary care physician, referrals are generally required for specialists, and care outside the network is not covered except in emergencies. HMOs tend to have lower out-of-pocket costs in exchange for those rules.

PPO plans allow you to see out-of-network providers at higher cost-sharing. Neither type is better in the abstract — the right answer depends on your doctors, your prescriptions, and how much flexibility you want. Beneficiaries whose providers are spread across several systems often find a PPO worth the extra cost; those whose care centers on one system often do well in an HMO.

Five things to check before choosing a plan

1. Your doctors. Confirm your primary care physician, specialists, and preferred hospital are in-network for the upcoming plan year.
2. Your prescriptions. Every plan’s formulary tiers drugs differently. The same medication can cost different amounts on two plans with identical premiums.
3. Your pharmacy. Plans designate preferred pharmacies where copays are lowest.
4. The out-of-pocket maximum. Every Medicare Advantage plan caps your annual in-network costs. The cap varies by plan; current amounts are at Medicare.gov.
5. The star rating. Medicare rates plans 1 to 5 stars. It is one useful signal, but secondary to whether the plan fits your doctors and drugs.

For the full seven-step version, with a printable worksheet, see my general checklist for comparing Medicare Advantage plans.

When you can enroll or switch

• Initial Enrollment Period: the seven-month window around your 65th birthday — three months before your birthday month, your birthday month, and three months after.
• Annual Enrollment: October 15 – December 7 each year, for coverage starting January 1.
• Medicare Advantage Open Enrollment (MA-OEP): January 1 – March 31. One switch allowed if you are already on a Medicare Advantage plan.
• Special Enrollment Periods: for qualifying events — moving, losing coverage, or a plan leaving your area, among others. If your plan is discontinued, see our guide on what to do when a Medicare Advantage plan is discontinued in California.

Your plan’s Annual Notice of Change (ANOC) arrives in September. It lists what changes January 1 — premiums, copays, the drug list, and the network. It is the single most useful document for deciding whether to shop during Annual Enrollment. Our Annual Enrollment guide for Southern California walks through the October 15 – December 7 window step by step.

Medicare Advantage or Original Medicare with a supplement?

Medicare Advantage is one of two main paths. The other is staying with Original Medicare and adding a Medicare Supplement (Medigap) policy plus a standalone Part D drug plan. The trade-offs — networks, underwriting timing, predictability of costs — are covered in our side-by-side guide: Medigap vs. Medicare Advantage.

Where to get help in Ventura County

• Medicare.gov or 1-800-MEDICARE — lists every plan available in your ZIP code.
• HICAP — free, unbiased counseling from California’s Health Insurance Counseling and Advocacy Program, the State Health Insurance Assistance Program (SHIP) for California. In Ventura County, HICAP is administered through the Ventura County Area Agency on Aging; the statewide HICAP line is 1-800-434-0222.
• An independent licensed broker — help at no cost to you, because brokers are paid by the insurance carriers. A broker can compare plans against your doctors and prescriptions and handle the paperwork. Note that a broker may not offer every plan available in your area.

If you’d like local help, I work with Medicare beneficiaries throughout Ventura County, including Oxnard and Thousand Oaks. Consultations are free and there is no obligation.

Frequently asked questions

How many Medicare Advantage plans are available in Ventura County?

The number changes each year and varies by ZIP code. Medicare.gov shows the current list for your exact ZIP code, and the lineup for the upcoming year is published each fall before Annual Enrollment.

Are Ventura County plans the same as Los Angeles County plans?

No. Medicare Advantage plans are approved county by county. Premiums, networks, and extra benefits for the same insurer can differ between Ventura and Los Angeles counties.

Do all Ventura County Medicare Advantage plans include drug coverage?

Most include Part D drug coverage in the same package, but not all. If you choose a plan without drug coverage, going 63 or more days without creditable drug coverage can trigger a permanent late enrollment penalty.

Can I keep my doctor if I switch plans?

Only if your doctor is in the new plan’s network for the year you are enrolling into. Networks change annually — verify with both the plan directory and your doctor’s office before switching.

What does a Medicare Advantage plan cost in Ventura County?

Plan premiums range widely, and a $0 premium plan still involves the Part B premium, copays, and coinsurance. For current dollar amounts — premiums, deductibles, and out-of-pocket maximums — check Medicare.gov, which always has the current year’s figures.

More county guides: also see how to compare Medicare Advantage plans in San Diego County, Orange County, and Riverside County.

Sources & official references

• Medicare.gov Plan Compare — official plan finder, star ratings, and current dollar amounts
• CMS.gov — Centers for Medicare & Medicaid Services
• California HICAP — free, unbiased Medicare counseling, 1-800-434-0222 (California’s State Health Insurance Assistance Program (SHIP))

This is a non-government resource and is not affiliated with or endorsed by Medicare.gov or the federal Medicare program. We do not offer every plan available in your area. Please contact Medicare.gov, 1-800-MEDICARE, or your local State Health Insurance Assistance Program (SHIP) — in California, the Health Insurance Counseling and Advocacy Program (HICAP) — to get information on all of your options. Matt Medicares Insurance is an independent insurance brokerage and is not affiliated with or endorsed by Medicare, the Centers for Medicare & Medicaid Services, or any government agency. Educational information only, not individualized advice. Last reviewed: August 2026. Medicare figures and plan details change annually — confirm current amounts and plan availability at Medicare.gov.