Who Is Astiva Health? A San Diego Medicare Advantage Carrier You May Not Recognize

If you've been comparing Medicare Advantage plans in San Diego County this fall, you may have come across a name you don't recognize: Astiva Health. It's a fair reaction — Astiva isn't a household name the way some national carriers are. But an unfamiliar name isn't a red flag, and it's worth knowing who they are before you rule anything in or out.

Here's a plain-language rundown.

So who is Astiva Health?

Astiva Health is a Medicare Advantage organization based in Southern California, headquartered in the Costa Mesa/Orange area and founded by Dr. Tri Nguyen. It's a newer, fast-growing carrier that offers Medicare Advantage plans (the kind that combine your Part A, Part B, and usually Part D prescription coverage into one plan) rather than a national insurer that also happens to sell Medicare products.

Because it's a regional company built specifically around Southern California's communities, a lot of people simply haven't heard the name yet — even people who've been on Medicare for years.

Is Astiva a legitimate Medicare plan?

Yes. Astiva contracts directly with the Centers for Medicare & Medicaid Services (CMS), the same federal agency that oversees every Medicare Advantage plan in the country. The clearest way to judge a carrier you don't recognize is its CMS Star Rating — a 1-to-5 score CMS assigns based on more than 40 measures like customer service, member experience, and care quality.

Astiva has earned a 4-star rating from CMS, and it's held at that level year over year. For a younger, regional carrier, that's a meaningful signal: it means the plan is being measured by the same yardstick as the big national names and holding its own.

(Star ratings are assigned per plan and per year, so confirm the exact rating on the specific Astiva plan you're considering before you enroll.)

Where does Astiva offer plans?

Astiva's service area covers much of Southern California, including San Diego, Orange, Los Angeles, Riverside, and San Bernardino counties. That regional focus is intentional — the company builds its provider network and services around the communities it actually serves.

What makes Astiva different?

A few things stand out about Astiva's approach:

• A community-based, culturally responsive model. Astiva is built around serving Southern California's diverse senior population, with multilingual customer service and materials.
• A local network model. Rather than a single vertically integrated system, Astiva coordinates care through independent medical groups across the region.
• A member-first focus. As a smaller regional carrier, it competes on service and responsiveness rather than sheer size.

None of this tells you whether an Astiva plan is the right plan for you — that depends entirely on your doctors, your prescriptions, and your budget. But it should put the unfamiliar name in context: Astiva is a legitimate, well-rated, San Diego–area Medicare Advantage carrier, not an unknown quantity to be nervous about.

How do I find out if an Astiva plan fits me?

The only way to know if any plan — Astiva or otherwise — is a good fit is to check it against your own situation: whether your doctors are in-network, whether your medications are covered, and how the costs compare to what you have now.

That's the part I do with clients one-on-one, at no cost to you. I'm a licensed, independent Medicare broker here in San Diego County, and I can walk you through your options side by side so you can decide for yourself.

Call or text me at (619) 947-2325, or visit medicarewithashley.com to set up a time.

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Frequently asked questions

Is Astiva Health a real Medicare plan?

Yes. Astiva Health is a Medicare Advantage organization that contracts with CMS and holds a 4-star CMS Star Rating. It has been serving Southern California seniors for several years.

Where is Astiva Health available?

Astiva offers Medicare Advantage plans across several Southern California counties, including San Diego, Orange, Los Angeles, Riverside, and San Bernardino.

Why haven't I heard of Astiva Health before?

Astiva is a newer, regional carrier focused on Southern California rather than a national insurer, so its name is less familiar even to longtime Medicare members.

How do I compare Astiva to my current plan?

Sit down with a licensed Medicare broker who can compare your doctors, prescriptions, and costs across plans. You can reach me at (619) 947-2325.

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We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov or 1–800–MEDICARE to get information on all of your options.