QUICK ANSWER: Which San Diego health system you can use depends on how you get your Medicare. With Original Medicare plus a Medigap policy, you can see any provider that accepts Medicare, with no network to check. With a Medicare Advantage plan, access depends on the plan’s network for that year and, with most HMO plans in California, on the medical group your primary doctor belongs to. Check your doctor, their medical group, and your hospital in the plan’s current directory before you enroll or switch.

If you live in San Diego County, your Medicare decision usually comes down to a question no national website answers well: can I keep seeing my doctors at Sharp, Scripps, UC San Diego Health, Kaiser Permanente, or Palomar Health?

Plan brochures lead with premiums and extra benefits. But for most San Diegans, the health system you use — and whether a plan’s network includes your doctors and medical group — matters more than any single dollar figure. This guide explains how San Diego’s major health systems fit into Medicare, and exactly how to check before you enroll or make a change.

The five health systems most San Diego beneficiaries use

Which of these you can use depends on how you receive your Medicare coverage.

Medicare Advantage in San Diego: networks and medical groups

Medicare Advantage (Part C) plans are offered by private insurers and typically use a network of local providers. In California, there’s an extra layer many people miss: with most HMO plans, you don’t just pick a plan — you (or the plan) also assign you to a medical group or IPA, and that medical group determines which specialists and hospitals you can use.

Two people in the same plan can have different access depending on their medical group. So when you check a plan, check three things:

  1. Is my doctor in the plan’s directory?
  2. Which medical group is my doctor listed under in that plan?
  3. Does that medical group admit to the hospital I want (Sharp, Scripps, UCSD, Palomar)?

One local example of how closely plans and systems can be tied: Sharp Direct Advantage is a Medicare Advantage HMO offered by Sharp Health Plan — Sharp HealthCare’s own insurance affiliate — and serves San Diego County. It is one of a number of Medicare Advantage options in the county; whether it, or any plan, fits you depends on your doctors, prescriptions, and budget. (This is a factual example, not a recommendation.)

Kaiser Permanente works differently again: its Medicare Advantage plans are built around Kaiser’s own doctors and facilities, so it generally suits people who want to receive their care within the Kaiser system.

Networks are not permanent. San Diego has seen plan and network lineups change from year to year, which is why the plan’s Annual Notice of Change (ANOC) , which plans send by the end of September, deserves a careful read. Our guide to reading your Annual Notice of Change walks through what to look for, and if your plan is ending, see what to do when a Medicare Advantage plan is discontinued.

What has changed recently in San Diego

One local example shows why it pays to check every year:

UC San Diego Health. UC San Diego Health publishes a list of the Medicare plans it accepts. It lists Original Medicare and Medicare Supplement plans and notes a primary-care change for one Medicare Advantage HMO that took effect March 1, 2026. It also encourages patients to call their insurance company to verify that its doctors and hospitals are in network.

This example is not a reason to choose one kind of coverage over another. It is a reason to check your own doctors against the current year’s lists before you enroll or switch.

Original Medicare + Medigap: system choice without networks

If provider flexibility is your priority, the other route is Original Medicare with a Medicare Supplement (Medigap) policy. Medigap works alongside Parts A and B and lets you see any provider in the country that accepts Medicare — which includes the large San Diego systems for Medicare-participating services. (Kaiser Permanente is the exception: it generally provides care to members of its own plans.) There is no network to check and no medical-group assignment.

The trade-offs: Medigap has its own monthly premium, and it doesn’t include drug coverage, so most people pair it with a standalone Part D plan. California also gives Medigap policyholders the Birthday Rule — a window of at least 60 days each year, beginning on your birthday, to switch to another Medigap plan of equal or lesser benefits without medical underwriting.

For a fuller comparison of the two routes, see our San Diego Medicare guide and the deeper dive on Medicare Advantage plans in San Diego County.

How to check your doctors before you enroll or switch

  1. Make your list: every doctor you see, the hospital you’d choose, and your prescriptions with dosages.
  2. Use the plan’s current-year provider directory (online directories update more often than printed ones) and search each doctor by name. Medicare’s own Plan Finder lets you compare the plans offered in your ZIP code side by side.
  3. Note the medical group shown next to your primary doctor — then confirm your specialists are reachable through that same medical group.
  4. Call the doctor’s office and ask directly: “Which Medicare Advantage plans and medical groups are you accepting for next year?” Offices know their own contracts before directories catch up.
  5. Re-check every fall. Between October 15 and December 7 — the Annual Enrollment Period (AEP) — you can join, switch, or drop a Medicare Advantage or Part D plan for the following year.

If you’d rather not do this alone, this is exactly what an independent Medicare broker in San Diego County does: check your doctors, medical groups, and prescriptions against the plans I represent in your ZIP code, at no cost to you, because brokers are paid by the insurance carriers.

More local guides: how health systems work with Medicare in Los Angeles, Orange County, and San Diego.

Frequently asked questions

Does Sharp have its own Medicare Advantage plan?
Yes. Sharp Health Plan, Sharp HealthCare’s insurance affiliate, offers Sharp Direct Advantage, a Medicare Advantage HMO serving San Diego County. Other Medicare Advantage plans in the county may also include Sharp providers in their networks, so check each plan’s current directory.
Can I keep my Scripps or UC San Diego Health doctor on Medicare Advantage?
It depends on the specific plan and medical group for the specific year. Network participation varies by plan and can change annually, so verify your doctor and their medical group in the plan’s current directory, or ask the office directly which plans they accept.
What Medicare Advantage plans does UC San Diego Health accept?
UC San Diego Health lists the Medicare plans it accepts on its website. The list includes Original Medicare and Medicare Supplement plans. For Medicare Advantage, check that list, then call your plan to verify that your doctors and the hospital are in network for the coming year.
Do all San Diego hospitals accept Original Medicare?
The large San Diego systems participate in Original Medicare for covered, Medicare-participating services. With Original Medicare plus a Medigap policy, you can generally use any provider that accepts Medicare, without network restrictions. Kaiser Permanente is the exception: it generally provides care to members of its own plans.
What happens if my plan’s network drops my doctor or medical group?
Plans must notify you of significant changes. Your regular chance to change plans is the Annual Enrollment Period (October 15 – December 7); in some situations, such as certain significant network changes or a plan ending, Medicare may grant a Special Enrollment Period. Check with Medicare.gov or 1-800-MEDICARE about your specific situation.
Is it more expensive to get help from a broker when comparing San Diego plans?
No. Working with a licensed independent broker costs you nothing and does not change your premium, because brokers are paid by the insurance carriers. You always remain free to compare every plan yourself at Medicare.gov.

Sources & official references

Last reviewed: October 2026. Educational information only, not individualized advice. Health-system and plan names are used for identification only and do not imply affiliation or endorsement. Plan networks and benefits change annually; confirm current details with the plan and at Medicare.gov. 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. Currently we represent 12 organizations which offer 442 products in your area. Please contact Medicare.gov or 1-800-MEDICARE 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.