Medicare Advantage in San Diego: Why a $0 Premium Can Cost You Scripps & UCSD

Updated July 21, 2026

The pitch is real — that part isn't the trap

Pull up the Medicare Plan Finder for a San Diego ZIP code and the appeal takes about ten seconds to grasp. San Diego County residents can choose from 60 Medicare Advantage plans for 2026, and 51 of them cost nothing beyond the standard Part B premium. Nearly every plan bundles drug coverage plus the extras Original Medicare has never offered — nationally, 98% of individual Advantage plans include some dental benefit, over 99% vision, and 95% hearing, per KFF's 2026 analysis. Advantage plans also cap your annual in-network out-of-pocket costs — $5,421 on average in 2026 — which Original Medicare alone does not.

The pitch works. As of 2026, 55% of eligible Medicare beneficiaries nationwide — 35.2 million people — are in an Advantage plan. San Diego's single biggest plan, Kaiser Permanente Senior Advantage, counts about 67,600 members as of May 2026, per Medicare.org's county enrollment data.

So no, $0-premium is not a gimmick. Medicare pays the insurer whether you pay a premium or not, and the benefits are real. The problem in San Diego is what the $0 quietly buys you out of.

The San Diego catch: Scripps is out, and UCSD mostly is

Scripps left Medicare Advantage in January 2024. Scripps Clinic and Scripps Coastal — the two big medical groups behind the Scripps hospitals — stopped accepting Advantage plans effective January 1, 2024, a change NBC 7 San Diego reported affected more than 32,000 local seniors. CEO Chris Van Gorder was blunt about why, telling KPBS: "we're losing more than $75 million a year, and that's just not sustainable." Two and a half years on, nothing has reversed. As of July 2026, Scripps' own accepted-insurance page lists Medicare Parts A and B and Medicare supplement (Medigap) plans — and no Advantage plans at all.

One caution here. Plans sold in San Diego can still carry Scripps-flavored names left over from older arrangements — plan directories for 2026 list a SCAN HMO called "Scripps Classic," for example. A plan name is marketing; a network is a contract, and the two can drift apart. Before you rely on any plan to reach a Scripps doctor, confirm it twice — once with the plan, once with the Scripps office you actually want to visit.

UC San Diego Health pulled back in January 2026. Effective January 1, 2026, UCSD ended its Humana Medicare Advantage contract for both primary and specialty care, and the two Advantage PPOs that had included it — UnitedHealthcare's AARP Medicare Advantage PPO and Blue Shield's Medicare Advantage PPO — stopped being offered in San Diego County entirely, per UCSD Health's accepted-plans page. That page now states flatly that no Medicare Advantage PPO plan offered in the county is in-network with UC San Diego Health. What remains is a short exceptions list: a SCAN HMO option tied to specific affiliated medical groups, a kidney-care special-needs plan, University of California retiree plans, and a few narrow contracts, some specialty-only. Original Medicare and every Medigap plan, by contrast, stay fully accepted.

Now add up what those two decisions mean. Scripps runs the La Jolla, Green, Mercy, and Encinitas hospitals; UCSD runs Jacobs Medical Center and Moores Cancer Center, the region's academic medicine. If your picture of getting older in San Diego includes either — your longtime cardiologist at Scripps Clinic, or Moores as the place you'd want a cancer diagnosis handled — most of the county's 60 Advantage plans cannot take you there for routine and ongoing care. Emergencies are the exception: Advantage plans must cover emergency care at any hospital. It's everything after the emergency that follows the network.

Hospital systems nationwide have been dropping Advantage contracts over payment and prior-authorization disputes, so the direction isn't unique to us. What's unusual is that both of the county's flagship systems — Scripps and UC San Diego Health — stepped back this decisively. That's why the $0 decision is sharper in San Diego than in most of the country.

Prior authorization and referrals: how Advantage runs day to day

Even inside a network that keeps your doctors — Sharp's medical groups, say — Advantage runs differently than Original Medicare. Ninety-nine percent of Advantage enrollees are in plans that require prior authorization for some services, typically the expensive ones: imaging, skilled-nursing stays after a hospital discharge, Part B drugs. In 2024, Advantage insurers received nearly 53 million prior-authorization requests and denied about 4.1 million, close to 8%. Some denials get overturned on appeal. Most are never appealed.

Original Medicare requires prior authorization for very few services. And most Advantage plans sold in San Diego are HMO or HMO-POS designs, where a primary-care doctor inside the plan's medical group coordinates referrals to specialists in that same network.

None of this makes the coverage bad. It makes it managed: after a hospital discharge, the imaging approvals, the rehab-stay authorization, and the specialist referrals all run through the plan's process, and the enrollee is the one steering it.

Switching back: the exit isn't guaranteed

You can always return to Original Medicare during an enrollment window. What you can't always do is get a Medigap policy to go with it — and without one, Original Medicare has no cap at all on your 20% share of costs. Federal rules give you two main "trial right" escape hatches, both 12 months long: if you joined an Advantage plan when you first became eligible at 65, you can switch to Medigap with guaranteed acceptance during your first year; and if you dropped a Medigap policy to try Advantage for the first time, you have 12 months to go back to it. California Health Advocates keeps a plain-English list of these guaranteed-issue situations.

Outside those windows, California Medigap insurers can medically underwrite you — review your health history, then decline you or charge more because of it. The overlap matters in this county: the same health history that makes Scripps or UCSD access valuable is what an underwriter is allowed to price, or decline.

The calendar matters too. Leaving an Advantage plan happens in defined windows — the fall Annual Enrollment Period (October 15 to December 7, for the following January) and the Medicare Advantage Open Enrollment Period (January 1 to March 31, when current Advantage members can switch plans once or drop back to Original Medicare). That's when the 32,000 Scripps patients had to decide in late 2023, and when UCSD's Humana and PPO members had to decide two years later. But notice what those windows guarantee: a change of plan, not a Medigap approval. The window gets you out of Advantage; only a trial right or a cooperative underwriter gets you into a supplement.

California's much-cited "birthday rule" doesn't rescue you either. It gives you 60 days from the first day of your birth month to switch Medigap plans without underwriting, but only if you already have a Medigap plan. It does nothing for someone trying to get from Advantage into Medigap.

And look at what actually happened to UCSD's Advantage patients in January 2026: their hospital left the network, letters went out, and the remedy was to pick a different Advantage plan or return to Original Medicare during an enrollment window. Under federal rules, a provider leaving your network does not by itself create a guaranteed-issue right to Medigap. Patients who wanted UCSD kept open and were past their trial year had no promised path to a supplement. The structural risk, plainly: the network can change around you, and the exit can be underwritten.

Who Advantage still fits in San Diego

An honest accounting cuts both ways. Advantage is the right answer for a lot of San Diegans:

• Kaiser members. Kaiser Permanente Senior Advantage is how Kaiser does Medicare, and at roughly 67,600 members it's the county's largest plan. If you've been Kaiser for years and like it, this is the natural continuation — Scripps and UCSD were never part of your care map, and Kaiser's integrated model blunts most referral friction.
• Committed Sharp patients. Sharp HealthCare went the opposite direction from Scripps: as of July 2026 it accepts its own Sharp Direct Advantage HMO plans plus a roster of UnitedHealthcare Advantage plans, alongside Original Medicare and all Medigap plans. If your doctors already sit inside Sharp's medical groups and a $0 premium matters, that combination is coherent.
• Tight monthly budgets. Medigap is a real premium every month, on top of Part B and a drug plan, and it generally climbs with age. If that line item genuinely doesn't fit, a $0-premium plan with a hard out-of-pocket cap can be the responsible choice, made knowingly, with the network trade understood.
• People with retiree or Medi-Cal coverage. Employer-group Advantage plans and dual-eligible special-needs plans carry their own networks and rules (UC's own retiree plans, notably, still include UCSD); judge those on their terms.

Who it doesn't fit, in this county: anyone whose plan for aging includes Scripps or UC San Diego Health by name.

The bottom line

In most of the country, Advantage versus Original Medicare is a genuine toss-up. In San Diego, as of mid-2026, it has an unusually clean fault line. If keeping Scripps and UCSD open matters to you, Original Medicare plus a Medigap supplement and a Part D drug plan is the configuration that does it — chosen early, while acceptance is guaranteed, not later, when underwriting gets a vote. If your care lives happily inside Kaiser or Sharp, a $0-premium plan is a fair deal entered with open eyes. Circle your 12-month trial deadline either way.

For the full picture — enrollment windows, Medigap plan letters, drug coverage, and how the county's four systems line up — start with our San Diego Medicare guide. And before you enroll in anything, check your exact doctors against the plan's current directory. San Diego's networks have changed twice in three years. Assume they can change again.