Medicare help · The San Francisco Bay Area
John Muir Health, Kaiser Walnut Creek and Antioch, Sutter Delta and Rossmoor’s thousands of Medicare households — Contra Costa is a two-system county and shops that way.
No cost, no obligation, no pressure.
No cost, no pressure. Prefer to call? (702) 706-6564.
Medicare in Walnut Creek & Contra Costa
Contra Costa County offers Kaiser Senior Advantage, a moderate non-Kaiser menu built mainly on John Muir Health and its medical group, plus Sutter Delta in the east county, every Medigap carrier in California and the full Part D lineup. Rossmoor in Walnut Creek is one of the largest retirement communities in Northern California and every carrier knows it.
We compare what is sold at your ZIP code, confirm your doctors and medical group, and set Advantage beside a Medigap policy so the trade-off is plain.
Major care in the area includes:
Plan networks differ — we check that your doctors and hospital are covered before you enroll.
Rossmoor, Lafayette, Orinda, Moraga, Danville, San Ramon, Alamo, Concord, Pleasant Hill, Martinez, Brentwood, Antioch.
Turning 65? Your Initial Enrollment Period is the 7 months around your birthday. Already on Medicare? The Annual Election Period is Oct 15–Dec 7, Medicare Advantage Open Enrollment runs Jan 1–Mar 31, and California’s Medigap birthday rule gives you 60 days from your birthday each year to switch supplements without health questions.
Your options
All-in-one Part C plans, often $0 premium, built on a county network — the choice of about half of California, and the one that changed most for 2026.
How Advantage worksMedigap pairs with Original Medicare and works with any provider nationwide — UCLA, Stanford, Cedars, City of Hope, or your doctor in Arizona — with California’s birthday rule to switch every year.
How Medigap worksStandalone drug coverage chosen around your medications and pharmacy. 2026 out-of-pocket cap: $2,100.
How Part D worksSenior Advantage is its own world: everything in one system, and no Medigap route in. When it fits, and when it doesn’t.
Kaiser & MedicareQuestions from Walnut Creek & Contra Costa
Contra Costa County typically offers a moderate Medicare Advantage menu, every Medigap carrier in California, and the full Part D lineup. Availability is set by county and changes each plan year.
Each system contracts with some Medicare Advantage plans and not others, and the lists change every October. With Original Medicare and a Medigap policy there is no network to check, except Kaiser, which is reached only through Kaiser Senior Advantage. We confirm your doctors before you enroll.
Kaiser Permanente is a closed system: you keep Kaiser doctors on Medicare through Kaiser Senior Advantage, not through Original Medicare and a Medigap policy. If you are leaving Kaiser, or joining it, that is the first decision, and we walk through it plainly.
Nearby
Ready when you are
A short, friendly conversation — no pressure, no cost.
Written and reviewed by Darin Weidauer — licensed insurance agent (NPN 18580338, CA License #0M00978), Gerontologist (USC Leonard Davis School of Gerontology), MBA, Registered Social Security Analyst, and 22-year U.S. Air Force veteran.Last reviewed September 4, 2026. Plan availability, benefits and costs change every plan year — verify current details at Medicare.gov, 1-800-MEDICARE, or California HICAP at 1-800-434-0222.