--- title: "Medicare Advantage plans in Contra Costa County, CA for 2027" description: "5 Medicare Advantage plans from 3 insurers in Contra Costa County, California for 2027: 2 with a $0 premium, out-of-pocket maximums $295 to $6,750. CMS data, local SHIP help and how to compare." url: https://seniortransitionassistance.com/medicare-advantage/counties/ca/contra-costa-county/ updated: 2026-10-16 site: Senior Transition Assistance --- Medicare Advantage ยท 2027 plan year # Medicare Advantage plans in Contra Costa County, California for 2027 2027 plan year Call a licensed agent Free, no obligation, no pressure. Have your doctors and prescriptions nearby. [(800) 614-8388](tel:+18006148388) TTY 711. Mon to Fri, 8 a.m. to 8 p.m. 5 plans from 3 insurers, with CMS numbers for Contra Costa County, California and free local help. Quick answer CMS lists 5 Medicare Advantage plans from 3 insurers that people with Medicare can join in Contra Costa County, California for 2027. 2 have a $0 monthly premium and 4 include drug coverage. In-network out-of-pocket maximums run from $295 to $6,750 a year. 4 of the 5 plans with a 2027 star rating have 4 or more stars. Data last updated September 22, 2026 (CMS landscape 202609.1); star ratings October 8, 2026. **We do not offer every plan available in your area.** Currently we represent a small number of insurance agencies and the plans they carry. Please contact Medicare.gov, 1-800-MEDICARE (TTY 1-877-486-2048), 24 hours a day / 7 days a week, or your local State Health Insurance Assistance Program (SHIP) to get information on all of your options. We are an independent information and referral resource. We are not connected with, endorsed by, or acting on behalf of the United States government, the Centers for Medicare & Medicaid Services, or the federal Medicare program. Calling a number on this page connects you with a licensed insurance agent or a third-party marketing partner. ## 2027 plan numbers for Contra Costa County ### Contra Costa County at a glance Plans open to everyone 5 With a $0 monthly premium 2 With drug coverage 4 In-network out-of-pocket maximum $295 to $6,750 Insurers with plans 3 Plans rated 4+ stars 4 of 5 rated Special needs plans (qualifying members only) 5 Plans open to everyone means Medicare Advantage and Medicare Advantage with drug coverage plans that are not special needs plans. Premium means the plan premium; your Part B premium is separate. Contra Costa County ranks #41 among US counties by population (Census estimate for July 1, 2025: 1,170,070 people). By number of plans offered it ranks #27 of the 55 counties in California that have plans, and #2734 of the 3,040 counties in the country that have plans. ### Plans by type | Plan type | Plans | What it generally means | |---|---|---| | HMO | 4 | Care usually has to come from the plan's network. | | PPO | 1 | Out-of-network care is allowed, usually at a higher cost. | ### Insurers with plans in Contra Costa County | Insurer | Plans in Contra Costa County | Share of plans | |---|---|---| | Imperial Health Plan of California, Inc. | 2 | 40% | | Kaiser Permanente | 2 | 40% | | Humana | 1 | 20% | ## How Contra Costa County compares with the rest of California The state column is the average of the 55 California counties that have Medicare Advantage plans in the CMS file; each county counts once, whatever its population. | Measure | Contra Costa County | Average California county | |---|---|---| | Plans open to everyone | 5 | 12.3 | | Plans with a $0 premium | 40% | 69% | | Insurers with plans | 3 | 4.9 | | PPO and Regional PPO share of plans | 20% | 13% | | Lowest out-of-pocket maximum | $295 | $745 | | Highest out-of-pocket maximum | $6,750 | $7,155 | | Rated plans with 4+ stars | 80% | 57% | | Plans with drug coverage | 80% | 73% | - The 5 plans offered here are 59% below what the average California county has (12.3). - 40% of the plans here (2 of 5) charge no monthly premium; the average California county is at 69%. - 4 of the 5 plans with a star rating (80%) are rated 4 stars or higher, versus 57% in the average California county. - Imperial Health Plan of California, Inc. and Kaiser Permanente are tied for the most plans, 2 each. ## What this means in Contra Costa County With 5 plans from 3 insurers, Contra Costa County has fewer options than the California county average of 12.3, which makes checking every one against your doctors and drugs practical. A bigger share of rated plans clear 4 stars than in the typical California county, though a rating describes the insurer's contract, not your doctors. Fewer insurers means fewer networks to check, so your doctors' participation narrows the list quickly. 2 of 5 plans have a $0 premium and the rest charge one, so weigh premium against the out-of-pocket maximum, which is $295 to $6,750. A $0 premium does not remove copays or coinsurance, and your Part B premium is separate. 80% of the plans are HMO or HMO-POS, which generally keep you in the plan's network; check that your doctors and hospital are in it. The 1 PPO-type plan allows out-of-network care, usually at a higher cost. 4 of the 5 rated plans have 4 or more stars. CMS rates the insurer's contract, so look up the rating of the specific plan you are considering. ## How to compare plans in Contra Costa County - **Doctors and hospitals.** Ask each plan whether your doctors, your hospital and any specialists are in its network today. 4 of 5 plans here are HMO or HMO-POS and 1 are PPO-type, so the rules differ. - **Prescriptions.** 4 of 5 plans include drug coverage. For each drug, check the plan's formulary, the tier it sits on and the pharmacy you would use. - **Out-of-pocket cap.** The in-network maximum runs $295 to $6,750 a year depending on the plan, a gap of $6,455. The cap is what limits a hospital stay or a run of treatments. - **Extras and cost-sharing.** Compare copays for primary care, specialists and the emergency room, and any dental, vision and hearing benefits you would use. - **Star rating.** 4 of the 5 rated plans have 4 or more stars. Ask for the rating of the exact plan, then see how it handles the doctors and drugs above. Plan Finder at Medicare.gov shows every plan available at your address. If your ZIP code is in Contra Costa County, you can also [check plan counts for your ZIP code](https://seniortransitionassistance.com/medicare-advantage-zip/) on this site. ## Dates that matter for 2027 coverage - **Open enrollment runs October 15 to December 7, 2026.** You can join, switch or drop a Medicare Advantage plan in that window. - **Coverage changes take effect January 1, 2027.** Plans send an Annual Notice of Change in the fall listing what is different next year. ## Free local Medicare help in California The State Health Insurance Assistance Program (SHIP) gives free, unbiased Medicare counseling. In California it is run as California Health Insurance Counseling and Advocacy Program (HICAP). ### HICAP in California Program California Health Insurance Counseling and Advocacy Program (HICAP) Phone [1-800-434-0222](tel:18004340222) Website [aging.ca.gov/Programs_and_Services/Medicare_Counseling](https://www.aging.ca.gov/Programs_and_Services/Medicare_Counseling/) Program name, number and website as listed by the [SHIP National Technical Assistance Center](https://www.shiphelp.org/ships/california/), checked October 15, 2026. The California Department of Aging page lets you find HICAP services in your county. You can also reach Medicare at 1-800-MEDICARE (1-800-633-4227, TTY 1-877-486-2048) or compare plans at [medicare.gov/plan-compare](https://www.medicare.gov/plan-compare/). ## Questions about Medicare Advantage in Contra Costa County ### How many Medicare Advantage plans are in Contra Costa County for 2027? CMS lists 5 general Medicare Advantage plans in Contra Costa County, California for 2027: 4 HMO and 1 PPO. 4 of them include drug coverage. That count leaves out special needs plans (5 more, for people who qualify), cost plans and stand-alone drug plans. ### Are there $0 premium Medicare Advantage plans in Contra Costa County? Yes. 2 of the 5 plans (40%) have a $0 monthly plan premium. You still pay your Part B premium, and the plan may charge copays or coinsurance up to its out-of-pocket maximum. ### Which insurers offer Medicare Advantage plans in Contra Costa County? 3 insurers offer plans in Contra Costa County, California: Imperial Health Plan of California, Inc. (2), Kaiser Permanente (2), Humana (1). ### What is the most I could pay out of pocket in Contra Costa County? In-network out-of-pocket maximums for the 5 plans run from $295 to $6,750 a year, depending on the plan. The maximum covers covered services in the plan's network; it does not include the plan's monthly premium. ### How many Medicare Advantage plans in Contra Costa County have 4 or more stars? 4 of the 5 plans with a 2027 star rating are rated 4 stars or higher. No plans are not yet rated or have too little data, and star ratings are given to the insurer's contract. ## Sources and what is counted Source: [CMS Medicare Advantage and Part D Landscape source file, contract year 2027, release 202609.1](https://www.cms.gov/files/zip/cy2027-landscape-202609-1.zip) (file cy2027-landscape-202609-1.zip, CY2027_Landscape_202609.csv), data last updated September 22, 2026; [CMS 2027 Part C and D Star Ratings data tables](https://www.cms.gov/files/zip/2027-star-ratings-data-tables-oct-8-2026.zip) (Summary Ratings table), October 8, 2026; [U.S. Census Bureau Vintage 2025 county population estimates](https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/totals/co-est2025-alldata.csv) (July 1, 2025). Plans counted by Senior Transition Assistance. A plan is one CMS contract and plan ID offered in Contra Costa County. Counts cover Medicare Advantage and Medicare Advantage with drug coverage plans that are open to everyone. Special needs plans, cost plans, employer-only plans and stand-alone Part D plans are not in the counts above. The $0-premium count uses the combined plan premium (Part C plus Part D) when the plan has drug coverage. Star ratings are CMS overall ratings for plans with drug coverage and Part C summary ratings for plans without. Out-of-pocket maximums are the in-network amounts CMS lists. Figures are for plan year 2027 and come from CMS files dated as shown; the CMS landscape can change before January 1. Confirm any plan's details on Medicare.gov or with the plan. ## Keep reading - [Medicare Advantage plans in 40 large US counties](https://seniortransitionassistance.com/medicare-advantage/counties/) - [Medicare open enrollment dates and changes](https://seniortransitionassistance.com/medicare-advantage/open-enrollment/) - [Medicare Advantage vs. Original Medicare](https://seniortransitionassistance.com/medicare-advantage/vs-original-medicare/) - [Medicare Advantage guide](https://seniortransitionassistance.com/medicare-advantage/) - [Plans in Los Angeles County, CA](https://seniortransitionassistance.com/medicare-advantage/counties/ca/los-angeles-county/) - [Plans in San Diego County, CA](https://seniortransitionassistance.com/medicare-advantage/counties/ca/san-diego-county/) - [Plans in Orange County, CA](https://seniortransitionassistance.com/medicare-advantage/counties/ca/orange-county/) - [Plans in Riverside County, CA](https://seniortransitionassistance.com/medicare-advantage/counties/ca/riverside-county/) - [Plans in San Bernardino County, CA](https://seniortransitionassistance.com/medicare-advantage/counties/ca/san-bernardino-county/) - [Plans in Santa Clara County, CA](https://seniortransitionassistance.com/medicare-advantage/counties/ca/santa-clara-county/) - [Plans in Alameda County, CA](https://seniortransitionassistance.com/medicare-advantage/counties/ca/alameda-county/) - [Plans in Sacramento County, CA](https://seniortransitionassistance.com/medicare-advantage/counties/ca/sacramento-county/) Other California counties with a page: [Los Angeles County](https://seniortransitionassistance.com/medicare-advantage/counties/ca/los-angeles-county/), [San Diego County](https://seniortransitionassistance.com/medicare-advantage/counties/ca/san-diego-county/), [Orange County](https://seniortransitionassistance.com/medicare-advantage/counties/ca/orange-county/), [Riverside County](https://seniortransitionassistance.com/medicare-advantage/counties/ca/riverside-county/), [San Bernardino County](https://seniortransitionassistance.com/medicare-advantage/counties/ca/san-bernardino-county/), [Santa Clara County](https://seniortransitionassistance.com/medicare-advantage/counties/ca/santa-clara-county/), [Alameda County](https://seniortransitionassistance.com/medicare-advantage/counties/ca/alameda-county/), and [Sacramento County](https://seniortransitionassistance.com/medicare-advantage/counties/ca/sacramento-county/). --- Canonical page: https://seniortransitionassistance.com/medicare-advantage/counties/ca/contra-costa-county/