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Medicare plans in Contra Costa County, CA — 2027
What agents look up before working a county: plan count, carriers, $0-premium share, star distribution, MOOP range, the 65+ and 60–64 population, and what changed since last year.
In 2027, Contra Costa County, California has 20 Medicare plans (4 Medicare Advantage with drug coverage, 1 without, 10 standalone Part D, 5 Special Needs) from 8 carriers. 5 Medicare Advantage plans have a $0 premium. The lowest in-network out-of-pocket maximum is $295.
What changed vs 2026
- 3 fewer plans than 2026
- Carriers exited: Aetna Medicare, Central Health Medicare Plan
- Average star rating up 0.4
Market snapshot
- Residents 65 and older
- 199,270
- Residents 60–64, aging in over the next five years
- 74,559
- Medicare eligibles
- 231,169
- Medicare Advantage penetration
- 52.2%
- Plans per 1,000 residents 65+
- 0.1
Carriers by number of plans
- Humana — 4 plans
- Imperial Health Plan of California, Inc. — 4 plans
- Kaiser Permanente — 3 plans
- UnitedHealthcare — 3 plans
- Blue Shield of California — 2 plans
- Wellcare — 2 plans
- Contra Costa Health Care Plus (HMO D-SNP) — 1 plan
- HealthSpring — 1 plan
Plans sorted by CMS star rating, then premium
| Plan | Carrier | Category | Plan type | Monthly premium | Drug deductible | Out-of-pocket maximum | Star rating |
|---|---|---|---|---|---|---|---|
| Kaiser Permanente Dual Complete North P17 (HMO D-SNP) (H8794-017-0) | Kaiser Permanente | SNP | HMO D-SNP | $0 | $700 | $9,850 | 4.5 |
| Kaiser Permanente Sr Adv Basic Contra Costa (HMO) (H0524-061-0) | Kaiser Permanente | MA-PD | HMO | $29 | $0 | $6,000 | 4.5 |
| Kaiser Permanente Sr Adv Enhanced Contra Costa (HMO) (H0524-033-0) | Kaiser Permanente | MA-PD | HMO | $98 | $0 | $3,900 | 4.5 |
| Humana Basic Rx Plan (PDP) (S5884-114-0) | Humana | PDP | PDP | $118.30 | $700 | 4.5 | |
| Humana Value Rx Plan (PDP) (S5884-211-0) | Humana | PDP | PDP | $130.30 | $687 | 4.5 | |
| Humana Premier Rx Plan (PDP) (S5884-178-0) | Humana | PDP | PDP | $191.20 | $350 | 4.5 | |
| Imperial Courage Plan (HMO) (H5496-016-0) | Imperial Health Plan of California, Inc. | MA | HMO | $0 | $2,999 | 4.0 | |
| Imperial Dynamic Plan (HMO) (H5496-012-0) | Imperial Health Plan of California, Inc. | MA-PD | HMO | $0 | $0 | $295 | 4.0 |
| Imperial Senior Value (HMO C-SNP) (H5496-005-0) | Imperial Health Plan of California, Inc. | SNP | HMO C-SNP | $0 | $0 | $295 | 4.0 |
| Imperial Flex (HMO C-SNP) (H5496-017-0) | Imperial Health Plan of California, Inc. | SNP | HMO C-SNP | $2.70 | $450 | $9,850 | 4.0 |
Showing 10 of 20 plans.
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About this data
Source: CMS Medicare Advantage/Part D Landscape files, plan year 2027; population: U.S. Census Bureau ACS 5-year 2024; MA penetration: CMS October 2026.
This page summarizes publicly available CMS data. It is not a plan finder and does not recommend plans. To compare and enroll in plans, use Medicare.gov or talk to a licensed agent. Medicare.gov plan finder.