Medicare Advantage plans in Contra Costa County, CA: what changed for 2027
For 2027, Contra Costa County in California has 4 Medicare Advantage plans that include drug coverage, compared with 5 in 2026, according to the CMS plan landscape files.
Companies no longer offering Advantage plans here in 2027
- UnitedHealth Group, Inc.
If you are in one of their plans, you should have received a notice. You can choose a new plan during Open Enrollment, and special enrollment rules can apply when a plan leaves your area.
1 Advantage plan IDs (not counting Special Needs or Cost plans) listed here for 2026 are not in the 2027 file and 0 plan IDs are new. Some of these are the same plan renamed or merged, so check the Annual Notice of Change from your plan.
How many people here are in Medicare Advantage
In October 2026, 120,690 of the 231,169 people eligible for Medicare in Contra Costa County were enrolled in a Medicare Advantage or other Medicare health plan, 52.2%. A year earlier it was 119,732 of 225,133 (53.2%).
CMS counts enrollees in all Medicare health plans, including Advantage, cost and PACE plans, by the county where they live.
Before you choose a plan
Compare plans for your ZIP code, drugs and doctors on the official Medicare Plan Finder, or call 1-800-MEDICARE (1-800-633-4227). Free, unbiased counselling is available from your State Health Insurance Assistance Program at shiphelp.org.
Advantage plans with drug coverage for 2027 (4)
| Plan | Company | Type | Monthly premium | In-network out-of-pocket limit | Star rating |
|---|---|---|---|---|---|
| Imperial Dynamic Plan (HMO) | Imperial Health Plan of California, Inc. | HMO | $0 | $295 | 4 of 5 |
| Kaiser Permanente Sr Adv Basic Contra Costa (HMO) | Kaiser Permanente | HMO | $29.00 | $6,000 | 4.5 of 5 |
| HumanaChoice H5525-084 (PPO) | Humana | PPO | $93.00 | $6,750 | 4 of 5 |
| Kaiser Permanente Sr Adv Enhanced Contra Costa (HMO) | Kaiser Permanente | HMO | $98.00 | $3,900 | 4.5 of 5 |
Advantage plans without drug coverage for 2027 (1)
| Plan | Company | Type | Monthly premium | In-network out-of-pocket limit | Star rating |
|---|---|---|---|---|---|
| Imperial Courage Plan (HMO) | Imperial Health Plan of California, Inc. | HMO | Not listed | $2,999 | 4 of 5 |
Special Needs Plans for 2027 (5)
| Plan | Company | Type | Monthly premium | In-network out-of-pocket limit | Star rating |
|---|---|---|---|---|---|
| Imperial Senior Value (HMO C-SNP) | Imperial Health Plan of California, Inc. | HMO C-SNP · Chronic or Disabling Condition | $0 | $295 | 4 of 5 |
| Kaiser Permanente Dual Complete North P17 (HMO D-SNP) | Kaiser Permanente | HMO D-SNP · Dual-Eligible | $0 | $9,850 | 4.5 of 5 |
| UHC Complete Care Support CA-8AP (HMO-POS C-SNP) | UnitedHealthcare | HMO-POS C-SNP · Chronic or Disabling Condition | $0 | $9,850 | 3 of 5 |
| Imperial Flex (HMO C-SNP) | Imperial Health Plan of California, Inc. | HMO C-SNP · Chronic or Disabling Condition | $2.70 | $9,850 | 4 of 5 |
| Contra Costa Health Care Plus (HMO D-SNP) | Contra Costa Health Care Plus (HMO D-SNP) | HMO D-SNP · Dual-Eligible | $7.30 | $9,850 | Plan Too New To Be Measured |
Stand-alone Part D drug plans are offered statewide: see California drug plans.
Sources
- Centers for Medicare & Medicaid Services, CY2027 Medicare Advantage and Part D Landscape file (data last updated 18 October 2026)
- Centers for Medicare & Medicaid Services, CY2026 Medicare Advantage and Part D Landscape file (September 2026 release)
- Centers for Medicare & Medicaid Services, MA State/County Penetration files, October 2026 and October 2025
Checked 29 October 2026. Plans and premiums can change before 1 January 2027. Confirm any plan on Medicare.gov before you enrol.