Hospitals in Contra Costa County, California
8 Medicare-certified hospitals, sorted by CMS overall rating (a national standard — not curved within California). “Not rated” is CMS’s own suppression, never a judgment.
| Hospital | City | CMS rating | ER |
|---|---|---|---|
| Contra Costa Regional Medical Center | Martinez | ★★★★★4 | Yes |
| John Muir Medical Center - Concord Campus | Concord | ★★★★★4 | Yes |
| San Ramon Regional Medical Center | San Ramon | ★★★★★4 | Yes |
| Kaiser Foundation Hospital - Walnut Creek | Walnut Creek | ★★★★★3 | Yes |
| Sutter Delta Medical Center | Antioch | ★★★★★3 | Yes |
| John Muir Medical Center - Walnut Creek Campus | Walnut Creek | ★★★★★2 | Yes |
| Kaiser Foundation Hospital - Antioch | Antioch | ★★★★★1 | Yes |
| John Muir Behavioral Health Center | Concord | not rated | Yes |
Data: Centers for Medicare & Medicaid Services (data.cms.gov), last updated April 28, 2026. This site is not affiliated with CMS or any government agency.