With Trio, you have access to a specially selected network of doctors, hospitals, and specialists who are committed to working together to deliver a better healthcare experience.
You and your dependents must live or work in the Trio HMO plan service area to be eligible for coverage. See the Evidence of Coverage for a complete description of benefits, exclusions, limitations, and conditions of coverage of the plans.
How to search the Trio network
Use Blue Shield's Find a Doctor tool to search for doctors, hospitals, specialists, and more within the Trio network.
Not sure if Trio plans are available in your area? Use our Trio ZIP code tool.
Trio availability by county
The Trio network extends throughout select California counties.
| Alameda (F) | Marin (P) | San Bernardino (P) | Santa Clara (F) |
| Contra Costa (F) | Monterey (P) | San Diego (P) | Santa Cruz (F) |
| El Dorado (P) | Nevada (P) | San Francisco (F) | Solano (P) |
| Fresno (P) | Orange (F) | San Joaquin (F) | Stanislaus (P) |
| Kern (P) | Placer (P) | San Luis Obispo (P) | Tulare (P) |
| Kings (P) | Riverside (P) | San Mateo (F) | Ventura (P) |
| Los Angeles (P) | Sacramento (P) | Santa Barbara (P) | Yolo (P) |
Partial (P) = The Trio network is available only in parts of this county.
Full (F) = The Trio network is available throughout the full county.
The Trio network
Medical groups: The Trio network (PDF, 84 KB) includes a subset of physicians, Independent Practice Associations (IPAs), medical groups, and affiliated physicians from our full HMO network.
Hospitals: The Trio network (PDF, 84 KB) includes a list of the hospitals that physicians from the Trio IPAs and medical groups listed above typically refer to. For a complete list of hospitals available in the Trio network, please use Blue Shield’s Find a Doctor tool.
