Surgery Center Benchmarks

Surgery centers in California

933 Medicare-certified centers across 28 metro areas. 604 report quality measures, 414 have patient-survey scores.

Metro areas

Outside any metro area

12 centers CMS files with a rural area code or no CBSA at all. They have no metro page, so this is where they live — not because they matter less, but because "which metro" is not a question the federal record answers for them.

Center City Specialties ORs Hospital visits after surgery
GRASS VALLEY SURGERY CENTER GRASS VALLEY Foot surgeryOB/GYN surgeryOrthopedic surgery +3 2 As expected Orthopedic
SIERRA AMBULATORY SURGERY CENTER, LLC GRASS VALLEY OphthalmologyPain managementOther surgery 2 As expected Orthopedic
SIERRA ENDOSCOPY CENTER, LLC GRASS VALLEY Other surgery 2 As expected Colonoscopy
SONORA EYE SURGERY CENTER SONORA Ophthalmology 3 no case volume reported
HUMBOLDT PHYSICIANS SURGERY AND LASER CENTER, LLC EUREKA Ophthalmology 1 no case volume reported
KAISER FOUNDATION HOSPITAL AMBULATORY SURGERY CENTER, ANTELOPE VALLEY LANCASTER not filed — no case volume reported
Synergy Surgery Center of San Diego LLC San Diego not filed — no case volume reported
TRUCKEE SURGERY CENTER TRUCKEE Dental surgeryFoot surgeryOB/GYN surgery +3 2 As expected Orthopedic
SPECIALTY CARE AND SURGERY CENTER KELSEYVILLE OB/GYN surgery 1 no case volume reported
BIOHEALTH SURGICAL INSTITUTE SANTA MONICA not filed — no case volume reported
GRACE SURGERY CENTER INC NEWHALL not filed — no case volume reported
United Surgery Center Carlsbad LLC Carlsbad not filed — no case volume reported

Sources: CMS Provider of Services file (iQIES, 2026 Q2) for the facility list, specialties and room counts; CMS ASCQR facility-level quality measures; CMS OAS CAHPS patient survey. Metro areas are U.S. Census Bureau delineations — see the methodology.