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            "identity": "unclassified:106494048",
            "systemName": "AURORA BEHAVIORAL HEALTHCARE-SANTA ROSA, LLC",
            "ahrqSystemLinked": false,
            "discharges": 54,
            "share": 0.003201
          }
        ]
      },
      {
        "county": "Yuba",
        "totalInpatientDischarges": 9442,
        "reportingFacilities": 128,
        "hhi": 3005.9,
        "topFourShare": 0.762021,
        "topFacilityShare": 0.526901,
        "topFacilities": [
          {
            "facilityId": "106580996",
            "facilityName": "ADVENTIST HEALTH AND RIDEOUT",
            "discharges": 4975,
            "share": 0.526901
          },
          {
            "facilityId": "106311000",
            "facilityName": "SUTTER ROSEVILLE MEDICAL CENTER",
            "discharges": 866,
            "share": 0.091718
          },
          {
            "facilityId": "106341006",
            "facilityName": "UNIVERSITY OF CALIFORNIA DAVIS MEDICAL CENTER",
            "discharges": 772,
            "share": 0.081762
          },
          {
            "facilityId": "106314024",
            "facilityName": "KAISER FOUNDATION HOSPITAL - ROSEVILLE",
            "discharges": 582,
            "share": 0.061639
          },
          {
            "facilityId": "106341051",
            "facilityName": "SUTTER MEDICAL CENTER, SACRAMENTO",
            "discharges": 480,
            "share": 0.050837
          },
          {
            "facilityId": "106040937",
            "facilityName": "OROVILLE HOSPITAL",
            "discharges": 204,
            "share": 0.021606
          },
          {
            "facilityId": "106340950",
            "facilityName": "MERCY SAN JUAN MEDICAL CENTER",
            "discharges": 127,
            "share": 0.013451
          },
          {
            "facilityId": "106040962",
            "facilityName": "ENLOE HEALTH",
            "discharges": 122,
            "share": 0.012921
          },
          {
            "facilityId": "106291023",
            "facilityName": "SIERRA NEVADA MEMORIAL HOSPITAL",
            "discharges": 115,
            "share": 0.01218
          },
          {
            "facilityId": "106514001",
            "facilityName": "SUTTER-YUBA PSYCHIATRIC HEALTH FACILITY",
            "discharges": 81,
            "share": 0.008579
          }
        ],
        "systemReportingIdentities": 63,
        "systemHhi": 3302.0,
        "systemLinkedFacilities": 97,
        "systemLinkedDischarges": 9186,
        "systemLinkedDischargeShare": 0.972887,
        "ccnLinkedDischarges": 9325,
        "systemTopFourShare": 0.867507,
        "topSystemIdentityShare": 0.534209,
        "topSystems": [
          {
            "identity": "ahrq:HSI00000011",
            "systemName": "Adventist Health",
            "ahrqSystemLinked": true,
            "discharges": 5044,
            "share": 0.534209
          },
          {
            "identity": "ahrq:HSI00001050",
            "systemName": "Sutter Health",
            "ahrqSystemLinked": true,
            "discharges": 1582,
            "share": 0.167549
          },
          {
            "identity": "ahrq:HSI00001168",
            "systemName": "University of California Health",
            "ahrqSystemLinked": true,
            "discharges": 859,
            "share": 0.090976
          },
          {
            "identity": "ahrq:HSI00000536",
            "systemName": "Kaiser Permanente",
            "ahrqSystemLinked": true,
            "discharges": 706,
            "share": 0.074772
          },
          {
            "identity": "ahrq:HSI00001427",
            "systemName": "CommonSpirit Health",
            "ahrqSystemLinked": true,
            "discharges": 412,
            "share": 0.043635
          },
          {
            "identity": "ahrq:HSI00001546",
            "systemName": "OroHealth Corporation",
            "ahrqSystemLinked": true,
            "discharges": 204,
            "share": 0.021606
          },
          {
            "identity": "ahrq:HSI00001148",
            "systemName": "Universal Health Services",
            "ahrqSystemLinked": true,
            "discharges": 134,
            "share": 0.014192
          },
          {
            "identity": "ahrq:HSI00000345",
            "systemName": "Enloe Medical Center",
            "ahrqSystemLinked": true,
            "discharges": 122,
            "share": 0.012921
          },
          {
            "identity": "unclassified:106514001",
            "systemName": "SUTTER-YUBA PSYCHIATRIC HEALTH FACILITY",
            "ahrqSystemLinked": false,
            "discharges": 81,
            "share": 0.008579
          },
          {
            "identity": "unclassified:106494048",
            "systemName": "AURORA BEHAVIORAL HEALTHCARE-SANTA ROSA, LLC",
            "ahrqSystemLinked": false,
            "discharges": 44,
            "share": 0.00466
          }
        ]
      }
    ],
    "summary": {
      "countiesWithData": 58,
      "totalInpatientDischarges": 3661942,
      "systemLinkedDischarges": 3268359,
      "systemLinkedDischargeShare": 0.892521,
      "medianHhi": 1986.1,
      "medianSystemHhi": 2552.85,
      "medianTopFourShare": 0.72,
      "medianSystemTopFourShare": 0.83
    },
    "method": "Within each California residence county, combine the disjoint Inpatient (not from ED) and Inpatient from ED settings; exclude ED Only and AS Only. Aggregate by stable facility ID, not name. Shares divide each facility's inpatient discharges by all included discharges for that county. HHI is the sum of squared percentage shares (0\u201310,000). System HHI groups only explicit AHRQ 2023 system IDs reached through documented HCAI-to-CCN links; all others remain separately identified and unclassified.",
    "limitation": "The patient-origin population is broader than the 299-hospital comparable financial cohort; discharge totals are not interchangeable. Residence counties are descriptive screens, not antitrust markets. No adjustment for service, payer or travel time is made. Non-California and unknown residences are excluded and tabulated. AHRQ 2023 affiliations predate 2024 flows. Unclassified does not mean independent; incomplete system linkage may understate concentration. This raw workbook contains numeric counts; suppression rules from other HCAI products are not assumed."
  }
}