EXHIBIT21

SUBSIDIARIES OF THE COMPANY

| SubsidiariesIncorporated or Organized in the State of Arizona                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   | Percentage of VotingPower                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Arrowhead MOB JointVenture Pleasant Properties, Inc.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   | 80% 100%                                                                                                                                                                        |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |                                                                                                                                                                            |
| SubsidiariesIncorporated or Organized in the State of Delaware                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   | Percentage of VotingPower                                                                                                                                                       |
| VHS AcquisitionCorporation VHS of Phoenix, Inc. VHS Outpatient Clinics, Inc. VHS of Arrowhead, Inc. VHS of South Phoenix, Inc. The VHS Arizona Imaging Centers Limited Partnership VHS Imaging Centers, Inc. VHS of Anaheim, Inc. VHS of Orange County, Inc. VHS Holding Company, Inc. VHS of Huntington Beach, Inc. The Anaheim VHS Limited Partnership The Huntington Beach VHS Limited Partnership VHS of Illinois, Inc. VHS Genesis Labs, Inc. MacNeal Medical Records, Inc. Vanguard Health Management, Inc. Trinity Medcare, Inc. VHS Acquisition Subsidiary Number 1, Inc. VHS Acquisition Subsidiary Number 2, Inc. VHS Acquisition Subsidiary Number 3, Inc. VHS Acquisition Subsidiary Number 4, Inc. VHS Acquisition Subsidiary Number 5, Inc. VHS Acquisition Subsidiary Number 6, Inc. VHS Acquisition Subsidiary Number 7, Inc. VHS Acquisition Subsidiary Number 8, Inc. VHS Acquisition Subsidiary Number 9, Inc. VHS Acquisition Subsidiary Number 10, Inc. VHS Phoenix Health Plan, Inc. Hospital Development of West Phoenix, Inc. Hospital Development Company Number 1, Inc. Hospital Development Company Number 2, Inc. Magnolia Surgery Center Limited Partnership |   | 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100%   99% |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |                                                                                                                                                                            |
| SubsidiariesIncorporated or Organized in the State of California                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   | Percentage of VotingPower                                                                                                                                                       |
| North Anaheim Surgicenter,Ltd.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   |   75%                                                                                                                                                                 |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |                                                                                                                                                                            |
| SubsidiariesIncorporated or Organized in the District ofColumbia                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   | Percentage of VotingPower                                                                                                                                                       |
| Healthcare Compliance,L.L.C.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |   | 100%                                                                                                                                                                            |

SUBSIDIARIES OF THE COMPANY

| SubsidiariesIncorporated or Organized in the State of Illinois                                                                                                                                                                                   |   | Percentage of VotingPower                       |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-------------------------------------------------|
| MacNeal Health Providers,Inc. MacNeal Management Services, Inc. Midwest Claims Processing, Inc. Primary Care Physicians Center, LLC Pros Temporary Staffing, Inc. Watermark Physician Services, Inc. The 6300 West Roosevelt Limited Partnership |   | 100% 100% 100%   94% 100% 100% 50.33% |
|                                                                                                                                                                                                                                             |   |                                            |
| SubsidiariesIncorporated or Organized in the State of New Jersey                                                                                                                                                                                 |   | Percentage of VotingPower                       |
| VHS of Rancocas,Inc.                                                                                                                                                                                                                             |   | 100%                                            |
|                                                                                                                                                                                                                                             |   |                                            |
| SubsidiariesIncorporated or Organized in the Commonwealth of Pennsylvania                                                                                                                                                                        |   | Percentage of VotingPower                       |
| V-II Acquisition Co.,Inc.                                                                                                                                                                                                                        |   | 100%                                            |
|                                                                                                                                                                                                                                             |   |                                            |
| SubsidiariesIncorporated or Organized in the State of Tennessee                                                                                                                                                                                  |   | Percentage of VotingPower                       |
| Vanguard Health FinancialCompany, Inc.                                                                                                                                                                                                           |   | 100%                                            |