**Exhibit 21**

 

**SUBSIDIARIESOF THE REGISTRANT**

 
| **Name**                                                 | ** ** | **Assumed Names**                              | ** ** | **State of  Incorporation or  Organization** | ** ** |
|----------------------------------------------------------|------------|------------------------------------------------|------------|----------------------------------------------|------------|
| 2000 Orange Avenue, Ltd.                                 |       |                                           |       | Florida                                      |       |
| ARC Development Corporation                              |       |                                           |       | Tennessee                                    |       |
| ARC Dry Creek, Inc.                                 |       |                                           |       | Tennessee                                    |       |
| ARC Financial Services Corporation                       |       |                                           |       | Tennessee                                    |       |
| ARC Kentucky, LLC                                        |       | ARC Kentucky/Louisville, LLC (KY)              |       | Tennessee                                    |       |
| ARC Worcester Center, L.P.                               |       | Arc Worchester Center Limited Partnership (MA) |       | Tennessee                                    |       |
| ARC of Bellingham, L.P.                                  |       |                                           |       | Tennessee                                    |       |
| ARC of Georgia, LLC                                      |       | Premier Surgery Center (GA)                    |       | Tennessee                                    |       |
| ASC of Hammond, Inc                                      |       |                                           |       | Delaware                                     |       |
| ASC of New Albany, LLC                                   |       |                                           |       | Indiana                                      |       |
| Ambulatory Resource Centres Investment Company, LLC      |       |                                           |       | Delaware                                     |       |
| Ambulatory Resource Centres of Florida, Inc.        |       |                                           |       | Florida                                      |       |
| Ambulatory Resource  Centres of Massachusetts, Inc. |       |                                           |       | Tennessee                                    |       |
| Ambulatory Resource Centres of Texas, Inc.          |       |                                           |       | Tennessee                                    |       |
| Ambulatory Resource Centres of  Washington, Inc.    |       |                                           |       | Tennessee                                    |       |
| Ambulatory Resource Centres of  Wilmington, Inc.    |       |                                           |       | Tennessee                                    |       |
| Ambulatory Surgery Center of Cool Springs, LLC           |       |                                           |       | Tennessee                                    |       |
| Ambulatory Surgery Center of Worcester, LLC              |       |                                           |       | Delaware                                     |       |
| Animas Surgical Hospital, LLC                            |       |                                           |       | Delaware                                     |       |
| Austin Surgical Holdings, LLC                            |       |                                           |       | Delaware                                     |       |
| Bayside Endoscopy Center, LLC                            |       |                                           |       | Rhode Island                                 |       |
| Birmingham Surgery Center, LLC                           |       |                                           |       | Delaware                                     |       |
| Boulder Spine Center, LLC                                |       | Minimally Invasive Spine Institute (CO)        |       | Delaware                                     |       |
| Bristol Spine Center, LLC                                |       | Renaissance Surgery Center (TN)                |       | Delaware                                     |       |
| CMMP Surgical Center, L.L.C.                             |       |                                           |       | Missouri                                     |       |
| CSS Services, LLC                                        |       |                                           |       | South Carolina                               |       |
| Cape Coral Ambulatory Surgery Center, LLC                |       |                                           |       | Florida                                      |       |
| Cardinal Sleep Centers of St. Charles, LLC               |       |                                           |       | Illinois                                     |       |
| Central Austin Ambulatory Surgery Center, L.P.           |       |                                           |       | Tennessee                                    |       |
| Chesterfield Spine Center, LLC                           |       |                                           |       | Delaware                                     |       |
| Cypress Surgery Center, LLC                              |       |                                           |       | Delaware                                     |       |
| DSC Anesthesia, LLC                                      |       |                                           |       | Florida                                      |       |
| Deland Surgery Center, LTD.                              |       | Deland Surgery Center                          |       | Flordia                                      |       |
| Dry Creek Surgery Center, LLC                            |       |                                           |       | Colorado                                     |       |
| Fairview Maple Grove Surgery Center, LLC                 |       |                                           |       | Delaware                                     |       |
| HMFW Surgery Center, L.P.                                |       |                                           |       | Texas                                        |       |
| Honolulu Spine Center, LLC                               |       |                                           |       | Delaware                                     |       |
| Houston PSC - I, Inc.                               |       |                                           |       | Texas                                        |       |
| Jacksonville Beach Surgery Center, L.P.                  |       | Jacksonville Beach Surgery Center (FL)         |       | Tennessee                                    |       |
| Kent, LLC                                                |       |                                           |       | Rhode Island                                 |       |
| Lakeside Women’s Center of Oklahoma City, L.L.C.    |       |                                           |       | Oklahoma                                     |       |
| Largo Endoscopy Center, L.P.                             |       | Tampa Bay Regional Surgery Center (FL)         |       | Tennessee                                    |       |
| Largo Surgery, LLC                                       |       | West Bay Surgery Center (FL)                   |       | Florida                                      |       |
| Lubbock Surgicenter, Inc.                           |       |                                           |       | Texas                                        |       |

 

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**SUBSIDIARIESOF THE REGISTRANT**

 
| Medisphere Health Partners - Oklahoma  City, Inc.         |   |                                                              |   | Tennessee |   |
|----------------------------------------------------------------|--------|-------------------------------------------------------------------|--------|-----------|--------|
| Medisphere Health Partners Management of  Tennessee, Inc. |   |                                                              |   | Tennessee |   |
| NSC Edmond, Inc.                                          |   |                                                              |   | Oklahoma  |   |
| NeoSpine Puyallup Spine Center, LLC                            |   | Microsurgical Spine Center (WA)                                   |   | Delaware  |   |
| NeoSpine Surgery of Bristol, LLC                               |   |                                                              |   | Delaware  |   |
| NeoSpine Surgery of Nashville, LLC                             |   |                                                              |   | Delaware  |   |
| NeoSpine Surgery of Puyallup, LLC                              |   |                                                              |   | Delaware  |   |
| NeoSpine Surgery, LLC                                          |   |                                                              |   | Delaware  |   |
| Neospine Surgery, LLC                                          |   |                                                              |   | Tennessee |   |
| New Albany Outpatient Surgery, L.P.                            |   |                                                              |   | Delaware  |   |
| Northeast Baptist Surgery Center, LLC                          |   |                                                              |   | Texas     |   |
| Northstar Hospital, LLC                                        |   |                                                              |   | Delaware  |   |
| Northstar Surgical Center, L.P.                                |   |                                                              |   | Texas     |   |
| Novi Surgery Center, LLC                                       |   |                                                              |   | Michigan  |   |
| One Nineteen ASC, LLC                                          |   |                                                              |   | Delaware  |   |
| Orange City Surgical, LLC                                      |   | Blue Springs Surgery Center (FL)                                  |   | Delaware  |   |
| Orlando Surgery Center II, Ltd.                                |   | Orlando Surgery Center (FL)                                       |   | Florida   |   |
| Orlando Surgery Center Real Estate Partnership,  Ltd.          |   |                                                              |   | Florida   |   |
| Orthopaedic Surgery Center of Asheville, L.P.                  |   | Orthopaedic Surgery Center of Asheville, Limited Partnership (NC) |   | Tennessee |   |
| PMCROS, L.L.C.                                                 |   |                                                              |   | Louisiana |   |
| PSC Development Company, LLC                                   |   |                                                              |   | Delaware  |   |
| PSC Operating Company, LLC                                     |   |                                                              |   | Delaware  |   |
| PSC of New York, L.L.C.                                        |   |                                                              |   | Delaware  |   |
| Physicians Medical Center, L.L.C.                              |   |                                                              |   | Louisiana |   |
| Physicians Surgery Center, LLC                                 |   | Lee Island Coast Surgery Center (FL)                              |   | Delaware  |   |
| Physicians Surgical Care, Inc.                            |   |                                                              |   | Delaware  |   |
| Pickaway Surgical Center, Ltd.                                 |   | Physicians Ambulatory Surgery Center                              |   | Ohio      |   |
| Portsmouth, LLC                                                |   |                                                              |   | Delaware  |   |
| Premier Ambulatory Surgery of  Duncanville, Inc.          |   |                                                              |   | Delaware  |   |
| Premier Orthopaedic Surgery Center, LLC                        |   |                                                              |   | Tennessee |   |
| Quahog Holding Company, LLC                                    |   |                                                              |   | Delaware  |   |
| Recovery Care, Inc.                                       |   |                                                              |   | Illinois  |   |
| Recovery Care, L.P.                                            |   |                                                              |   | Illinois  |   |
| SARC/Asheville, Inc.                                      |   |                                                              |   | Tennessee |   |
| SARC/Circleville, Inc.                                    |   |                                                              |   | Tennessee |   |
| SARC/Columbia, Inc.                                       |   |                                                              |   | Tennessee |   |
| SARC/Deland, Inc.                                         |   |                                                              |   | Tennessee |   |
| SARC/FW, Inc.                                             |   |                                                              |   | Tennessee |   |
| SARC/Ft. Myers, Inc.                                      |   |                                                              |   | Tennessee |   |
| SARC/Georgia, Inc.                                        |   |                                                              |   | Tennessee |   |
| SARC/Jacksonville, Inc.                                   |   |                                                              |   | Tennessee |   |
| SARC/Kent, LLC                                                 |   |                                                              |   | Tennessee |   |
| SARC/Knoxville, Inc.                                      |   |                                                              |   | Tennessee |   |
| SARC/Largo Endoscopy, Inc.                                |   |                                                              |   | Tennessee |   |
| SARC/Largo, Inc.                                          |   |                                                              |   | Tennessee |   |
| SARC/Metairie, Inc                                             |   |                                                              |   | Tennessee |   |

 

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**SUBSIDIARIESOF THE REGISTRANT**

 
| SARC/Providence, LLC                             |   |   |   | Tennessee  |   |
|--------------------------------------------------|--------|--------|--------|------------|--------|
| SARC/San Antonio, LLC                            |   |   |   | Tennessee  |   |
| SARC/Savannah, Inc.                         |   |   |   | Tennessee  |   |
| SARC/St. Charles, Inc.                      |   |   |   | Tennessee  |   |
| SARC/Vincennes, Inc.                        |   |   |   | Tennessee  |   |
| SARC/West Houston, LLC                           |   |   |   | Tennessee  |   |
| SARC/Worcester, Inc.                        |   |   |   | Tennessee  |   |
| SI/Dry Creek, Inc.                          |   |   |   | Tennessee  |   |
| SI/ERIE, Inc.                               |   |   |   | Tennessee  |   |
| SMBI Havertown, LLC                              |   |   |   | Tennessee  |   |
| SMBI Northstar, LLC                              |   |   |   | Tennessee  |   |
| SMBI OSE, LLC                                    |   |   |   | Alabama    |   |
| SMBI Portsmouth, LLC                             |   |   |   | Tennessee  |   |
| SMBIMS 119, LLC                                  |   |   |   | Tennessee  |   |
| SMBIMS Birmingham, Inc.                     |   |   |   | Tennessee  |   |
| SMBIMS Durango, LLC                              |   |   |   | Tennessee  |   |
| SMBIMS Elk River, LLC                            |   |   |   | Tennessee  |   |
| SMBIMS Florida I, LLC                            |   |   |   | Florida    |   |
| SMBIMS Greenville, LLC                           |   |   |   | Tennessee  |   |
| SMBIMS Kirkwood, LLC                             |   |   |   | Tennessee  |   |
| SMBIMS Maple Grove, LLC                          |   |   |   | Tennessee  |   |
| SMBIMS Novi, LLC                                 |   |   |   | Tennessee  |   |
| SMBIMS Orange City, LLC                          |   |   |   | Tennessee  |   |
| SMBIMS Steubenville, Inc.                   |   |   |   | Tennessee  |   |
| SMBIMS Tampa, LLC                                |   |   |   | Tennessee  |   |
| SMBIMS Temple, LLC                               |   |   |   | Tennessee  |   |
| SMBIMS Tuscaloosa, Inc.                     |   |   |   | Tennessee  |   |
| SMBIMS Wichita, LLC                              |   |   |   | Tennessee  |   |
| SMBISS Arcadia, LLC                              |   |   |   | Tennessee  |   |
| SMBISS Beverly Hills, LLC                        |   |   |   | Tennessee  |   |
| SMBISS Chesterfield, LLC                         |   |   |   | Tennessee  |   |
| SMBISS Encino, LLC                               |   |   |   | Tennessee  |   |
| SMBISS Irvine, LLC                               |   |   |   | Tennessee  |   |
| SMBISS Roswell, LLC                              |   |   |   | Tennessee  |   |
| SMBISS Sandy Springs, LLC                        |   |   |   | Tennessee  |   |
| SMBISS Thousand Oaks, LLC                        |   |   |   | Tennessee  |   |
| South Shore Operating Company, LLC               |   |   |   | Delaware   |   |
| Specialty Surgical Center of Arcadia, L.P.       |   |   |   | California |   |
| Specialty Surgical Center of Arcadia, LLC        |   |   |   | California |   |
| Specialty Surgical Center of Beverly Hills, L.P. |   |   |   | California |   |
| Specialty Surgical Center of Encino, L.P.        |   |   |   | California |   |
| Specialty Surgical Center of Encino, LLC         |   |   |   | California |   |
| Specialty Surgical Center of Irvine, L.P.        |   |   |   | California |   |
| Specialty Surgical Center of Irvine, LLC         |   |   |   | California |   |
| Specialty Surgical Center of Thousand Oaks, L.P. |   |   |   | California |   |
| Specialty Surgical Center of Thousand Oaks, LLC  |   |   |   | California |   |

 

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**SUBSIDIARIESOF THE REGISTRANT**

 
| Specialty Surgical Center, LLC                        |   |                                                                              |   | California |   |
|-------------------------------------------------------|--------|-----------------------------------------------------------------------------------|--------|------------|--------|
| Surgery Center Partners, LLC                          |   | Timeberlake Surgery Center (MO)                                                   |   | Delaware   |   |
| Surgery Center of Duncanville, L.P.                   |   |                                                                              |   | Texas      |   |
| Surgery Center of Hammond, LLC                        |   | St. Luke’s Surgery Center (LA)                                               |   | Delaware   |   |
| Surgery Center of Pennsylvania, LLC                   |   |                                                                              |   | Delaware   |   |
| Surgicare of Deland, Inc.                        |   |                                                                              |   | Florida    |   |
| Symbion Ambulatory Resource Centres, Inc.        |   |                                                                              |   | Tennessee  |   |
| Symbion Employee Relief Disaster Relief Fund          |   |                                                                              |   | Tennessee  |   |
| Symbion Holdings Corporation                          |   |                                                                              |   | Delaware   |   |
| Symbion Imaging, Inc.                            |   |                                                                              |   | Tennessee  |   |
| Symbion, Inc.                                    |   |                                                                              |   | Delaware   |   |
| SymbionARC Management Services, Inc.             |   |                                                                              |   | Tennessee  |   |
| SymbionARC Support Services, LLC                      |   |                                                                              |   | Tennessee  |   |
| Texarkana Surgery Center GP, Inc.                |   |                                                                              |   | Texas      |   |
| Texarkana Surgery Center, L.P.                        |   |                                                                              |   | Delaware   |   |
| The Center for Special Surgery, LLC                   |   |                                                                              |   | Delaware   |   |
| The Hand Surgery Center of Louisiana, L.P.            |   | Greater New Orleans Surgery Center and The Hand Surgery Center of  Louisiana (LA) |   | Tennessee  |   |
| The Surgery Center of Ocala, LLC                      |   |                                                                              |   | Tennessee  |   |
| The Surgery Center of Temple, LLC                     |   |                                                                              |   | Delaware   |   |
| The Surgery Center, LLC                               |   |                                                                              |   | Georgia    |   |
| UniPhy Healthcare of Eugene/Springfield  I, Inc. |   |                                                                              |   | Tennessee  |   |
| UniPhy Healthcare of Johnson City VI, LLC             |   |                                                                              |   | Tennessee  |   |
| UniPhy Healthcare of Louisville, Inc.            |   |                                                                              |   | Tennessee  |   |
| UniPhy Healthcare of Maine I, Inc.               |   |                                                                              |   | Tennessee  |   |
| UniPhy Healthcare of Memphis I, LLC                   |   |                                                                              |   | Tennessee  |   |
| UniPhy Healthcare of Memphis II, Inc.            |   |                                                                              |   | Tennessee  |   |
| UniPhy Healthcare of Memphis III, LLC                 |   |                                                                              |   | Tennessee  |   |
| UniPhy Healthcare of Memphis IV, LLC                  |   |                                                                              |   | Tennessee  |   |
| VASC, Inc.                                       |   |                                                                              |   | Illinois   |   |
| Valley Ambulatory Surgery Center, L.P.                |   |                                                                              |   | Illinois   |   |
| Valley Medical Inn, L.P.                              |   |                                                                              |   | Illinois   |   |
| Valley Sleep Centers, LLC                             |   |                                                                              |   | Illinois   |   |
| Valley Surgical Center, Ltd.                          |   |                                                                              |   | Ohio       |   |
| Village Surgicenter, Inc.                        |   |                                                                              |   | Delaware   |   |
| Village Surgicenter, Limited Partnership              |   |                                                                              |   | Delaware   |   |
| Vincennes Surgery Center, L.P.                        |   |                                                                              |   | Delaware   |   |
| Wilmington Surgery Center, L.P.                       |   |                                                                              |   | Tennessee  |   |

 

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