**Exhibit 21**

 

**SUBSIDIARIESOF THE REGISTRANT**

 
| **Name**                                                       | ** ** | **Assumed  Name**                                   | ** ** | **State of  Incorporation  or Organization** |
|----------------------------------------------------------------|------------|-----------------------------------------------------|------------|----------------------------------------------|
|                                                           |       |                                                |       |                                         |
| 2000  Orange Avenue, Ltd.                                      |       |                                                |       | Florida                                      |
| 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                                     |
| ARC  Development Corporation                                   |       |                                                |       | Tennessee                                    |
| ARC  Dry Creek, Inc.                                      |       |                                                |       | Tennessee                                    |
| ARC  Financial Services Corporation                            |       |                                                |       | Tennessee                                    |
| ARC  Kentucky, LLC                                             |       | ARC  Kentucky/Louisville, LLC (KY)                  |       | Tennessee                                    |
| ARC  of Bellingham, L.P.                                       |       |                                                |       | Tennessee                                    |
| ARC  of Georgia, LLC                                           |       | Premier  Surgery Center (GA)                        |       | Tennessee                                    |
| ARC  Worcester Center, L.P.                                    |       | ARC  Worcester Center Limited Partnership (MA)      |       | Tennessee                                    |
| ASC  of Hammond, Inc                                           |       |                                                |       | Delaware                                     |
| ASC  of New Albany, LLC                                        |       |                                                |       | Indiana                                      |
| Austin  Surgical Holdings, LLC                                 |       | ATX  Surgical Holdings, LLC (TX)                    |       | 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                                     |
| Cape  Coral Ambulatory Surgery Center, LLC                     |       |                                                |       | Florida                                      |
| CAPE  CORAL ANESTHESIA SERVICES, LLC                           |       |                                                |       | Florida                                      |
| Cardinal  Sleep Centers of St. Charles, LLC                    |       |                                                |       | Illinois                                     |
| Central  Austin Ambulatory Surgery Center, L.P.                |       | Central  Park Surgery Center (TX)                   |       | Tennessee                                    |
| Chesterfield  Spine Center, LLC                                |       | St.  Louis Spine and Orthopedic Surgery Center (MO) |       | Delaware                                     |
| CMMP  Surgical Center, L.L.C.                                  |       |                                                |       | Missouri                                     |
| Physicians  Surgery Center, LLC                                |       |                                                |       | Delaware                                     |
| CSS  Services, LLC                                             |       |                                                |       | South Carolina                               |
| Cypress  Surgery Center, LLC                                   |       |                                                |       | Delaware                                     |
| Deland  Surgery Center, LTD.                                   |       | Deland  Surgery Center (FL)                         |       | Florida                                      |
| Dry  Creek Surgery Center, LLC                                 |       |                                                |       | Colorado                                     |
| DSC  Anesthesia, LLC                                           |       |                                                |       | Florida                                      |
| East  Memphis Urology Center, L.P.                             |       |                                                |       | Tennessee                                    |
| Gresham  Station Surgery Center, LLC                           |       |                                                |       | Oregon                                       |
| HMFW  Surgery Center, L.P.                                     |       |                                                |       | Texas                                        |
| Honolulu  Spine Center, LLC                                    |       |                                                |       | Delaware                                     |
| Houston  PSC - I, Inc.                                    |       |                                                |       | Texas                                        |
| Independence  Surgery Center, LLC                              |       |                                                |       | Delaware                                     |
| 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                                        |
| Medisphere  Health Partners - Oklahoma City, Inc.         |       |                                                |       | Tennessee                                    |
| Medisphere  Health Partners Management of Tennessee, Inc. |       |                                                |       | Tennessee                                    |
| 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                                     |
| New  Albany Outpatient Surgery, L.P.                           |       |                                                |       | Delaware                                     |
| Northeast  Baptist Surgery Center, LLC                         |       | Village  Specialty Surgical Center (TX)             |       | Texas                                        |
| Northstar  Hospital, LLC                                       |       |                                                |       | Delaware                                     |
| Northstar  Surgical Center, L.P.                               |       |                                                |       | Texas                                        |
| Novi  Surgery Center, LLC                                      |       |                                                |       | Michigan                                     |
| NSC  Edmond, Inc.                                         |       |                                                |       | Oklahoma                                     |
| One  Nineteen ASC, LLC                                         |       |                                                |       | Delaware                                     |
| Orange  City Surgical, LLC                                     |       | Blue  Springs Surgery Center (FL)                   |       | Delaware                                     |

 

----

 

**SUBSIDIARIESOF THE REGISTRANT (Continued)**

 
| **Name**                                              | ** ** | **Assumed  Name**                                                  | ** ** | **State of  Incorporation  or Organization** |
|-------------------------------------------------------|------------|--------------------------------------------------------------------|------------|----------------------------------------------|
| 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                                    |
| Physicians  Medical Center, L.L.C.                    |       | Physicians  Surgical Specialty Hospital (DE)**(Former Name)**      |       | Louisiana                                    |
| Physicians  Surgery Center, LLC                       |       | Lee  Island Coast Surgery Center (FL)                              |       | Delaware                                     |
| Physicians  Surgical Care Management, Inc.       |       |                                                               |       | Delaware                                     |
| Physicians  Surgical Care, Inc.                  |       |                                                               |       | Delaware                                     |
| Pickaway  Surgical Center, Ltd.                       |       | Physicians  Ambulatory Surgery Center (OH)                         |       | Ohio                                         |
| PMCROS,  L.L.C.                                       |       |                                                               |       | Louisiana                                    |
| Portsmouth,  LLC                                      |       |                                                               |       | Delaware                                     |
| Premier  Ambulatory Surgery of Duncanville, Inc. |       |                                                               |       | Delaware                                     |
| Premier  Orthopaedic Surgery Center, LLC              |       |                                                               |       | Tennessee                                    |
| PSC  Development Company, LLC                         |       |                                                               |       | Delaware                                     |
| PSC  of New York, L.L.C.                              |       |                                                               |       | Delaware                                     |
| PSC  Operating Company, LLC                           |       |                                                               |       | Delaware                                     |
| 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/Ft.  Myers, Inc.                            |       |                                                               |       | Tennessee                                    |
| SARC/FW, 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                                    |
| 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                                    |
| SMBI  Gresham, LLC                                    |       |                                                               |       | Tennessee                                    |
| SMBI  Havertown, LLC                                  |       |                                                               |       | Tennessee                                    |
| SMBI  Idaho, 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                                    |

 

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**SUBSIDIARIES OF THE REGISTRANT(Continued)**

 
| **Name**                                              | ** ** | **Assumed  Name**                                                                 | ** ** | **State of  Incorporation  or Organization** |
|-------------------------------------------------------|------------|-----------------------------------------------------------------------------------|------------|----------------------------------------------|
| 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                                   |
| Specialty  Surgical Center, LLC                       |       |                                                                              |       | California                                   |
| Surgery  Center of Duncanville, L.P.                  |       |                                                                              |       | Texas                                        |
| Surgery  Center of Hammond, LLC                       |       | St.  Luke’s Surgery Center (LA)                                              |       | Delaware                                     |
| Surgery  Center of Pennsylvania, LLC                  |       | Havertown                                                                         |       | Delaware                                     |
| Surgery  Center Partners, LLC                         |       | Timberlake  Surgery Center (MO)                                                   |       | Delaware                                     |
| Surgical  Hospital of Austin, L.P.                    |       | Austin  Surgical Hospital (TX)                                                    |       | Texas                                        |
| Surgicare  of Deland, Inc.                       |       |                                                                              |       | Florida                                      |
| Symbion  Ambulatory Resource Centres, Inc.       |       |                                                                              |       | Tennessee                                    |
| Symbion  Employee Relief Disaster Fund                |       |                                                                              |       | Tennessee                                    |
| Symbion  Imaging, Inc.                           |       |                                                                              |       | Tennessee                                    |
| 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            |       | UniPhy  Healthcare of Johnson City VI, Inc.**(Entity Conversion)**           |       | Tennessee                                    |
| UniPhy  Healthcare of Louisville, Inc.           |       |                                                                              |       | Tennessee                                    |
| UniPhy  Healthcare of Maine I, Inc.              |       |                                                                              |       | Tennessee                                    |
| UniPhy  Healthcare of Memphis I, LLC                  |       | UniPhy  Healthcare of Memphis I, Inc.**(Entity Conversion)**                 |       | Tennessee                                    |
| UniPhy  Healthcare of Memphis II, Inc.           |       |                                                                              |       | Tennessee                                    |
| UniPhy  Healthcare of Memphis III, LLC                |       |                                                                              |       | Tennessee                                    |
| UniPhy  Healthcare of Memphis IV, LLC                 |       |                                                                              |       | Tennessee                                    |
| Valley  Ambulatory Surgery Center, L.P.               |       |                                                                              |       | Illinois                                     |
| Valley  Medical Inn, L.P.                             |       |                                                                              |       | Illinois                                     |
| Valley  Sleep Centers, LLC                            |       |                                                                              |       | Illinois                                     |
| Valley  Surgical Center, Ltd.                         |       | Valley  Surgical Center                                                           |       | Ohio                                         |
| VASC, Inc.                                       |       |                                                                              |       | Illinois                                     |
| 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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