Exhibit 21.1
  STATE OFNAME
    
    INCORPORATION25 East Same Day Surgery, L.L.C.
    
    ILAdvanced Ambulatory Surgical Care, L.P. (doing business as Advanced Surgical Care)
    
    MOAdventist Midwest Health/USP Surgery Centers, L.L.C.
    
    ILAlamo Heights Surgicare, L.P. (doing business as Alamo Heights Surgery Center)
    
    TXAlliance Greenville, L.P.
    
    DEAlliance Greenville Texas General Partner, LLC
    
    DEAlliance Sterling Ridge, L.P.
    
    DEAlliance Surgery Augusta, LLC
    
    DEAlliance Surgery Buloxi, L.L.C.
    
    DEAlliance Surgery Birmingham, LLC
    
    DEAlliance Surgery, Inc.
    
    DEAlliance Texas Limited Partners, LLC
    
    DEAlexandria Surgery Center Real Estate, LLC
    
    LAAmbulatory Surgical Associates, LLC
    
    TNArlington Orthopedic and Spine Hospital, LLC (doing business as Baylor Orthopedic and Spine
Hospital at Arlington)
    
    TXArlington Surgicare Partners, Ltd. (doing business as Baylor Surgicare at Arlington)
    
    TXAspen Healthcare Holdings, Ltd.
    
    UKAspen Healthcare, Ltd.
    
    UKAspen Leasing, Ltd.
    
    UKBagley Holdings, LLC
    
    OHBallenger Crow Development, LLC
    
    DEBaptist Plaza Surgicare, L.P.
    
    TNBaptist Surgery Center, L.P. (doing business as Baptist Ambulatory Surgery Center)
    
    TNBaptist Womens Health Center, LLC (doing business as The Center for Spinal Surgery)
    
    TNBaptist/USP Beaumont, LLC
    
    TXBaptist/USP Surgery Centers, L.L.C.
    
    TXBaylor Surgicare at Duncanville, LLC
    
    TXBaylor Surgicare at Ennis, LLC
    
    TXBaylor Surgicare at Granbury, LLC
    
    TXBaylor Surgicare at Mansfield, LLC
    
    TXBaylor Surgicare at Plano, LLC
    
    TXBeaumont Surgical Affiliates, Ltd. (dba Baptist Beaumont Surgical Affiliates)
    
    TXBellaire Outpatient Surgery Center, L.L.P. (doing business as Baylor Surgicare at Oakmont)
    
    TXBon Secours Surgery Center at Harbour View, LLC
    
    VABon Secours Surgery Center at Virginia Beach, LLC
    
    VABremner Duke/Mary Shiels Development, L.P.
    
    INBriarcliff Ambulatory Surgery Center, L.P. (doing business as Briarcliff Surgery Center)
    
    MOCedar Park Surgery Center, L.L.P. (dba Hill Country Surgery Center)
    
    TXCentral Jersey Surgery Center, LLC
    
    GACentral Virginia Surgi-Center, L.P. (doing business as Surgi-Center of Central Virginia)
    
    VAChesterfield Ambulatory Surgery Center, L.P. (doing business as Chesterfield Surgery Center)
    
    MOChico Surgery Center, LP
    
    CACHRISTUS Cabrini Surgery Center, L.L.C.
    
    LACHRISTUS Santa Rosa Imaging Centers Partnership, LLC
    
    TXChristus/USP General Partner, LLC
    
    TXChristus/USP Surgery Centers, L.P.
    
    TXCHW/USP Folsom GP, LLC
    
    CACHW/USP Grass Valley GP, LLC
    
    CACHW/USP Las Vegas Surgery Centers, LLC
    
    NVCHW/USP Metro Surgery Center, LLC
    
    AZCHW/USP Phoenix Surgery Centers, LLC
    
    AZCHW/USP Phoenix II, LLC
    
    AZCHW/USP Redding GP, LLC
    
    CACHW/USP Roseville GP, LLC
    
    CACHW/USP Sacramento Surgery Centers, L.L.C.
    
    CAClarkston ASC Partners, LLC (doing business as Clarkston Surgery Center)
    
    MICoast Surgery Center, L.P. (doing business as Coast Surgery Center of South Bay)
    
    CACorpus Christi Surgicare, Ltd. (doing business as CHRISTUS Spohn  Corpus Christi Outpatient Surgery)
    
    TXCreekwood Surgery Center, L.P.
    
    MOCrown Point Surgery Center, LLC
    
    COCSR/USP Surgery Centers, LLC
    
    TXCS/USP General Partners, LLC
    
    TXCS/USP Surgery Centers, LP
    
    TXDallas Surgical Partners, LLC (doing business as (1) Baylor Surgicare (2) Texas Surgery Center
and (3) Physicians Day Surgery
    
    TXDay-Op Surgery Consulting Company, LLC
    
    DEDenton Surgicare Partners, Ltd. (doing business as Baylor Surgicare at Denton)
    
    TXDenton Surgicare Real Estate, Ltd.
    
    TXDesert Ridge Outpatient Surgery, LLC (doing business as Desert Ridge Outpatient Surgery Center)
    
    AZDesoto Surgicare Partners, Ltd. (doing business as North Texas Surgery Center)
    
    TXDestin Surgery Center, LLC
    
    FLDoctors Outpatient Surgicenter, Ltd.
    
    TXEast Portland Surgery Center, LLC
    
    OREast West Surgery Center, L.P.
    
    GAEastgate Building Center, L.L.C.
    
    OHElmwood Park Same Day Surgery, L.L.C.
    
    ILEye Surgery Center of Nashville, LLC
    
    TNFlatirons Surgery Center, LLC
    
    COFolsom Outpatient Surgery Center, L.P. (doing business as Folsom Surgery Center)
    
    CAFort Worth Surgicare Partners, Ltd. (doing business as Baylor Surgical Hospital at Ft. Worth)
    
    TXFranklin Endoscopy Center, LLC
    
    TNFrisco Medical Center, L.L.P. (doing business as Baylor Medical Center at Frisco)
    
    TXFrontenac Ambulatory Surgery & Spine Care Center, L.P. (doing business as Frontenac Surgery &
Spine Care Center)
    
    MOGallatin Physician Realty Partners, LLC
    
    TNGarland Surgicare Partners, Ltd. (doing business as Baylor Surgicare at Garland)
    
    TXGateway Endoscopy Center, L.P.
    
    MO




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##### 



STATE OFNAME
    
    INCORPORATIONGenesis ASC Partners, LLC (doing business as Genesis Surgery Center)
    
    MIGeorgia Musculoskeletal Network, Inc.
    
    GAGlobal Healthcare Partners, Ltd.
    
    UKGP Surgery Center, LLC (doing business as Great Plains Ambulatory Surgery Center)
    
    DEGrapevine Surgicare Partners, Ltd. (doing business as Baylor Surgicare at Grapevine)
    
    TXGrass Valley Outpatient Surgery Center, L.P. (doing business as Grass Valley Surgery Center)
    
    CAGreenville Physicians Surgery Center, LLP
    
    TXHarvard Park Surgery Center, LLC
    
    COHealth Horizons of Kansas City, Inc.
    
    TNHealth Horizons of Murfreesboro, Inc.
    
    TNHighgate Private Clinic, Ltd.
    
    UKHealthMark Partners, Inc.
    
    DEHealthMark Partners of Maryland, Inc.
    
    MDHinsdale Surgical Center, LLC
    
    ILHMHP/USP Surgery Centers, LLC
    
    OHHope Square Surgical Center, LLC
    
    DEHouston Ambulatory Surgical Associates, L.P.
    
    TXHuguley Surgery Center, LLP (doing business as Doctors Surgery Center at Huguley)
    
    TXICNU Rockford, LLC
    
    ILICNU San Antonio, LLC
    
    TXImplant Solutions, LLC
    
    TNINTEGRIS/USP Surgery Centers, LLC
    
    OKINTEGRIS/USP Surgery Centers II, L.L.C.
    
    OKIdaho Surgery Center, LLC
    
    IDIrving-Coppell Surgical Hospital, L.L.P.
    
    TXISS-Orlando, LLC
    
    FLKHS Ambulatory Surgery Center LLC (doing business as Select Surgical Center at Kennedy)
    
    NJKHS/USP Surgery Centers, LLC
    
    NJKSF Orthopaedic Surgery Center, L.L.P.
    
    TXLake Lansing ASC Partners, LLC (doing business as Lansing Surgery Center)
    
    MILansing ASC Partners, LLC
    
    MILas Cruces Surgical Center LLC
    
    NMLawrenceville Surgery Center, L.L.C.
    
    GALebanon Endoscopy Center, LLC
    
    TNLegacy/USP Surgery Centers, L.L.C.
    
    ORLewisville Surgicare Partners, Ltd. (doing business as Baylor Surgicare at Lewisville)
    
    TXLiberty Ambulatory Surgery Center, L.P.
    
    MOLiberty Ambulatory Surgery Center, LLC
    
    NJLiberty/USP Surgery Centers, L.L.C.
    
    NJLone Star Endoscopy Center, LLC (doing business as Lone Star Endoscopy)
    
    TXManchester Ambulatory Surgery Center, LP (doing business as Manchester Surgery Center)
    
    MOMary Immaculate Ambulatory Surgery Center, LLC
    
    VAMason Ridge Ambulatory Surgery Center, L.P. (doing business as Mason Ridge Surgery Center)
    
    MOMcLaren ASC of Flint, LLC (doing business as Mid-Michigan Surgery & Endoscopy Center)
    
    MIMcLaren Real Estate Partners, Limited Partnership
    
    MIMCSH Real Estate Investors, Ltd.
    
    TXMedcenter Management Services, Inc.
    
    DEMedical Park Tower Surgery Center, LLC
    
    TXMedPlex Outpatient Surgery Center, Ltd.
    
    ALMemorial Ambulatory Surgery Center, LLC
    
    VAMemorial Hermann Endoscopy Center North Freeway, LLC
    
    TXMemorial Hermann Endoscopy & Surgery Center North Houston, LLC
    
    TXMemorial Hermann Specialty Hospital Kingwood, L.L.C.
(doing business as Memorial Hermann Surgical Hospital Kingwood)
    
    TXMemorial Hermann Surgery Center Katy, LLP
    
    TXMemorial Hermann Surgery Center Kingsland, LLP
    
    TXMemorial Hermann Surgery Center Memorial City, LLC
(doing business as Memorial Hermann Surgery Center Memorial Village)
    
    TXMemorial Hermann Surgery Center Northwest LLP
    
    TXMemorial Hermann Surgery Center Pearland, LLC
    
    TXMemorial Hermann Surgery Center Richmond, LLC
    
    TXMemorial Hermann Surgery Center Southwest, L.L.P.
    
    TXMemorial Hermann Surgery Center Sugar Land, L.L.P.
    
    TXMemorial Hermann Surgery Center Texas Medical Center, LLP
    
    TXMemorial Hermann Surgery Center  The Woodlands, LLP
    
    TXMemorial Hermann Surgery Center Woodlands Parkway, LLC
    
    TXMemorial Hermann/USP Surgery Centers, LLP
    
    TXMemorial Hermann/USP Surgery Centers II, LP
    
    TXMemorial Hermann/USP Surgery Centers III, LLP
    
    TXMemorial Hermann/USP Surgery Centers IV, LLP
    
    TXMemorial Surgery Center, LLC
    
    OKMetro Surgery Center, L.P.
    
    DEMetrocrest Surgery Center, L.P. (doing business as Baylor Surgicare at Carrollton)
    
    TXMetroplex Surgicare Partners, Ltd. (doing business as Baylor Surgicare at Bedford)
    
    TXMH Memorial City Surgery, LLC
    
    TXMH/USP Kingsland, LLC
    
    TXMH/USP Kingwood, LLC
    
    TXMH/USP North Freeway, LLC
    
    TXMH/USP North Houston, LLC
    
    TXMH/USP Northwest GP, LLC
    
    TXMH/USP Richmond, LLC
    
    TXMH/USP West Houston, L.L.C.
    
    TXMH/USP Woodlands Parkway, LLC
    
    TXMichigan ASC Partners, L.L.C.
    
    MIMid Rivers Ambulatory Surgery Center, L.P. (doing business as Mid Rivers Surgery Center)
    
    MOMid-State Endoscopy Center, LLC
    
    TNMiddle Tennessee Ambulatory Surgery Center, L.P.
    
    DEMidwest Digestive Health Center, LLC (doing business as Midwest Physicians Surgery Center)
    
    MOMountain Empire Surgery Center, L.P.
    
    GAMSH Partners, LLC (doing business as Baylor Medical Center at Uptown)
    
    TX




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##### 



STATE OFNAME
    
    INCORPORATIONNew Horizons Surgery Center, LLC
    
    OHNew Mexico Orthopaedic Surgery Center Limited Partnership
    
    GANKCH/USP Briarcliff GP, LLC
    
    MONKCH/USP Liberty GP, LLC
    
    MONKCH/USP Surgery Centers, LLC
    
    MONKCH/USP Surgery Centers II, L.L.C.
    
    MONorth Central Surgical Center, L.L.P.
    
    TXNorth Garland Surgery Center, L.L.P. (doing business as Baylor Surgicare at North Garland)
    
    TXNorth Shore Same Day Surgery, L.L.C. (doing business as North Shore Surgical Center)
    
    ILNorthShore/USP Surgery Centers II, L.L.C.
    
    ILNorth State Surgery Centers, L.P. (doing business as (1) Court Street Surgery Center (2) Mercy Surgery
Center
and (3) Redding Surgery Center
    
    CANortheast Ohio Surgery Center, LLC
    
    OHNorthern Monmouth Regional Surgery Center, L.L.C.
    
    NJNorthridge Surgery Center, L.P.
    
    TNNorthwest Ambulatory Surgery Center, LLC
    
    ORNorthwest Georgia Orthopaedic Surgery Center, LLC (doing business as Northwest Georgia Surgery Center)
    
    GANorthwest Surgery Center, Ltd.
    
    TXNorthwest Surgery Center, LLP (doing business as Memorial Hermann Surgery Center Red Oak)
    
    TXOklahoma Center for Orthopedic and Multi-Specialty Surgery, LLC
    
    OKOld Tesson Surgery Center, L.P.
    
    MOOlive Ambulatory Surgery Center, L.P. (doing business as Olive Surgery Center)
    
    MOOrthoLink ASC Corporation
    
    TNOrthoLink Physicians Corporation
    
    DEOrthoLink Radiology Services Corporation
    
    TNOrthoLink/Baptist ASC, LLC
    
    TNOrthoLink/ Georgia ASC, Inc.
    
    GAOrthoLink/New Mexico ASC, Inc.
    
    GAOrthoLink/TN ASC, Inc.
    
    TNOrthopedic and Surgical Specialty Company, LLC (doing business as Arizona Orthpedic Surgical Hospital)
    
    AZOrthopedic South Surgical Partners, LLC (doing business as Orthopedic South Surgical Center)
    
    GAPacific Endo-Surgical Center, L.P.
    
    CAPAHS/USP Surgery Centers, LLC
    
    COPark Cities Surgery Center, L.P.
    
    TXParkway Surgery Center, LLC
    
    NVParkwest Surgery Center, L.P.
    
    TNPasadena Holdings, LLC
    
    NVPatient Partners, LLC (doing business as Patient Partners Surgery Center)
    
    TNPearland Ambulatory Surgery Center, Ltd.
    
    TNPendragon Development, LLC
    
    ILPhysicians Data Professionals, Inc.
    
    TXPhysicians Pavilion, L.P. (doing business as Physicians Pavilion Surgery Center)
    
    DEPhysicians Surgery Center at Good Samaritan, LLC
    
    ILPhysicians Surgery Center of Chattanooga, L.L.C.
    
    TNPhysicians Surgery Center of Knoxville, LLC
    
    TNPhysicians Surgical Center of Ft. Worth, LLP (doing business as (1) Physicians Surgical Center of Ft. Worth
and (2) Physicians Surgical Center of Ft. Worth II)
    
    TXProvidence/USP Santa Clarita GP, LLC
    
    CAProvidence/USP Surgery Centers, L.L.C.
    
    CARadsource, LLC
    
    DEReading Ambulatory Surgery Center, L.P. (doing business as Reading Surgery Center)
    
    PAReading Endoscopy Center, LLC
    
    DERedmond Surgery Center, LLC
    
    TNResurgens Surgery Center, LLC
    
    GARichmond ASC Leasing Company, LLC
    
    VARiver North Same Day Surgery, L.L.C.
    
    ILRiverside Ambulatory Surgery Center, L.P. (doing business as Riverside Surgery Center)
    
    MORockwall Ambulatory Surgery Center, L.L.P. (doing business as Baylor Surgicare at Rockwall)
    
    TXRockwall/Heath Surgery Center, L.L.P. (doing business as Baylor Surgicare at Heath)
    
    TXRoseville Surgery Center, L.P.
    
    CARoswell Surgery Center, L.L.C.
    
    GASaint Thomas Campus Surgicare, L.P. (doing business as Saint Thomas Surgicare)
    
    TNSaint Thomas/USP  Baptist Plaza, L.L.C.
    
    TNSaint Thomas/USP Surgery Centers, L.L.C.
    
    TNSaint Thomas/USP Surgery Centers II, LLC
    
    TNSame Day Management, L.L.C.
    
    ILSame Day Surgery, LLC
    
    ILSan Antonio Endoscopy, L.P. (doing business as San Antonio Endoscopy Center)
    
    TXSan Fernando Valley Surgery Center, L.P. (doing business as Providence Holy Cross Surgery Center
at Mission Hills)
    
    CASan Gabriel Valley Surgical Center, L.P.
    
    CASan Martin Surgery Center, LLC (doing business as Durango Outpatient Surgery Center)
    
    NVSand Lake Surgery Center, L.P.
    
    DESanta Clarita Surgery Center, L.P. (doing business as Summit Surgery Center)
    
    CAScripps Encinitas Surgery Center, LLC
    
    CAScripps/USP Surgery Centers, L.L.C.
    
    CAShore Outpatient Surgicenter, L.L.C.
    
    GAShoreline Real Estate Partnership, LLP
    
    TXShoreline Surgery Center, LLP (doing business as CHRISTUS Spohn  Surgicare of Corpus Christi)
    
    TXShrewsbury Surgery Center, LLC
    
    NJSouth County Outpatient Endoscopy Services, L.P.
    
    MOSouthwest Ambulatory Surgery Center, L.L.C. (doing business as Southwest Orthopedic Ambulatory
Surgery Center)
    
    OKSouthwest Orthopedic and Spine Hospital, LLC (doing business as OASIS Hospital)
    
    AZSouthwest Orthopedic and Spine Hospital Real Estate, LLC
    
    AZSpecialty Surgicenters, Inc.
    
    GASSI Holdings, Inc.
    
    GASSM St. Clare Surgical Center, L.L.C.
    
    MOSt. Agnes/USP Joint Venture, LLC
    
    MDSt. Josephs Outpatient Surgery Center, LLC
    
    AZ




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##### 



STATE OFNAME
    
    INCORPORATIONSt. Josephs Surgery Center, L.P.
    
    CASt. Louis Surgical Center, L.C.
    
    MOSt. Marys Ambulatory Surgery Center, LLC
    
    VASt. Marys Surgical Center, LLC
    
    MOSt. Marys/USP Surgery Centers, LLC
    
    MOSt. Vincent Health/USP, LLC
    
    INSuburban Endoscopy Services, LLC
    
    TNSugar Land Surgical Hospital, LLP (doing business as Surgical Specialty Hospital of Sugar Land LLP,
an affiliate of Memorial Hermann)
    
    TXSummit Radiology, LLC
    
    ILSummit View Surgery Center, LLC
    
    COSunset Hills Ambulatory Surgery Center, L.P. (doing business as Sunset Hills Surgery Center)
    
    MOSurgery Center of Canfield, LLC
    
    OHSurgery Center of Columbia, L.P.
    
    MOSurgery Center of Gilbert, LLC
    
    AZSurgery Center of Peoria, LLC
    
    OKSurgery Center of Scottsdale, LLC
    
    OKSurgery Center of Tempe, LLC (doing business as Physicians Surgery Center of Tempe)
    
    OKSurgery Centers Holdings Company, L.L.C.
    
    OKSurgery Centers of America II, LLC
    
    OKSurgical Health Partners, LLC
    
    TNSurgicenter of Baltimore, LLP
    
    MDSurgicoe of Texas, Inc.
    
    TXSurginet, Inc.
    
    TNSurgis, Inc.
    
    DESurgis Management Services, Inc.
    
    TNSurgis of Chico, Inc.
    
    CASurgis of Phoenix, Inc.
    
    TNSurgis of Redding, Inc.
    
    TNSurgis of Sand Lake, Inc.
    
    TNSurgis of Victoria, Inc.
    
    TNTamarac Surgery Center LLC (doing business as Surgery Center of Ft. Lauderdale)
    
    FLTCH/USP Mayfield, LLC
    
    OHTCH/USP Surgery Centers, LLC
    
    OHTempleton Surgery Center, LLC
    
    TNTENN SM, LLC (doing business as Tennessee Sports Medicine Surgery Center)
    
    TNTerre Haute Surgical Center, LLC (doing business as St. Vincent Surgery Center of Terre Haute)
    
    INTeton Outpatient Services, LLC
    
    WYTexan Ambulatory Surgery Center, L.P. (doing business as Texan Surgery Center)
    
    TXTexas Health Venture Arlington Hospital, LLC
    
    TXTexas Health Venture Carrollton, LLC
    
    TXTexas Health Venture Duncanville, LLC
    
    TXTexas Health Venture Ennis, LLC
    
    TXTexas Health Venture Fort Worth, L.L.C.
    
    TXTexas Health Venture Granbury, LLC
    
    TXTexas Health Venture Huguley, L.P.
    
    TXTexas Health Venture Keller, LLC
    
    TXTexas Health Venture Las Colinas, LLC
    
    TXTexas Health Venture Mansfield, LLC
    
    TXTexas Health Venture McKinney, LLC
    
    TXTexas Health Venture Park Cities, L.P.
    
    TXTexas Health Venture Plano, LLC
    
    TXTexas Health Venture Plano Parkway, LLC
    
    TXTexas Health Ventures Group L.L.C.
    
    TXThe Ambulatory Surgical Center of St. Louis, L.P.
    
    MOThe Center for Ambulatory Surgical Treatment, L.P.
    
    CAThe Christ Hospital Spine Surgery Center, LLC
    
    OHThe Surgery Center at Tri-City Orthopaedic Clinic, LLC
    
    WAThe Surgery Center at Williamson, LLC (doing business as Williamson Surgery Center)
    
    TXTHVG Arlington GP, LLC
    
    DETHVG Bedford GP, LLC
    
    DETHVG Bellaire GP, LLC
    
    TXTHVG Denton GP, LLC
    
    DETHVG DeSoto GP, LLC
    
    DETHVG DSP GP, LLC
    
    DETHVG Fort Worth GP, LLC
    
    DETHVG Frisco GP, LLC
    
    DETHVG Garland GP, LLC
    
    DETHVG Grapevine GP, LLC
    
    DETHVG Huguley GP, LLC
    
    DETHVG Irving-Coppell GP, LLC
    
    DETHVG Lewisville GP, LLC
    
    DETHVG North Garland GP, LLC
    
    DETHVG Park Cities GP, LLC
    
    TXTHVG Park Cities/Trophy Club GP, LLC
    
    TXTHVG Rockwall GP, LLC
    
    DETHVG Rockwall 2 GP, LLC
    
    TXTHVG Valley View GP, LLC
    
    DETMC Holding Company, LLC
    
    TXToms River Surgery Center, L.L.C.
    
    NJTOPS Specialty Hospital, Ltd. (doing business as TOPS Surgical Specialty Hospital)
    
    TXTwin Cities Ambulatory Surgery Center, LP (doing business as Twin Cities Surgery Center)
    
    MOTrophy Club Medical Center, L.P. (dba Baylor Medical Center at Trophy Club)
    
    TXTulsa Outpatient Surgery Center, LLC
    
    OKTuscan Surgery Center at Las Colinas, LLC
    
    TXUnited Surgery Center  Southeast, Ltd.
    
    TXUnited Surgical Partners Holdings, Inc.
    
    DEUniversity Surgery Center, Ltd. (dba University Surgical Center)
    
    FLUniversity Surgical Partners of Dallas, L.L.P.
    
    TXUpper Cumberland Physicians Surgery Center, LLC
    
    TN




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##### 



STATE OFNAME
    
    INCORPORATIONUSP Alexandria, Inc.
    
    LAUSP Assurance Company
    
    VTUSP Austin, Inc.
    
    TXUSP Austintown, Inc.
    
    OHUSP Baltimore, Inc.
    
    MDUSP Baton Rouge, Inc.
    
    LAUSP Beaumont, Inc.
    
    TXUSP Birmingham, Inc.
    
    ALUSP Bridgeton, Inc.
    
    MOUSP Cedar Park, Inc.
    
    TXUSP Chesterfield, Inc.
    
    MOUSP Chicago, Inc.
    
    ILUSP Cincinnatti, Inc.
    
    OHUSP Coast, Inc.
    
    CAUSP Columbia, Inc.
    
    MOUSP Corpus Christi, Inc.
    
    TXUSP Creve Coeur, Inc.
    
    MOUSP Denver, Inc.
    
    COUSP Des Peres, Inc.
    
    MOUSP Destin, Inc.
    
    FLUSP Domestic Holdings, Inc.
    
    DEUSP Fenton, Inc.
    
    MOUSP Festus, Inc.
    
    MOUSP Florissant, Inc.
    
    MOUSP Fredericksburg, Inc.
    
    VAUSP Frontenac, Inc.
    
    MOUSP Gateway, Inc.
    
    MOUSP Glendale, Inc.
    
    CAUSP Harbour View, Inc.
    
    VAUSP Houston, Inc.
    
    TXUSP Indiana, Inc.
    
    INUSP International Holdings, Inc.
    
    DEUSP Jersey City, Inc.
    
    NJUSP Kansas City, Inc.
    
    MOUSP Knoxville, Inc.
    
    TNUSP Las Cruses, Inc.
    
    NMUSP Long Island, Inc.
    
    DEUSP Mason Ridge, Inc.
    
    MOUSP Mattis, Inc.
    
    MOUSP Michigan, Inc.
    
    MIUSP Midwest, Inc.
    
    ILUSP Mission Hills, Inc.
    
    CAUSP Mt. Vernon, Inc.
    
    ILUSP Nevada, Inc.
    
    NVUSP Nevada Holdings, LLC
    
    NVUSP New Jersey, Inc.
    
    NJUSP Newport News, Inc.
    
    VAUSP North Kansas City, Inc.
    
    MOUSP North Texas, Inc.
    
    DEUSP Office Parkway, Inc.
    
    MOUSP Oklahoma, Inc.
    
    OKUSP Olive, Inc.
    
    MOUSP Oxnard, Inc.
    
    CAUSP Phoenix, Inc.
    
    AZUSP Portland, Inc.
    
    ORUSP Reading, Inc.
    
    PAUSP Richmond, Inc.
    
    VAUSP Richmond II, Inc.
    
    VAUSP Rockwall, Inc.
    
    TXUSP Sacramento, Inc.
    
    CAUSP San Antonio, Inc.
    
    TXUSP San Gabriel, Inc.
    
    CAUSP Securities Corporation
    
    TNUSP St. Louis, Inc.
    
    MoUSP St. Peters, Inc.
    
    MOUSP Sunset Hills, Inc.
    
    MOUSP Tennessee, Inc.
    
    TNUSP Texas, L.P.
    
    TXUSP Texas Air, L.L.C.
    
    TXUSP Torrance, Inc.
    
    CAUSP Turnersville, Inc.
    
    NJUSP Virginia Beach, Inc.
    
    VAUSP Webster Groves, Inc.
    
    MOUSP West Covina, Inc.
    
    CAUSP Westwood, Inc.
    
    CAUSP Winter Park, Inc.
    
    FLUSPE Holdings Limited
    
    UKUSPI San Diego, Inc.
    
    CAUSPI Stockton, Inc.
    
    CAUtica ASC Partners, LLC (doing business as Utica Surgery Cetner)
    
    MIUtica/USP Tulsa, L.L.C.
    
    OKValley View Surgicare Partners, Ltd. (doing business as Baylor Surgicare at Valley View)
    
    TXVeroscan, Inc.
    
    DEVictoria Ambulatory Surgery Center, LP (doing business as The Surgery Center)
    
    DEWarner Park Surgery Center, LP
    
    AZWebster Ambulatory Surgery Center, L.P. (doing business as Webster Surgery Center)
    
    MOWest Houston Ambulatory Surgical Associates, L.P. (doing business as West Houston Surgicare)
    
    TXWHASA, LC
    
    TXWilliamson Surgery Center, LLC
    
    TN