##### 



Exhibit 21.1
 NAME
    
    STATE OF INCORPORATION25 East Same Day Surgery, L.L.C.
    
    ILAdventist Midwest Health/USP Surgery Centers, L.L.C.
    
    ILAlamo Heights Surgicare, L.P.
    
    TXArlington Surgicare Partners, Ltd.
    
    TXAspen Healthcare Holdings, Ltd.
    
    UKAspen Healthcare, Ltd.
    
    UKAspen Leasing, Ltd.
    
    UKAustintown Surgery Center, LLC
    
    OHBaptist Plaza Surgicare, L.P.
    
    TNBaptist Surgery Center, L.P.
    
    TNBagley Holdings, LLC
    
    OHBellaire Outpatient Surgery Center, L.L.P.
    
    TXBon Secours Surgery Center at Virginia Beach, LLC
    
    VABriarcliff Ambulatory Surgery Center, L.P.
    
    MOCape Surgery Center, L.P.
    
    FLCedar Park Surgery Center, L.L.P.
    
    TXCentral Jersey Surgery Center, LLC
    
    GACentral Virginia Surgi-Center, L.P.
    
    VACHC/USP Surgery Centers, LLC
    
    FLChesterfield Ambulatory Surgery Center, L.P.
    
    MOChristus Cabrini Surgery Center, L.L.C.
    
    LAChristus Santa Rosa Surgery Center, L.L.P.
    
    TXChristus/USP General Partner, LLC
    
    TXChristus/USP Surgery Centers, L.P.
    
    TXCHW/USP Glendale GP, LLC
    
    CACHW/USP Glendale Memorial Surgery Centers, L.L.C.
    
    CACHW/USP Folsom GP, LLC
    
    CACHW/USP Las Vegas Surgery Centers, LLC
    
    NVCHW/USP Oxnard GP, LLC
    
    CACHW/USP Oxnard Surgery Centers, LLC
    
    CACHW/USP Phoenix II, LLC
    
    AZCHW/USP Roseville GP, LLC
    
    CACHW/USP Sacramento Surgery Centers, L.L.C.
    
    CACHW/USP San Gabriel GP, L.L.C.
    
    CACHW/USP San Gabriel Surgery Centers, L.L.C.
    
    CACHW/USP Surgery Centers, LLC
    
    AZClarkston ASC Partners, LLC
    
    MICoast Surgery Center, L.P.
    
    CACorpus Christi Holdings, LLC
    
    NVCorpus Christi Surgicare, Ltd.
    
    TXCreekwood Surgery Center, L.P.
    
    MO




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NAME
    
    STATE OF INCORPORATIONDallas Surgical Partners, L.L.P.
    
    TXDay-Op Surgery Consulting Company, LLC
    
    DEDecatur Surgery Center, L.P.
    
    DEDenton Surgicare Partners, Ltd.
    
    TXDenton Surgicare Real Estate, Ltd.
    
    TXDesert Ridge Outpatient Surgery, LLC
    
    AZDesoto Surgicare Partners, Ltd.
    
    TXDestin Surgery Center, Ltd.
    
    FLDoctors Outpatient Surgicenter, Ltd.
    
    TXEast Brunswick Surgery Center, LLC
    
    NJEast West Surgery Center, L.P.
    
    GAElmwood Park Same Day Surgery, L.L.C.
    
    ILENH/USP Surgery Centers II, L.L.C.
    
    ILFolsom Outpatient Surgery Center, L.P.
    
    CAFort Worth Osteopathic Surgery Center, L.P.
    
    TXFort Worth Osteopathic Surgery Center GP, L.L.C.
    
    TXFort Worth Surgicare Partners, Ltd.
    
    TXFrisco Medical Center, L.L.P.
    
    TXGarland Surgicare Partners, Ltd.
    
    TXGeorgia Musculoskeletal Network, Inc.
    
    GAGenesis ASC Partners, LLC
    
    MIGlendale Memorial Ambulatory Surgery Center, L.P.
    
    CAGlobal Healthcare Partners, Ltd.
    
    UKGrapevine Surgicare Partners, Ltd.
    
    TXGreater Baton Rouge Surgical Hospital, LLC
    
    LAHealth Horizons of Kansas City, Inc.
    
    TNHealth Horizons of Murfreesboro, Inc.
    
    TNHealth Horizons of Nashville, Inc.
    
    TNHighgate Private Clinic, Ltd.
    
    UKHuguley Surgery Center, LLP
    
    TXINTEGRIS/USP Surgery Centers, LLC
    
    OKINTEGRIS/USP Surgery Centers II, L.L.C.
    
    OKIrving-Coppell Surgical Hospital, L.L.P.
    
    TXKSF Orthopaedic Surgery Center, L.L.P.
    
    TXLake Lansing ASC Partners, LLC
    
    MILansing ASC Partners, LLC
    
    MILapeer ASC Partners, LLC
    
    MILas Cruces Surgical Center LLC
    
    NMLawrenceville Surgery Center, L.L.C.
    
    GALewisville Surgicare Partners, Ltd.
    
    TXLiberty Ambulatory Surgery Center, L.P.
    
    MOMary Immaculate Ambulatory Surgery Center, LLC
    
    VAMcLaren ASC of Flint, LLC
    
    MI




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NAME
    
    STATE OF INCORPORATIONMCSH Real Estate Investors, Ltd.
    
    TXMedcenter Management Services, Inc.
    
    DEMemorial Ambulatory Surgery Center, LLC
    
    VAMemorial Hermann Surgery Center Katy, LLP
    
    TXMemorial Hermann Surgery Center Northwest LLP
    
    TXMemorial Hermann Surgery Center Southwest, L.L.P.
    
    TXMemorial Hermann Surgery Center Texas Medical Center, LLP
    
    TXMemorial Hermann Surgery Center Sugar Land, L.L.P.
    
    TXMemorial Hermann Surgery Center  The Woodlands, LLP
    
    TXMemorial Hermann/USP Surgery Centers, LLP
    
    TXMemorial Hermann/USP Surgery Centers II, LP
    
    TXMemorial Hermann/USP Surgery Centers III, LLP
    
    TXMercy/USP General Partners, L.L.C.
    
    PAMercy/USP Surgery Centers, L.P.
    
    PAMetroplex Surgicare Partners, Ltd.
    
    TXMichigan ASC Partners, L.L.C.
    
    MIMid Rivers Ambulatory Surgery Center, L.P.
    
    MOMiddle Tennessee Ambulatory Surgery Center, L.P.
    
    DEMountain Empire Surgery Center, L.P.
    
    GAMSH Partners, LLP
    
    TXNew Mexico Orthopaedic Surgery Center Limited Partnership
    
    GANorth MacArthur Surgery Center, LLC
    
    OKNorth Central Surgical Center, L.L.P.
    
    TXNorth Garland Surgery Center, L.L.P.
    
    TXNKCH/USP Briarcliff GP, LLC
    
    MONKCH/USP Liberty GP, LLC
    
    MONorth Shore Same Day Surgery, L.L.C.
    
    ILNorthern Monmouth Regional Surgery Center, L.L.C.
    
    NJNorthside-Cherokee/USP Surgery Centers, L.L.C.
    
    GANorthwest Georgia Orthopaedic Surgery Center, LLC
    
    GAOklahoma Center for Orthopedic and Multi-Specialty Surgery, LLC
    
    OKOrtho Excel, Inc.
    
    DEOrthoLink ASC Corporation
    
    TNOrthoLink Baptist ASC, LLC
    
    TNOrthoLink Physicians Corporation
    
    DEOrthoLink Radiology Services Corporation
    
    TNOrthoLink/ Georgia ASC, Inc.
    
    GAOrthoLInk/New Mexico ASC, Inc.
    
    GAOrthoLink/TN ASC, Inc.
    
    TNOrthoLInk/TOC, LLC
    
    TNOlive Ambulatory Surgery Center, L.P.
    
    MOOrthopedic and Surgical Specialty Company, LLC
    
    AZOrthopedic South Surgical Partners, LLC
    
    GA




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NAME
    
    STATE OF INCORPORATIONPacific Endo-Surgical Center, L.P.
    
    CAPark Cities Surgery Center, L.P.
    
    TXParkway Surgery Center, LLC
    
    NVParkwest Surgery Center, L.P.
    
    TNPasadena Holdings, LLC
    
    NVPhysicians Data Professionals, Inc.
    
    TXPhysicians Pavilion, L.P.
    
    DEPlainfield Surgery Center, LLC
    
    ILProvidence/USP Santa Clarita GP, LLC
    
    CAProvidence/USP Surgery Centers, L.L.C.
    
    CARadsource, LLC
    
    DEReading Ambulatory Surgery Center, L.P.
    
    PAResurgens Surgery Center, LLC
    
    GARiver North Same Day Surgery, L.L.C.
    
    ILRockwall/Heath Surgery Center, L.L.P.
    
    TXRoseville Surgery Center, L.P.
    
    CARoswell Surgery Center, L.L.C.
    
    GASaint Thomas Campus Surgicare, L.P.
    
    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 Surgery, LLC
    
    ILSame Day Management, L.L.C.
    
    ILSan Antonio Endoscopy, L.P.
    
    TXSan Fernando Valley Surgery Center, L.P.
    
    CASan Gabriel Ambulatory Surgery Center, L.P.
    
    CASan Gabriel Valley Surgical Center, L.P.
    
    CASan Martin Surgery Center, LLC
    
    NVSanta Clarita Surgery Center, L.P.
    
    CASarasota Surgicare, Ltd.
    
    FLShrewsbury Surgery Center, LLC
    
    NJShore Outpatient Surgicenter, L.L.C.
    
    GASmartHealth Norwin Hills Outpatient Center, L.P.
    
    PASouthwest Ambulatory Surgery Center, L.L.C.
    
    OKSpecialists Surgery Center, L.L.C.
    
    OKSpecialty Surgicenters, Inc.
    
    GASSI Holdings, Inc.
    
    GASt. Agnes Surgery Center of Ellicott City, L.L.L.P.
    
    MDSt. Agnes/USP Joint Venture, LLC
    
    MDSt. Johns Outpatient Surgery Center, LP
    
    CASt. Josephs Outpatient Surgery Center, LLC
    
    AZSt. Marys Surgical Center, LLC
    
    MOSt. Marys/USP Surgery Centers, LLC
    
    MO




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NAME
    
    STATE OF INCORPORATIONSt. Vincent Health/USP, LLC
    
    INSugar Land Surgical Hospital, LLP
    
    TXSunset Hills Ambulatory Surgery Center, L.P.
    
    MOSurgery Center of Georgia, LLC
    
    GASurgicoe of Texas, Inc.
    
    TXSurgicoe Real Estate, L.L.C.
    
    GATamarac Surgery Center LLC
    
    FLTerre Haute Surgical Center, LLC
    
    INTeton Outpatient Services, LLC
    
    WYTexan Ambulatory Surgery Center, L.P.
    
    TXTexas Health Venture Arlington L.P.
    
    TXTexas Health Venture Bellaire, L.P.
    
    TXTexas Health Venture Denton L.P.
    
    TXTexas Health Venture DSP L.P.
    
    TXTexas Health Venture Fort Worth, L.L.C.Texas Health Venture Frisco, L.P.
    
    TXTexas Health Venture Garland, L.P.Texas Health Venture Grapevine L.P.
    
    TXTexas Health Venture Huguley, L.P.
    
    TXTexas Health Venture Irving-Coppell, L.P.
    
    TXTexas Health Venture North Garland, L.P.
    
    TXTexas Health Venture Park Cities, L.P.
    
    TXTexas Health Venture Park Cities/Trophy Club, LP
    
    TXTexas Health Venture Rockwall, L.P.
    
    TXTexas Health Ventures Group L.L.C.
    
    TXTexas Health Ventures Group Holdings, LLC
    
    NVThe Center for Ambulatory Surgical Treatment, L.P.
    
    CAThe Surgery Center, an Ohio limited partnership
    
    OHTHVG Arlington GP, LLC
    
    DETHVG Bedford GP, LLC
    
    DETHVG Bedford, L.P.
    
    TXTHVG Bellaire GP, LLC
    
    TXTHVG Denton GP, LLC
    
    DETHVG DeSoto GP, LLC
    
    DETHVG DeSoto, L.P.
    
    TXTHVG DSP GP, LLC
    
    DETHVG Fort Worth GP, LLC
    
    DETHVG Fort Worth, L.P.
    
    TXTHVG Frisco GP, LLC
    
    DETHVG Garland GP, LLC
    
    DETHVG Grapevine GP, LLC
    
    DETHVG Huguley GP, LLC
    
    DETHVG Irving-Coppell GP, LLC
    
    DE




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NAME
    
    STATE OF INCORPORATIONTHVG Lewisville GP, LLC
    
    DETHVG Lewisville, L.P.
    
    TXTHVG North Garland GP, LLC
    
    DETHVG Park Cities GP, LLC
    
    TXTHVG Park Cities/Trophy Club GP, LLC
    
    TXTHVG Rockwall GP, LLC
    
    DETHVG Valley View GP, LLC
    
    DETHVG Valley View L.P.
    
    TXTHVG/HeatlhFirst, LLC
    
    TXTHVG/HealthFirst Holdings, LLC
    
    NVToms River Surgery Center, L.L.C.
    
    NJTOPS Specialty Hospital, Ltd.
    
    TXTrophy Club Medical Center, L.P.
    
    TXTulsa Outpatient Surgery Center, LLC
    
    OKUnited Surgery Center  Southeast, Ltd.
    
    TXUnited Surgical Associates, L.L.C.
    
    AZUniversity Surgical Partners of Dallas, L.L.P.
    
    TXUnited Surgical of Atlanta, Inc.
    
    GAUnited Surgical Partners Holdings, Inc.
    
    DEUniversity Surgery Center, Ltd.
    
    FLUSP Alexandria, Inc.
    
    LAUSP Austin, Inc.
    
    TXUSP Austintown, Inc.
    
    OHUSP Baton Rouge, Inc.
    
    LAUSP Baltimore, Inc.
    
    MDUSP Cedar Park, Inc.
    
    TXUSP Central New Jersey, Inc.
    
    NJUSP Chesterfield, Inc.
    
    MOUSP Chicago, Inc.
    
    ILUSP Cleveland, Inc.
    
    OHUSP Coast, Inc.
    
    CAUSP Corpus Christi, Inc.
    
    TXUSP Cottonwood, Inc.
    
    AZUSP Creve Coeur, Inc.
    
    MOUSP Decatur, Inc.
    
    TNUSP Destin, Inc.
    
    FLUSP Domestic Holdings, Inc.
    
    DEUSP Fredericksburg, Inc.
    
    VAUSP Glendale, Inc.
    
    CAUSP Houston, Inc.
    
    TXUSP Indiana, Inc.
    
    INUSP International Holdings, Inc.
    
    DEUSP Kansas City, Inc.
    
    MO




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NAME
    
    STATE OF INCORPORATIONUSP Las Cruses, Inc.
    
    NMUSP Long Island, Inc.
    
    DEUSP Lyndhurst, Inc.
    
    OHUSP Michigan, Inc.
    
    MIUSP Midwest, Inc.
    
    ILUSP Mission Hills, Inc.
    
    CAUSP Nevada, Inc.
    
    NVUSP Nevada Holdings, LLC
    
    NVUSP Newport News, Inc.
    
    VAUSP New Jersey, Inc.
    
    NJUSP North Kansas City, Inc.
    
    MOUSP North Texas, Inc.
    
    DEUSP Oklahoma, Inc.
    
    OKUSP Olive, Inc.
    
    MOUSP Oxnard, Inc.
    
    CAUSP Philadelphia, Inc.
    
    PAUSP Phoenix, Inc.
    
    AZUSP Pittsburgh, Inc.
    
    PAUSP Reading, Inc.
    
    PAUSP Richmond, Inc.
    
    VAUSP Sacramento, Inc.
    
    CAUSP San Antonio, Inc.
    
    TXUSP San Gabriel, Inc.
    
    CAUSP Sarasota, Inc.
    
    FLUSP Securities Corporation
    
    TNUSP St. Peters, Inc.
    
    MOUSP Sunset Hills, Inc.
    
    MOUSP Tennessee, Inc.
    
    TNUSP Texas, L.P.
    
    TXUSP Texas Air, L.L.C.
    
    TXUSP Torrance, Inc.
    
    CAUSP Virginia Beach, Inc.
    
    VAUSP West Covina, Inc.
    
    CAUSP Westwood, Inc.
    
    CAUSP Winter Park, Inc.
    
    FLUSPE Holdings Limited
    
    UKValley View Surgicare Partners, Ltd.
    
    TXWarner Park Surgery Center, L.P.
    
    AZZeeba Surgery Center, L.P.
    
    OH