Exhibit 21

Exhibit 21. Subsidiaries of Registrant

ASC Property Management, Inc.
Incorporated State:	Louisiana
ASC of Aiken, Inc.
Incorporated State:	Delaware
ASC of Brownsville, Inc.
Incorporated State:	Delaware
ASC of Corona, Inc.
Incorporated State:	California
ASC of East New Orleans, Inc.
Incorporated State:	Delaware
ASC of Las Vegas, Inc.
Incorporated State:	Nevada
ASC of Louisiana, Inc.
Incorporated State:	Louisiana
ASC of Midwest City, Inc.
Incorporated State:	Oklahoma
ASC of Palm Springs, Inc.
Incorporated State:	California
ASC of Puerto Rico, Inc.
Incorporated State:	Delaware
ASC of Reno, Inc.
Incorporated State:	Nevada
ASC of St. George, Inc.
Incorporated State:	Utah
ASC of Wellington, Inc.
Incorporated State:	Florida
Aiken Regional Medical Centers, Inc.
Incorporated State:	South Carolina
Aiken Regional Receivables, L.L.C
Incorporated State:	Delaware
Alabama Clinical Schools, Inc.
Incorporated State:	Alabama

Alicante School Elk Grove, LLC
Incorporated State:	California
Ambulatory Surgery Center of Brownsville, L.P.
Incorporated State:	Delaware
Ambulatory Surgery Center of Temecula Valley, Inc.
Incorporated State:	California
Ambulatory Surgical Center of Aiken, L.L.C.
Incorporated State:	South Carolina
Arbour Elder Services, Inc.
Incorporated State:	Massachusetts
Arbour Health Systems Foundation, Inc.
Incorporated State:	Massachusetts
Arkansas Surgery Center of Fayetteville, Limited Partnership
Incorporated State:	Arkansas
Associated Child Care Educational Services, Inc.
Incorporated State:	California
Auburn Regional Medical Center, Inc.
Incorporated State:	Washington
Auburn Regional Receivables, L.L.C
Incorporated State:	Delaware
Behavioral Healthcare Alliance, LLC
Incorporated State:	Kentucky
Bowling Green Radiation Therapy Associates, L.L.P.
Incorporated State:	Kentucky
CCS/Bay County, Inc.
Incorporated State:	Florida
CCS/Lansing, Inc.
Incorporated State:	Michigan
CCS/Little Rock, Inc.
Incorporated State:	Arkansas
CCS/Meadow Pines, Inc.
Incorporated State:	Texas
CCS/Rivendell of Kentucky, Inc.
Incorporated State:	Kentucky
Capitol Radiation Therapy, L.L.P.
Incorporated State:	Kentucky

Casa de Lago, L.L.C.
Incorporated State:	Delaware
Central Montgomery Medical Center, L.L.C.
Incorporated State:	Pennsylvania
Central Montgomery Receivables, L.L.C.
Incorporated State:	Delaware
Chad Youth Enhancement Center, Inc.
Incorporated State:	Tennessee
Chalmette Medical Center, Inc.
Incorporated State:	Louisiana
Children’s Comprehensive Services, Inc.
Incorporated State:	Tennessee
Choate Health Management, Inc.
Incorporated State:	Massachusetts
Community Behavioral Health, L.L.C.
Incorporated State:	Delaware
Comprehensive Occupational and Clinical Health, Inc.
Incorporated State:	Florida
Contemporary Physician Services, Inc.
Incorporated State:	Texas
Del Amo Hospital, Inc.
Incorporated State:	California
District Hospital Partners Receivables, L.L.C
Incorporated State:	Delaware
District Hospital Partners, L.P.
Incorporated State:	District of Columbia
Doctors’ Hospital of Shreveport, Inc.
Incorporated State:	Louisiana
Edinburg Ambulatory Surgical Center, Inc.
Incorporated State:	Texas
Edinburg Holdings, Inc.
Incorporated State:	Delaware
Edinburg Surgery Center, L.P.
Incorporated State:	Delaware
Elmira NPS, LLC
Incorporated State:	California

Eye Surgery Specialists of Puerto Rico, L.L.C.
Incorporated State:	Delaware
Forest View Psychiatric Hospital, Inc.
Incorporated State:	Michigan
Fort Duncan Medical Center, Inc.
Incorporated State:	Delaware
Fort Duncan Medical Center, L.P.
Incorporated State:	Delaware
Fort Duncan Medical Receivables, L.L.C
Incorporated State:	Delaware
Frontline Behavioral Health, Inc.
Incorporated State:	Delaware
Frontline Children’s Hospital, L.L.C.
Incorporated State:	Delaware
Frontline Hospital, LLC
Incorporated State:	Delaware
Frontline Residential Treatment Center, LLC
Incorporated State:	Delaware
Glen Oaks Hospital, Inc.
Incorporated State:	Texas
Gulph Investments
Incorporated State:	Maryland
HRI Clinics, Inc.
Incorporated State:	Massachusetts
HRI Hospital, Inc.
Incorporated State:	Massachusetts
Health Care Finance & Construction Corp.
Incorporated State:	Delaware
Heart Clinic, P.L.L.C.
Incorporated State:	Texas
KEYS Group Holdings, LLC
Incorporated State:	Delaware
Keystone Charlotte LLC
Incorporated State:	North Carolina
Keystone Continuum LLC
Incorporated State:	Tennessee

Keystone DJJ LLC
Incorporated State:	Florida
Keystone Detention LLC
Incorporated State:	Alabama
Keystone Education Transportation, LLC
Incorporated State:	California
Keystone Education and Youth Services, LLC
Incorporated State:	Tennessee
Keystone JJAEP LLC
Incorporated State:	Texas
Keystone Marion, LLC
Incorporated State:	Virginia
Keystone Memphis, LLC
Incorporated State:	Tennessee
Keystone NPS LLC
Incorporated State:	California
Keystone Nevada, LLC
Incorporated State:	Nevada
Keystone Newport News, LLC
Incorporated State:	Virginia
Keystone Richland Center LLC
Incorporated State:	Ohio
Keystone Savannah, LLC
Incorporated State:	Georgia
Keystone WSNC, L.L.C.
Incorporated State:	North Carolina
Keystone/CCS Partners LLC
Incorporated State:	Delaware
Kids First Foundation
Incorporated State:	California
La Amistad Residential Treatment Center, Inc.
Incorporated State:	Florida
Lakewood Ranch Imaging Center, L.L.C.
Incorporated State:	Florida
Lakewood Ranch Medical Center Auxiliary, Incorporated
Incorporated State:	Florida

Lancaster Hospital Corporation
Incorporated State:	California
Lancaster Hospital Receivables, L.L.C
Incorporated State:	Delaware
Laredo ASC, Inc.
Incorporated State:	Texas
Laredo Holdings, Inc.
Incorporated State:	Delaware
Laredo MOB Partners, Ltd.
Incorporated State:	Texas
Laredo Providence Management, L.L.C.
Incorporated State:	Texas
Laredo Regional Medical Center, L.P.
Incorporated State:	Delaware
Laredo Regional Receivables, L.L.C
Incorporated State:	Delaware
Laredo Regional, Inc.
Incorporated State:	Delaware
Manatee Memorial Hospital, L.P.
Incorporated State:	Delaware
Manatee Memorial Receivables, L.L.C
Incorporated State:	Delaware
McAllen Edinburg Health Care Network Physician Hospital Organization
Incorporated State:	Texas
McAllen Heart Hospital, L.P.
Incorporated State:	Texas
McAllen Holdings, Inc.
Incorporated State:	Delaware
McAllen Hospitalist Group, PLLC
Incorporated State:	Texas
McAllen Hospitals Receivables, L.L.C
Incorporated State:	Delaware
McAllen Hospitals, L.P.
Incorporated State:	Delaware
McAllen Medical Center Foundation
Incorporated State:	Texas

McAllen Medical Center Physicians, Inc.
Incorporated State:	Texas
McAllen Medical Center, Inc.
Incorporated State:	Delaware
Meridell Achievement Center, Inc.
Incorporated State:	Texas
Merion Building Management, Inc.
Incorporated State:	Delaware
Nevada Preferred Professionals, Inc.
Incorporated State:	Nevada
Nevada Radiation Oncology Center-West, L.L.C.
Incorporated State:	Nevada
Northern Nevada Ambulatory Surgical Center, L.L.C.
Incorporated State:	Nevada
Northern Nevada Diagnostic Imaging-Spanish Springs, L.L.C
Incorporated State:	Nevada
Northern Nevada Medical Center, L.P.
Incorporated State:	Delaware
Northwest Texas Healthcare Receivables, L.L.C
Incorporated State:	Delaware
Northwest Texas Healthcare System, Inc.
Incorporated State:	Texas
Northwest Texas Surgical Hospital, L.L.C.
Incorporated State:	Texas
Oasis Health Systems, L.L.C.
Incorporated State:	Nevada
PPS Courts Services, L.L.C
Incorporated State:	South Carolina
Park HealthCare Company
Incorporated State:	Tennessee
Pendleton Methodist Hospital, L.L.C.
Incorporated State:	Delaware
Pennsylvania Clinical Schools, Inc.
Incorporated State:	Pennsylvania
Plaza Surgery Center Limited Partnership
Incorporated State:	Nevada

Professional Probation Services, Inc.
Incorporated State:	Georgia
Professional Surgery Corporation of Arkansas
Incorporated State:	Arkansas
Providence ASC Management, L.L.C.
Incorporated State:	Texas
Providence Hospital Real Estate, L.P.
Incorporated State:	Texas
Rancho Springs Receivables, L.L.C
Incorporated State:	Delaware
Relational Therapy Clinic, Inc.
Incorporated State:	Louisiana
Renaissance Women’s Center of Edmond, L.L.C.
Incorporated State:	Oklahoma
Ridge Outpatient Counseling, L.L.C.
Incorporated State:	Kentucky
River Crest Hospital, Inc.
Incorporated State:	Texas
River Oaks, Inc.
Incorporated State:	Louisiana
South Texas Health System, L.L.C
Incorporated State:	Delaware
Southeastern Hospital Corporation
Incorporated State:	Tennessee
Southwest Outpatient Imaging Center, LLC
Incorporated State:	California
Sparks Family Hospital Receivables, L.L.C
Incorporated State:	Delaware
Sparks Family Hospital, Inc.
Incorporated State:	Nevada
St. Louis Behavioral Medicine Institute, Inc.
Incorporated State:	Missouri
St. Mary’s Physician Associates, L.L.C
Incorporated State:	Oklahoma
Stonington Behavioral Health, Inc.
Incorporated State:	Delaware

Summerlin Hospital Medical Center, LLC
Incorporated State:	Delaware
Summerlin Hospital Medical Center, L.P.
Incorporated State:	Delaware
Summerlin Hospital Receivables, L.L.C
Incorporated State:	Delaware
Surgery Center Property, L.L.C.
Incorporated State:	Delaware
Surgery Center at Centennial Hills, L.L.C
Incorporated State:	Nevada
Surgery Center at Wellington, L.L.C.
Incorporated State:	Florida
Surgery Center of Midwest City, L.P.
Incorporated State:	Delaware
Surgery Center of New Orleans East, L.L.C.
Incorporated State:	Delaware
Surgery Center of Waltham, Limited Partnership
Incorporated State:	Massachusetts
Surgery Center of the Temecula Valley, L.L.C.
Incorporated State:	Delaware
Tennessee Clinical Schools, Inc.
Incorporated State:	Tennessee
TexomaCare
Incorporated State:	Texas
The Arbour, Inc.
Incorporated State:	Massachusetts
The Bridgeway, Inc.
Incorporated State:	Arkansas
The Friends of Wellington Regional Medical Center, Inc.
Incorporated State:	Florida
The Pavilion Foundation
Incorporated State:	Illinois
Tonopah Health Services, Inc.
Incorporated State:	Nevada
Trenton Street Corporation
Incorporated State:	Texas

Turning Point Care Center, Inc.
Incorporated State:	Georgia
Two Rivers Psychiatric Hospital, Inc.
Incorporated State:	Delaware
UHS Advisory, Inc.
Incorporated State:	Delaware
UHS Behavioral Health Services, L.L.C.
Incorporated State:	Massachusetts
UHS Broadlane Holdings L.P.
Incorporated State:	Delaware
UHS Children Services, Inc.
Incorporated State:	Delaware
UHS Development Company, Inc.
Incorporated State:	Delaware
UHS Front Royal, L.L.C.
Incorporated State:	Delaware
UHS Good Samaritan, L.L.C.
Incorporated State:	Delaware
UHS Holding Company, Inc.
Incorporated State:	Nevada
UHS International, Inc.
Incorporated State:	Delaware
UHS Kentucky Holdings, L.L.C.
Incorporated State:	Delaware
UHS Midwest Center for Youth and Families, Inc.
Incorporated State:	Indiana
UHS Oklahoma City LLC
Incorporated State:	Oklahoma
UHS Receivables Corp.
Incorporated State:	Delaware
UHS Recovery Foundation, Inc.
Incorporated State:	Pennsylvania
UHS Sahara, Inc.
Incorporated State:	Delaware
UHS of Anchor, L.P.
Incorporated State:	Delaware

UHS of Barstow, L.L.C.
Incorporated State:	Delaware
UHS of Benton Day School and Treatment Program, Inc.
Incorporated State:	Delaware
UHS of Benton, Inc.
Incorporated State:	Delaware
UHS of Blue Ridge Mountains, L.L.C.
Incorporated State:	South Carolina
UHS of Bowling Green, Inc.
Incorporated State:	Delaware
UHS of Colorado, L.L.C.
Incorporated State:	Delaware
UHS of Cornerstone Holdings, Inc.
Incorporated State:	Delaware
UHS of Cornerstone, Inc.
Incorporated State:	Delaware
UHS of D.C., Inc.
Incorporated State:	Delaware
UHS of Delaware, Inc.
Incorporated State:	Delaware
UHS of Denver, Inc.
Incorporated State:	Delaware
UHS of Dover, L.L.C.
Incorporated State:	Delaware
UHS of Doylestown, L.L.C.
Incorporated State:	Delaware
UHS of Eagle Pass, Inc.
Incorporated State:	Delaware
UHS of Fairmount, Inc.
Incorporated State:	Delaware
UHS of Fuller, Inc.
Incorporated State:	Massachusetts
UHS of Georgia Holdings, Inc.
Incorporated State:	Delaware
UHS of Georgia, Inc.
Incorporated State:	Delaware

UHS of Greenville, Inc.
Incorporated State:	Delaware
UHS of Hampton Learning Center, Inc.
Incorporated State:	New Jersey
UHS of Hampton, Inc.
Incorporated State:	New Jersey
UHS of Hartgrove, Inc.
Incorporated State:	Illinois
UHS of Hidalgo, Inc.
Incorporated State:	Delaware
UHS of Indiana, Inc.
Incorporated State:	Indiana
UHS of Kootenai River, Inc.
Incorporated State:	Delaware
UHS of Lakeside, Inc.
Incorporated State:	Delaware
UHS of Lakewood Ranch, Inc.
Incorporated State:	Florida
UHS of Laurel Heights, L.P.
Incorporated State:	Delaware
UHS of Manatee, Inc.
Incorporated State:	Florida
UHS of New Orleans, Inc.
Incorporated State:	Louisiana
UHS of Odessa, Inc.
Incorporated State:	Texas
UHS of Oklahoma Receivables, L.L.C
Incorporated State:	Delaware
UHS of Oklahoma, Inc.
Incorporated State:	Oklahoma
UHS of Parkwood, Inc.
Incorporated State:	Delaware
UHS of Peachford, L.P.
Incorporated State:	Delaware
UHS of Pennsylvania, Inc.
Incorporated State:	Pennsylvania

UHS of Provo Canyon, Inc.
Incorporated State:	Delaware
UHS of Puerto Rico, Inc.
Incorporated State:	Delaware
UHS of Ridge, Inc.
Incorporated State:	Delaware
UHS of River Parishes, Inc.
Incorporated State:	Louisiana
UHS of Rockford, Inc.
Incorporated State:	Delaware
UHS of Salt Lake City, L.L.C
Incorporated State:	Delaware
UHS of Savannah, L.L.C.
Incorporated State:	Delaware
UHS of Spring Mountain, Inc.
Incorporated State:	Delaware
UHS of Springwoods, L.L.C.
Incorporated State:	Delaware
UHS of Sutton, Inc.
Incorporated State:	Delaware
UHS of TRC, Inc.
Incorporated State:	Delaware
UHS of Talbot, L.P.
Incorporated State:	Delaware
UHS of Texoma, Inc.
Incorporated State:	Delaware
UHS of Timberlawn, Inc.
Incorporated State:	Texas
UHS of Timpanogos, Inc.
Incorporated State:	Delaware
UHS of Waltham, Inc.
Incorporated State:	Massachusetts
UHS of Westwood Pembroke, Inc.
Incorporated State:	Massachusetts
UHS of Wyoming, Inc.
Incorporated State:	Delaware

UHS-Corona Receivables, L.L.C
Incorporated State:	Delaware
UHS-Corona, Inc.
Incorporated State:	Delaware
UHS-Lakeland Medical Center, L.L.C.
Incorporated State:	Delaware
UHSD, L.L.C
Incorporated State:	Nevada
UHSF, L.L.C
Incorporated State:	Delaware
UHSL, L.L.C
Incorporated State:	Nevada
UTC Management Company, Inc.
Incorporated State:	Texas
United HealthCare of Hardin, Inc.
Incorporated State:	Tennessee
Universal Community Behavioral Health, Inc.
Incorporated State:	Pennsylvania
Universal HMO, Inc.
Incorporated State:	Nevada
Universal Health Finance, L.L.C.
Incorporated State:	Delaware
Universal Health Network, Inc.
Incorporated State:	Nevada
Universal Health Recovery Centers, Inc.
Incorporated State:	Pennsylvania
Universal Health Services Foundation
Incorporated State:	Pennsylvania
Universal Health Services of Cedar Hill, Inc.
Incorporated State:	Texas
Universal Health Services of Palmdale, Inc.
Incorporated State:	Delaware
Universal Health Services of Rancho Springs, Inc.
Incorporated State:	California
Universal Treatment Centers, Inc.
Incorporated State:	Delaware

Valley Health System, LLC
Incorporated State:	Delaware
Valley Health System Receivables, L.L.C.
Incorporated State:	Delaware
Valley Hospital Medical Center, Inc.
Incorporated State:	Nevada
Valley Surgery Center, L.P.
Incorporated State:	Delaware
Ventures Healthcare of Gainesville, Inc.
Incorporated State:	Tennessee
Victoria Regional Medical Center, Inc.
Incorporated State:	Texas
Vista Diagnostic Center, L.L.C.
Incorporated State:	Nevada
Wellington Regional Diagnostic Center, L.L.C.
Incorporated State:	Florida
Wellington Regional Health & Education Foundation, Inc.
Incorporated State:	Florida
Wellington Regional Medical Center Incorporated
Incorporated State:	Florida
Wellington Regional Receivables, L.L.C
Incorporated State:	Delaware
Wellington Regional Urgent Care Center, L.L.C
Incorporated State:	Florida