Exhibit 21.1

List of Subsidiaries of Holdings after the Closing of the Contribution

Name of Subsidiary	State of Formation
Urology Associates of North Texas, PLLC	Texas
The Medical Clinic of North Texas, Inc.	Texas
Impel Management Services, L.L.C.	Texas
Impel Consulting Experts, LLC	Texas
Rocky Mountain Medical Center, L.P.	Texas
Surgery Center of Waxahachie, LP	Texas
Mat-Rx Development, LLC, d/b/a USMD Hospital Division	Texas
USMD of Arlington GP, LLC	Texas
U.S. Lithotripsy, L.P. d/b/a USMD Lithotripsy Division	Texas
USMD Cancer Treatment Centers, LLC	Texas
USMD Diagnostic Services, LLC	Texas
USMD Inc.	Texas
Mat-Rx Fort Worth GP, LLC	Texas
USMD Administrative Services, LLC	Texas
USGP, LLC	Texas
Litho GP, LLC	Texas
Big Country II Lithotripsy, L.P.	Texas
Dallas Stone Management, L.P.	Texas
Ironwood Stone Management, L.P.	Texas
Tyler Stone Management, Ltd., d/b/a Lithotripsy of East Texas	Texas
Metro I Stone Management. Ltd.	Texas
Midland Stone Management, L.P.	Texas
Mississippi Valley I Stone Management, L.P.	Oklahoma
White River Lithotripsy, L.P.	Arkansas
Western Plains II Lithotripsy, L.P.	Texas
North Central Missouri III Lithotripsy, L.P.	Texas
North Texas Stone Management, LP	Texas
Verrazano Lithotripsy, L.P.	Texas
East Texas II—Athens, L.P.	Texas
East Texas II—Longview, L.P.	Texas
S.E. Colorado Lithotripsy, L.P.	Texas
Kenai Lithotripsy, L.P.	Alaska
Metro Houston Lithotripsy II, L.P.	Texas
Houston II Lithotripsy, L.P.	Texas
Millennium Lithotripsy, L.P.	Texas
Gateway II Lithotripsy, LLC	Missouri
Rio Grande Lithotripsy, L.P.	Texas
South Texas Lithotripsy, L.P.	Texas
USMD Hospital at Arlington, L.P.	Texas
USMD Hospital at Ft Worth, L.P.	Texas
Willowbrook Cancer Center, LLC	Texas
Anchorage Cancer Treatment Center, LLC	Alaska
MXMD Centros De Cancer, S. De R.L. De C.V.	Mexico City, F.D., Mexico
Christus Meguerza Radio Terapia Avanzada, S.D R.L. De C.V.	Nuevo Leon, Mexico
Yorktown Center for Radiation Oncolgy Services, L.L.C.	New York
USMD Affiliated Services	Texas