Exhibit 21.1

Name of Subsidiary	State of Formation	% Ownership
Urology Associates of North Texas, PLLC	Texas		100.0000	%
The Medical Clinic of North Texas, Inc.	Texas		100.0000	%
Impel Management Services, L.L.C.	Texas		100.0000	%
Impel Consulting Experts, LLC	Texas		100.0000	%
Surgery Center of Waxahachie, LP	Texas		4.5100	%
Mat-Rx Development, LLC d/b/a USMD Hospital Division	Texas		100.0000	%
USMD of Arlington GP, LLC	Texas		100.0000	%
USMD Cancer Treatment Centers, LLC	Texas		100.0000	%
USMD Diagnostic Services, LLC	Texas		100.0000	%
USMD Inc.	Texas		100.0000	%
Mat-Rx Fort Worth GP, LLC	Texas		100.0000	%
USMD Administrative Services, LLC	Texas		100.0000	%
Metro I Stone Management, Ltd.	Texas		60.0000	%
USMD Hospital at Arlington, L.P.	Texas		45.3959	%
USMD Hospital at Ft. Worth, L.P.	Texas		30.8765	%
MXMD Centros De Cancer, S. De R.L. De C.V.	Mexico City, F.D., Mexico		50.0000	%
Christus Meguerza Radio Terapia Avanzada, S.D. R.L. De C.V.	Nuevo Leon, Mexico		34.0000	%
USMD Affiliated Services*	Texas

* Texas not for profit Corporation of which USMD Inc. is the sole member