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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

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Specialties & Research

Dr. William Dreyer, MD is board certified in Pediatric Cardiology.

  • He has special expertise in 10 areas:
  • Cardiopulmonary Bypass (CPB)
  • Congenital Heart Defects
  • Coronary Disease
  • Dilated Cardiomyopathy
  • Heart Failure
  • Heart Transplantation
  • Hypertrophic Cardiomyopathy
  • Left Ventricular Dysfunction
  • Low Cardiac Output
  • Myocardial Diseases

Education & Awards

Dr. Dreyer graduated from University of Florida, Gainesville. He has 2 awards.

One of America's Leading Experts on:
Heart Transplantation
Castle Connolly America's Top Doctors® (2002 - 2008, 2010 - 2015)


Dr. Dreyer has 15 hospital affiliations:

  • The Woman's Hospital of Texas 
  • Memorial Hermann Southwest Hospital 


  • Spanish

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Additional Information
Dr. William Jeffrey Dreyer MD is a male Pediatric Cardiologist, has 30 years of experience and practices in Pediatric Cardiology.
Where does Dr. William J. Dreyer practice?
Dr. William Dreyer has 4 office locations.
Dr. William Dreyer practices Pediatric Cardiology near Houston, TX.
See Houston Cardiologists.