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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).

Patient Reviews

Patient comments (0)

The overall average patient rating of Dr. Glenn Preston is Good. Dr. Preston has been reviewed by 1 patients who have provided 0 comments. The rating is 3.5 out of 5 stars.

Specialties & Research

Dr. Glenn Preston, MD, PHD is board certified in Hematology and Medical Oncology.

  • He has special expertise in 7 areas:
  • Acute Myeloid Leukemia
  • Cancer
  • Chronic Myeloid Leukemia
  • Chronic Myelomonocytic Leukemia
  • Deep Vein Thrombosis
  • Hepatitis C
  • Leukemia

Education & Awards

Dr. Preston graduated from University of Missouri at Columbia.


Dr. Preston has 13 hospital affiliations:

  • Seton Medical Center 
  • Sid Peterson Memorial Hospital 


  • Spanish
  • English

> > > > Dr. Glenn Preston, MD, PHD

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Additional Information
Dr. Glenn Geoffrey Preston MD and PHD is a male Internist, has 16 years of experience and practices in Internal Medicine, Hematology, and Medical Oncology.
Where does Dr. Glenn G. Preston practice?
Dr. Glenn Preston has 4 office locations.
Dr. Glenn Preston practices Internal Medicine, Hematology, and Medical Oncology near Spencer, IA.
Additional practice locations include: Marble Falls, TX and San Antonio, TX.
See Spencer Internists, Spencer Hematologists, and Spencer Oncologists.