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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).

Learn more about Dr. David Preston:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (1)

The overall average patient rating of Dr. David Preston is Excellent. Dr. Preston has been reviewed by 3 patients who have provided 1 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 5.0
Promptness 5.0
Courteous Staff 5.0
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 4.3
Follows Up After Visit 5.0

Specialties & Research

Dr. David Preston, MD is board certified in Internal Medicine.

  • He has special expertise in 5 areas:
  • Diabetes
  • Diabetes Complications
  • Heart Diseases
  • Heart Failure
  • Stroke

Education & Awards

Dr. Preston graduated from Harvard University , Boston. He has 2 awards.

Bridges to Excellence Recognition
Diabetes Care Recognition (2014 - 2016)
Level I
Cardiac Care Recognition (2014 - 2016)
Level I


Dr. Preston has 4 hospital affiliations:

  • Mainegeneral Medical Center 
  • American College of Physicians 


  • English

> > > Dr. David Preston, MD

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Additional Information
Dr. David G Preston MD is a male Internist, has 26 years of experience and practices in Internal Medicine.
Where does Dr. David G. Preston practice?
Dr. David Preston has 1 office location.
Dr. David Preston practices Internal Medicine near Winslow, ME.