Summary

Dr. Diaz is MaineGeneral's Vice President of Medical Administration and an emergency department physician at MGMC's Thayer Campus.

Assistant director of the emergency department in Waterville and chief of the Waterville medical staff, Dr. Diaz also co-chairs MaineGeneral's Credentials and Bylaws Committee and serves on its Executive Committee and Board of Directors. He is involved in many of the quality initiatives in health care for MaineGeneral.

Dr. Diaz has practiced in this area since 1996.

Quick Facts

  • 5
  • 40 years of experience
  • speaks English
  • Beth Israel Medical Center
  • 1 written review
  • 1 specialty
  • 12 areas of expertise
  • 1 hospital affiliation
  • 1 office location
  • Male

Office Location

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Dr. David Greeno Preston, MDDr. George Costin, MDDr. Susan Ellen Dunn, MDDr. Renato De Leon Medrano, MD
Internal MedicineInternal MedicineNephrologyInternal Medicine
Accepts New Patients
2.5 
40 Years of Experience 23 Years of Experience 18 Years of Experience 39 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English
Waterville , MEAugusta , MEAugusta , MEPortland , ME
Med School: Harvard Medical School Med School: CAROL DAVILA UNIVERSITY OF MEDICINE AND PHARMACY Med School: Saba University School Of Medicine Med School: UNIVERSITY OF THE EAST/RAMON MAGSAYSAY MEMORIAL MEDICAL CENTER
Current Profile
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Insurance Plans Accepted by Dr. David Greeno Preston

Be sure to verify insurance information directly with your doctor's office, as it may undergo frequent changes.

Medical Specialties

Dr. David Greeno Preston has the following specialty

Specialty Expertise

Dr. David Greeno Preston has the following 12 areas of expertise

  • Check-up
  • Diabetes
  • Diabetes Complications
  • Heart Diseases
  • Heart Failure
  • Heartburn
  • Immunization
  • Physical
  • Stroke
  • Vaccination
  • Weight Loss
  • Weight Loss (non-surgical)

Certifications, License, & Education

40 Years Experience

MEDICAL LICENSE

Medical Doctor, Maine, 2026, Expired

EDUCATION & TRAINING

Residency

Beth Israel Medical Center

Medical School

Harvard Medical SchoolGraduated in 1986

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Frequently Asked Questions

Is Dr. David Preston accepting new patients?
Dr. David Preston has not indicated that they accept new patients. Contact their office through their Vitals profile to check for availability.
Where is Dr. David Preston's office located?
Dr. David Preston's office is located at 149 North St, Waterville, ME, 04901.
Does Dr. David Preston accept my insurance?
You can see the insurance plans that Dr. David Preston accepts on their Vitals profile.
How can I make an appointment with Dr. David Preston?
You can find contact information for Dr. David Preston here on Vitals.
Which hospitals is Dr. David Preston affiliated with?
Dr. David Preston is affiliated with Mainegeneral Medical Center Thayer Center For Health.

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