Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

David G Preston, MD

Individual provider Internal Medicine Physician · NPI 1871559203

David G Preston, MD is an Internal Medicine in Winslow, Maine. Graduated from Harvard Medical School in 1986, 40 years ago. Practices with Mainegeneral Medical Center, a 556-clinician group and accepts Medicare assignment. Licensed in Maine.

Years since qualifying
40
Trained at
Harvard Medical School
Licensed in
ME
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

80 Garland Rd
Winslow, ME 04901-0600
Phone: (207) 873-1098
Fax: (207) 861-5461
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 012727 (ME)

Record details

NPI number1871559203
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 25, 2006
Last updated in NPPESMay 5, 2008
Mailing addressPo Box 247, North Vassalboro, ME 04962-0247

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolHARVARD MEDICAL SCHOOL
Graduated 1986 (40 years in practice)
Group practice Mainegeneral Medical Center — 556 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount