Northwoods Healthcare

C.A. Dean provides physician services & primary care through their Northwoods Healthcare division. With three full time MD, one full time DO, and one full time Physician Assistant and 2 full time Family Nurse Practitioners. Northwoods Healthcare has offices in Greenville, Sangerville, and Monson.

  • NCQA Certified
  • Patient Centered Medical Home-Level 3

  • Total Family Healthcare
  • Stress Testing
  • Lab services
  • Pulmonary Function Testing
  • Vascular testing
  • Occupational Manipulative Therapy (OMT)
  • Point of Care INR testing
  • Prenatal Care
Greenville Clinic
Walk in Clinics May Be Available. Please Call 695-5220 for Schedule

Sangerville Clinic
Walk in Clinics May Be Available. Please Call 695-5220 for Schedule
Fridays 2-4
Lab hours M,W,F 8-5 and Tues and Thurs 7-5

Monson Clinic
Tuesday 1-4

Below is a listing of our active and consulting medical community.

Meet your Family Practice Providers at Northwoods Healthcare:

Elisa Thomson MD
I grew up in Guilford, Maine, and am a graduate of Bowdoin College and Dartmouth Medical School.  I am interested in patient education, management of chronic diseases, and adolescent health.  I enjoy traveling, cooking, golf and running in addition to spending time with family.

Diana Vandermast, FNP
Diana Vandermast is available to accept new patients at Northwoods Healthcare in Sangerville. She is a Family Nurse Practitioner with 10 years of experience providing primary care to people of all ages in Maine.

Diana grew up on Peaks Island and completed her Masters Degree in Nursing at the University of Southern Maine in 2004. She worked in Southern Maine and then Washington County before settling in Piscataquis county, where she now resides. Diana believes that good health requires a partnership between the provider and the patient. She hopes to help people achieve their best health at all stages of life. Diana enjoys the outdoors, and her family. 


Galen Durose, MD
Dr. Durose is from Southern Ohio where he grew up on a farm. He enjoys whittling, hiking, music, films, gardening and traveling.
Special Medical Interests- mind, body and spirit medicine and he has a diploma from the Academy of Integrated Health and Medicine.
What brings him to Greenville?
The great outdoors!  He’s excited to take advantage of all the beautiful  outdoors and hiking that nature has to offer here with his wife and two small children.
Dr. Durose has been practicing rural medicine since he completed his residency in 2000 at Ohio Health-Grant Medical Center. He graduated from the University Of Cincinnati College Of Medicine in 1997.


Gregg Christensen,  PA-C
Albany - Hudson Valley Physician Assistant Program 1979. Clinical interests: family medicine.
Darin Peck,  MD
Graduate of Northeastern Ohio University's college of Medicine. Strong interest in rural healthcare and international, humanitarian medicine. Clinical Interests: family, geriatrics, and preventative medicine including allergy testing and pulmonary testing.