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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. Frederick Siefert:

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Specialties & Research

  • He has special expertise in 9 areas:
  • Alzheimer's Disease
  • Anemia
  • Bronchitis
  • Cholesterol Management
  • Diabetes
  • Diet Therapy
  • High Blood Pressure (Hypertension)
  • Obesity
  • Preventive Medicine

Education & Awards

Dr. Siefert graduated from New York Medical College, Valhalla.


Dr. Siefert has 3 hospital affiliations:

  • Greenwich Hospital Association 
  • Greenwich Hospital, Greenwich CT 
  • Greenwich Hospital 


  • Italian
  • German
  • Spanish

> > > > Dr. Frederick Siefert, MD

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Additional Information
Dr. Frederick Edward Siefert MD is a male Internist and practices in Internal Medicine and Geriatric Medicine.
Where does Dr. Frederick E. Siefert practice?
Dr. Frederick Siefert has 2 office locations.
Dr. Frederick Siefert practices Internal Medicine and Geriatric Medicine near Old Greenwich, CT.
Additional practice locations include: Greenwich, CT.
See Old Greenwich Internists and Old Greenwich Geriatric Doctors.