Browse Health
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).

Patient Reviews

Have you visited Dr. Ontjes? Share your experience.
Write a Review

Specialties & Research

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

  • He has special expertise in 7 areas:
  • Adrenal Gland Diseases
  • Osteoporosis
  • Parathyroid Gland Cancer (Parathyroid Neoplasm)
  • Pituitary Diseases
  • Pituitary Gland Cancer
  • Thyroid Cancer
  • Thyroid Diseases

Education & Awards

Dr. Ontjes graduated from Harvard University , Boston.


Dr. Ontjes has 2 hospital affiliations:

  • University of North Carolina Hospitals at Chapel Hill 
  • University of North Carolina Hospitals 

> > > > Dr. David Ontjes, MD

Similar doctors nearby

Dr. David Clemmons

Internal Medicine
37 years experience
Durham, NC

Dr. Laura Young

Internal Medicine
8 years experience
Durham, NC

Dr. Jessica Stewart

Internal Medicine
5 years experience
Durham, NC

Dr. Kimberly Kylstra

Internal Medicine
24 years experience
Durham, NC

Dr. Carlton Miller

Internal Medicine
24 years experience
Durham, NC

Dr. William Singletary

Internal Medicine
36 years experience
Durham, NC
Search All Similar Doctors
Additional Information
Dr. David Ainsworth Ontjes MD is a male Internist, has 47 years of experience and practices in Internal Medicine.
Where does Dr. David A. Ontjes practice?
Dr. David Ontjes has 4 office locations.
Dr. David Ontjes practices Internal Medicine near Durham, NC.
Additional practice locations include: Chapel Hill, NC and Sanford, NC.
See Durham Internists.