Dena Witthaus, DO

Providing quality, compassionate care for you and your family

Dena Witthaus, DO

Personal Biography:

Dr. Witthaus is chief resident of Samaritan Health Services' Internal Medicine Residency Program.

She earned a bachelor’s degree in applied mathematics from University of California, Riverside and a medical degree from Arizona College of Osteopathic Medicine.

She enjoys establishing long-term relationships with her patients and has a special interest in preventative health care.

In her free time, Dr. Witthaus enjoys cooking, gardening and a variety of outdoor activities, including running and biking.

Medical Education and Training:

Bachelor's degree: University of California, Riverside
Medical degree: Arizona College of Osteopathic Medicine



  • Internal Medicine
    Internal medicine providers focus on adult medicine and have had special training to diagnose and treat adult diseases. They may be physicians, nurse practitioners or physician assistants. They serve as a primary care provider for their patients.
  • Resident Physician
    Resident physicians, known as residents, have earned medical degrees and practice medicine under the supervision of fully licensed physicians, usually in a hospital or clinic.

    Medical residency provides in-depth training within a specific branch of medicine such as family practice, internal medicine, psychiatry, orthopedic surgery, general surgery or other specialties and builds upon the broad range of medical knowledge and basic clinical skills learned in medical school, enabling the physician to get more hands-on medical practice experience.