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Catherine Hajek, MD  |  location phone (605) 328-7500

Accepting New Patients

Catherine Hajek, MD - Internal Medicine



Undergraduate School
University of Michigan (Ann Arbor, MI)
Graduate School
University of Michigan (Ann Arbor, MI)
Medical School
University of South Dakota (Vermillion, SD)
Exempla St. Joseph Hospital (Denver, CO)
Albert Einstein College of Medicine, Montefiore Medical Center (Bronx, NY)
Exempla St. Joseph Hospital (Denver, CO)
American Board of Internal Medicine

Areas of Expertise

Management of chronic diseases including diabetes and hypertension, preventative health care, executive health

Philosophy of Care

Dr. Hajek provides comprehensive care to her patients through an emphasis on preventive medicine and the management of chronic medical conditions. She believes that building strong relationships with patients is the key to providing quality medical care. Additionally, she has a strong interest in genomic medicine and will be starting a fellowship in July of 2014 in Medical Genetics. This additional training will allow her to supplement her primary care practice and treat patients using their genetic information in order to provide more personalized care.

Languages Spoken


Hobbies and Personal Interests

Cassie Hajek is married and enjoys spending time with family, cooking and traveling.


Primary Practice Location

Sanford Internal Medicine Clinic

1205 S Grange Avenue
Suite 510
Sioux Falls, SD  57105
Get Directions


M–F: 8:00 AM–5:00 PM



(605) 328-7500


(605) 328-7599
Additional Practice Locations

Sanford Health Executive Health Center

1205 S Grange Avenue
Suite 303
Sioux Falls, SD  57105
Get Directions


(605) 328-7090


(605) 328-7091