GIA, the go-to group
for top value and

Your health is our practice


Our patients give GIA's care and
service the highest ratings.


GIA's physicians consistently surpass
national quality benchmarks.

Gastrointestinal Associates is leading the way in gastroenterology care in the greater Knoxville area. Founded in 1971, we now offer three accredited ambulatory surgery centers featuring modern equipment, highly trained staff, lower costs and greater convenience. All of our physicians are board certified, highly experienced and have specialized training in the diagnosis and treatment of diseases of the digestive system: esophagus, stomach, small and large intestine or colon, liver, pancreas and gallbladder.

GIA physicians perform approximately 15,000 colonoscopies each year – more than any other GI practice in the region – and our team has performed more than 250,000 procedures, including 200,000 colonoscopies over the past 15 years. That extensive experience benefits our patients. GIA considerably exceeds national benchmarks for finding and removing precancerous polyps, which means our patients are less likely to develop colorectal cancer.

Under the leadership of GIA co-founder Dr. Bergein “Gene” Overholt, who designed the flexible fiberoptic sigmoidoscope and colonoscope that led to the use of the lifesaving screening colonoscopy, GIA continues to pioneer gastrointestinal health care. In 1986, GIA opened the country’s first licensed and Medicare-certified endoscopic ambulatory surgery center, reducing patient cost and need for a hospital stay.

We continually strive to achieve the best possible outcomes for our patients, and we are honored that our efforts were recognized by the American College of Gastroenterology, which is rare for a private practice.

To learn more about our practice, visit the About Us section of this website.

Latest News

    • 21 APR 15
    • 0

    Reflux – Acid or Bile? Know the difference

    If you’ve ever suffered through a bout of severe vomiting, you also may have experienced the uncomfortable occurrence of regurgitating a bitter, greenish-yellow fluid. That fluid is bile, a substance produced by the liver and stored in the gallbladder that aids in the digestion of fats. If you’re suffering from chronic heartburn or have been

    • 20 MAR 15
    • 1

    Fecal transplants show promise in treating C. difficile infection

    Clostridium difficile infection, also known as C. difficile or C. diff infection, is a condition marked by medical issues ranging from severe diarrhea to life-threatening inflammation of the colon. It can be extremely difficult to treat, which is why the results of two studies about fecal transplants are so encouraging.

    • 02 MAR 15
    • 0

    Superbug concerns, questions spread nationwide

    It may sound like something out of a science fiction movie: a drug-resistant superbug bacteria claiming the lives of patients who were infected while undergoing medical procedures at an established hospital. Unfortunately, this alarming news is all too real. News media recently reported that two patients have died and five others were infected after being

    • 04 FEB 15
    • 0

    New cancer screening test now available

    You may have heard about Cologuard, a stool-based colorectal screening test that received FDA approval in 2014 and now is available by prescription. The noninvasive test detects DNA from abnormal cells and hemoglobin from red blood cells that may indicate the presence of certain kinds of growths that could be cancerous, such as colon cancer, or

Appointment Resources

Request an Appointment

You can visit us at a time and location most convenient for you. Click below for information.


My First Visit

Click below to learn more about Gastrointestinal Associates’ history of innovative care, cutting-edge facility, board certified physicians and gracious staff.


Online Registration

If you would like to complete your patient registration information prior to your visit, please click the link below.


How Do I Prepare?

Learn more about your procedure, as well as a checklist to prepare for your exam.


Insurance Information

Please click below for information about health care, insurance and the policies of this practice.