Gastrointestinal & Minimally Invasive Surgery at Gateway

Phone: 
(503) 281-0561
Fax: 
(503) 281-0575
M-F: 8:30am - 4:30pm
Phones Answered M-F: 9:00am - 4:30pm
Located at Gateway Medical Office
1111 NE 99th Ave. Suite 301
Portland, OR 97220
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About

Thank you for choosing the Gastrointestinal and Minimally Invasive Surgery (GMIS) specialty of The Oregon Clinic. Our group of general and minimally invasive specialists includes board-certified physicians that are fellowship trained in general and colorectal surgery. They are among the best in the Western United States and across the country. The surgeons provide complete evaluation, diagnosis, and surgical treatment for a wide variety of disorders. We have pioneered some of the most advanced, minimally invasive procedures while achieving the fewest complications, highest survival rates and best outcomes in the state. 

A small sample of our medical focus includes acid reflux, hemorrhoids, gallbladder, thyroid and parathyroid disease, varicose veins, hernia repair, appendix removal, colon cancer, gastrointestinal disease and liver and pancreatic disease. 

The GMIS specialty is dedicated to a team approach to provide state-of-the-art, proven medicine that is delivered with great care and compassion. We believe that good patient education is good medicine and believe in working with our patients to educate you about risk factors and lifestyle changes that can help prevent disease. Our surgeons are involved in multiple research studies, all aimed at providing the best long-term outcome possible. 

 

Some of our areas of focus include:

 

Team

Providers

Mark Whiteford, MD, FACS, FASCRS
Areas of Focus:
Laparoscopic Treatment of Colon and Rectal Diseases, Surgery for Colon and Rectal Cancer and Polyps, Surgery for Ulcerative Colitis, Crohn's Disease, and Diverticulitis, Minimally Invasive & Sphincter Sparing Rectal Surgery, Transanal endoscopic microsurgery (TEM), Anal Abscess, Fistula, and Fissures, Anal Dysplasia and Cancer
more

Forms

To expedite your check-in process, please print and complete any applicable forms from our patient portal, MyHealthConnection (no login required).

Directions

Head North on 99th Ave., past Northeast Pacific Street. Turn left into The Oregon Clinic's patient parking lot. Once through the front sliding doors, turn left, and look for the sign for Gastroenterology.
 
I-84 going East
Take Exit 7 for Halsey St. toward Gateway District
Keep Right at the fork, follow signs for 99th Ave.
Arrive in 0.1 miles to your right.
 
I-84 going West
Take Exit 9 on the Left for I-205 South
Keep Left at the fork, follow signs for I-205 S/Salem
Take Exit 21A for Glisan St. toward Stark St.
Turn Left onto Glisan St.
Turn Left onto 99th Ave.
Arrive in 0.3 miles to your right.
I-205 going North
Take Exit 21A for Glisan St.
Turn Right onto NE Glisan St.
Turn Left onto NE 99th Ave.
Arrive in 0.3 miles to your left.
 
I-205 going South
Take Exit 21A for Glisan St.
Turn Left onto NE Glisan St.
Turn Left onto NE 99th Ave.
Arrive in 0.3 miles to your left.