Gastroenterology

About

We are located right in your community, with more than 60 providers that excel at what they do -- everything from working to beat colon cancer to helping patients manage their Crohn's and Colitis to getting to the bottom of heartburn and other digestive related diseases.

Our doctors are specifically trained to care for diseases of the esophagus, stomach, liver, colon, intestines, and gallbladder, so you'll get the peace of mind only a specialist can offer.

Adenoma Detection Rate

An adenoma is a benign (non-cancerous) tumor that over time can progress to become malignant (cancerous). The purpose of removing adenomas in the colon is to prevent colon cancer.

The adenoma detection rate (ADR) is the most important quality indicator, since it describes the percentage of patients in whom adenomatous polyps are identified by the physician performing the colonoscopy. The higher the percentage, the better the physician is at identifying and removing adenomas.

Learn more about our endoscopy centers, accreditation, and quality standards.

Team

The Oregon Clinic brings together more than 60 of the top providers in the gastroenterology field. Our doctors are highly skilled in all aspects of general gastroenterology, including diagnosis and treatment of digestive diseases, colon cancer screening and prevention, and performance of both upper endoscopy and colonoscopy.

Meet Our Providers:

Vesna Ader, PA-C

Areas of Focus:

Gastroenterology

Tulika Agarwal, PA-C

Areas of Focus:

General Gastroenterology, Colon Cancer Screening and Prevenetion

Paul Anderson, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Gastroesophageal Reflux Disease (GERD), Inflammatory Bowel Disease (IBD), Liver Disease, Swallowing Dysfunction

Brian Applebaum, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Diseases of the Liver and Biliary Tract, Inflammatory Bowel Disease (IBD)

Michelle Beilstein, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Colorectal Cancer, Gastroenterology, Hepatology, Pancreatic Cancer

Kent Benner, MD

Areas of Focus:

Hepatology

Sidharth Bhardwaj, MD

Areas of Focus:

General Gastroenterology, Colon Cancer Screening and Prevention, Video Capsule Endoscopy, Deep Small Intestinal Endoscopy, Small Bowel Diseases

Harry Bray, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Inflammatory Bowel Disease (IBD), Irritable Bowel Syndrome (IBS), Acid Reflux and Dyspepsia, Small Intestine Imaging

Mark Cahill, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Gastroesophageal Reflux Disease (GERD), Inflammatory Bowel Disease (IBD), Liver Disease, Swallowing Dysfunction

Amy Caine, PA-C, MPAS

Areas of Focus:

General Gastroenterology, Liver Disease, Viral Hepatitis, Colon Cancer Screening and Prevention, Acid Reflux

C.Y. Michael Chang, MD

Areas of Focus:

Barrett's Ablation, Small Bowel Diseases, Colon Health, Gastroenterology, Hepatology, Pillcam

Stephen Chen, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Advanced Inflammatory Bowel Disease (IBD), Diseases of the Liver and Biliary Tract, Small Bowel Diseases, Gastroenterology, Capsule Endoscopy/ERCP

Ryan Childers, MD

Areas of Focus:

Inflammatory Bowel Disease (IBD), Colon Cancer Screening and Prevention, Liver Disease, Gastroesophageal Reflux Disease (GERD), Disorders of the Stomach and Small Bowel, Capsule Endoscopy, Gastrointestinal Motility Disorders

Leslie Cline, PA-C, MPAS

Areas of Focus:

Abdominal Infections, Nutrition, Wellness

Aaron Cosman, FNP-BC

Areas of Focus:

General Gastroenterology, Colon Cancer Screening and Prevention, Gastroesophageal Reflux Disease (GERD), Irritable Bowel Syndrome (IBS), Pancreatobiliary Disease

Sergio Crespo, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Disease of the Liver and Biliary Tract, Hepatology, Gastroesophageal Reflux Disease (GERD), Inflammatory Bowel Disease (IBD)

Adrian Davies, FNP-BC

Areas of Focus:

General Gastroenterology, Hepatology, Inflammatory Bowel Disease (IBD), Reflux Disease, Viral Hepatitis

Viju P. Deenadayalu, MD

Areas of Focus:

General Gastroenterology, Colon Cancer Screening and Prevention, Inflammatory Bowel Disease (IBD), Acid Reflux, Diseases of the Esophagus, Stomach, Small Intestine and Colon

Jeffrey Douglass, MD

Areas of Focus:

General Gastroenterology, Endoscopic Retrograde Cholangiopancreatography (ERCP), Advanced Inflammatory Bowel Disease (IBD), Liver Disease, Colon Cancer Screening and Prevention

Jeffrey Duman, MD

Areas of Focus:

Swallowing Dysfunction, Intestinal Bleeding, Capsule Endoscopy, Inflammatory Bowel Disease (IBD), Liver Disease

Glenn Eisen, MD, MPH

Areas of Focus:

Gastroesophageal Reflux Disease (GERD), Colon Cancer Screening and Prevention, Barrett's Ablation, Inflammatory Bowel Disease (IBD), Capsule Endoscopy

Craig Fausel, MD

Areas of Focus:

General Gastroenterology, Crohn's Disease, Ulcerative Colitis, Inflammatory Bowel Disease (IBD), Swallowing Dysfunction

Rebecca Fausel, MD

Areas of Focus:

Inflammatory Bowel Disease (IBD), Ulcerative Colitis, Crohn's Disease

Ken Flora, MD, FACG, AGAF

Areas of Focus:

Diseases of the Liver and Biliary Tract, Cirrhosis, Viral Hepatitis, Endoscopic Retrograde Cholangiopancreatography (ERCP)

Mary Gilley, ANP-BC

Areas of Focus:

General Gastroenterology, Inflammatory Bowel Disease (IBD), Gastroesophageal Reflux Disease (GERD), Colon Cancer Screening and Prevenetion, Deep Small Intestinal Endoscopy

David Grunkemeier, MD

Areas of Focus:

Advanced Inflammatory Bowel Disease (IBD), Colorectal Cancer, Hepatology and Liver Disease, Celiac Disease, Research

Erica Heagy, FNP-BC

Areas of Focus:

Inflammatory Bowel Disease (IBD), Ulcerative Colitis, Crohn's Disease, Colon Cancer Screening and Prevention, Gastroesophageal Reflux Disease (GERD)

Margot Herman, MD

Areas of Focus:

Advanced Inflammatory Bowel Disease (IBD), Colon Cancer Screening and Prevention, Celiac Disease, Irritable Bowel Syndrome (IBS), Motility Disorders, General Gastroenterology, Gastroesophageal Reflux Disease (GERD)

Jeremy Holden, MD

Areas of Focus:

Hepatology, Liver Disease, Cirrhosis, Hepatitis

Terrance James, FNP

Areas of Focus:

Hepatology

Alan Kaynard, MD, PhD

Areas of Focus:

Colon Cancer Screening and Prevention, Gastroesophageal Reflux Disease (GERD), Inflammatory Bowel Disease (IBD), Disease of the Liver and Biliary Tract, Deep Small Intestinal Endoscopy

Tesslyn Keim, PA-C

Areas of Focus:

General Gastroenterology

Betty Kim, MD

Areas of Focus:

Inflammatory bowel disease (Crohn's disease and Ulcerative Colitis), Colon Cancer Screening and Prevention, Acid Reflux, Swallowing Dysfunction, General Gastroenterology

Kirsten Kinsman, MD

Areas of Focus:

Capsule Endoscopy, Colon Cancer Screening and Prevention, General Gastroenterology, Inflammatory Bowel Disease (IBD), Pelvic Floor Disorders

Phillip Kiyasu, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Inflammatory Bowel Disease (IBD), Small Bowel Diseases, Capsule Endoscopy, Balloon Small Bowel Enteroscopy

Jennifer Kuhn, ANP-BC

Areas of Focus:

Colon Cancer Screening and Prevention, Gastroesophageal Reflux Disease (GERD), Diarrhea, Fecal Incontinence, Celiac Disease

Brent Lee, MD

Areas of Focus:

Celiac Disease, Colon Cancer Screening and Prevention, Gastroesophageal Reflux Disease (GERD), Inflammatory Bowel Disease (IBD), Irritable Bowel Syndrome (IBS)

Ronald Lew, MD, FASGE

Areas of Focus:

Barrett's Esophagus and Esophageal Cancer, Colon Cancer Screening and Prevention, Endoscopic Retrograde Cholangiopancreatography (ERCP), Endoscopic Ultrasound (EUS), Gallbladder and Pancreatic Diseases

Shannon Lewis, MD

Areas of Focus:

Celiac Disease, Colon Cancer Screening and Prevention, Gastroesophageal Reflux Disease (GERD), Gastrointestinal Motility Disorders, Inflammatory Bowel Disease (IBD), Irritable Bowel Syndrome (IBS)

Sophia Lichenstein-Hill, FNP, DNP

Areas of Focus:

General Gastroenterology, Acid Reflux, Constipation, Dyspepsia, Irritable Bowel Syndrome (IBS)

Donald Lum, MD

Areas of Focus:

Inflammatory Bowel Disease (IBD), Colonoscopy, Colon Cancer Screening and Prevention

Izabela Maciolek, MPAS, PA-C

Areas of Focus:

Gastroenterology, Hepatology, Inflammatory Bowel Disease (IBD)

Asuka Murata, PA-C

Areas of Focus:

Gastroenterology

Michael Owens, MD

Areas of Focus:

Advanced Therapeutic Endoscopy, Barrett's Esophagus Treatment, Colon Cancer Screening and Prevention, Gastrointestinal Cancer, Pancreatic and Biliary Diseases

Monina Pascua, MD, PharmD, MSCE

Areas of Focus:

Colon Cancer Screening and Prevention, Gastroenterology, Hepatology, Inflammatory Bowel Disease (IBD), Women's Health

Michael Phillips, MD

Areas of Focus:

Endoscopic Ultrasound (EUS), Endoscopic Retrograde Cholangiopancreatography (ERCP), Pancreatobiliary Disease, Nutrition

Anthony Razzak, MD

Areas of Focus:

Gastrointestinal Cancer, Esophageal Disorders, Pancreaticobiliary Disease, Endoscopic Ultrasound (EUS), Endoscopic Retrograde Cholangiopancreatography (ERCP), Small Bowel Endoscopy

Ken Reckard, MS, PA-C

Areas of Focus:

General Gastroenterology, Acute GI Care, Colon Cancer Screening and Prevention, Intestinal Bleeding, Gastroesophageal Reflux Disease (GERD)

Swapna Reddy, MD

Areas of Focus:

Inflammatory Bowel Disease (IBD), Crohn's Disease, Ulcerative Colitis, Nutrition, Pelvic Floor Disorders

James Regan, MD

Areas of Focus:

Pancreatobiliary Disease, Endoscopic Ultrasound (EUS), Endoscopic Retrograde Cholangiopancreatography (ERCP), Inflammatory Bowel Disease (IBD), General Gastroenterology

Sarah "Betsy" Rodriguez, MD

Areas of Focus:

Pancreas and Biliary Disease, Gastroesophageal Reflux Disease (GERD), Colon Cancer Screening and Prevention, General Gastroenterology, Endoscopic Ultrasound (EUS)

Karen Saks, MD

Areas of Focus:

Esophageal Motility, Gastroesophageal Reflux Disease (GERD), Inflammatory Bowel Disease (IBD), Colon Cancer Screening

Alan Savoy, MD

Areas of Focus:

General Gastroenterology, Irritable Bowel Syndrome (IBS), Endoscopic Ultrasound (EUS), Barrett's Ablation, Endoscopic Mucosal Resection

Mark Schiele, MD

Areas of Focus:

General Gastroenterology, Inflammatory Bowel Disease (IBD), Colon Cancer Screening and Prevention, Diseases of the Liver and Biliary Tract, Irritable Bowel Syndrome (IBS)

Jennifer Semmelroth, MPAS, PA-C

Areas of Focus:

Gastroenterology

Michael Sheffield, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Gastroesophageal Reflux Disease (GERD), Inflammatory Bowel Disease (IBD), Esophageal Manometry, Diseases of the Liver and Biliary Tract

Hong Shen, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Inflammatory Bowel Disease (IBD), Viral Hepatitis, Esophageal Manometry, Colonoscopy

Douglas Shumaker, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Endoscopic Retrograde Cholangiopancreatography (ERCP), Endoscopic Ultrasound (EUS), General Gastroenterology, Pancreatobiliary Disease

Adam Silverblatt, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Inflammatory Bowel Disease (IBD), Endoscopic Retrograde Cholangiopancreatography (ERCP), Colonoscopy, Celiac Disease, General Gastroenterology, Gastroesophageal Reflux Disease (GERD)

Rodger A. Sleven, MD

Areas of Focus:

Colon Cancer Screening and Prevention, Gastroenterology Education, Inflammatory Bowel Disease (IBD), Irritable Bowel Syndrome (IBS), Video Capsule Endoscopy for Small Bowel Evaluation

Lehel Somogyi, MD

Areas of Focus:

Endoscopic Retrograde Cholangiopancreatography (ERCP), Endoscopic Ultrasound (EUS), Pancreatobiliary Disease, Barrett's Esophagus Treatment, General Gastroenterology

Christina Thompson, PA-C, MPAS

Areas of Focus:

Gastroenterology

Cristian Vallejos, MD

Areas of Focus:

Acute and Chronic Liver Disease, Colon Cancer Screening and Prevention, Inflammatory Bowel Disease (IBD), Internal Hemorrhoid Ligation

Erik Van Kleek, MD

Areas of Focus:

Barrett's Esophagus Treatment, Capsule Endoscopy, Colon Cancer Screening and Prevention, Esophagoscopy with Ablation (BARRx), Hepatitis

Amy Wang, MD, FASGE

Areas of Focus:

Inflammatory Bowel Disease (IBD), Colon Cancer Screening and Prevention, Gastroesophageal Reflux Disease (GERD), General Gastroenterology

Anne Wang, MD

Areas of Focus:

Gastroenterology

Kayleen Welbourn, PA-C, MPAS

Areas of Focus:

General Gastroenterology

Jeffrey Weprin, MD

Areas of Focus:

Inflammatory Bowel Disease (IBD), Celiac Disease, Colon Cancer Screening and Prevention, Esophageal Disorders, Esophageal Manometry

Diane Williams, DO

Areas of Focus:

Colorectal Cancer, Acid Reflux, Inflammatory Bowel Disease (IBD), Irritable Bowel Syndrome (IBS), Intestinal Bleeding

Christopher Woods, PA-C

Areas of Focus:

General Gastroenterology, Hepatitis C, Hepatitis B, Biliary Diseases, Colon Cancer

Zibing Woodward, MD

Areas of Focus:

Advanced Inflammatory Bowel Disease (IBD), Small Bowel Pathology and Double Balloon Enteroscopy, Barrett's Esophagus and Esophageal Cancer, Colon Cancer Screening and Prevention, Liver Disease

Amy Zhu, MD

Areas of Focus:

Colon Cancer Screening and Prevention, General Gastroenterology, Inflammatory Bowel Disease (IBD), Irritable Bowel Syndrome (IBS), Celiac Disease

Conditions & Procedures

Below you will find some quick links to different conditions, procedures, and diseases.

Conditions & Diseases

Anal Fissure

Anal Abscess and Fistula

Autoimmune Hepatitis

Barrett's Esophagus

Celiac Disease

Cirrhosis of the Liver

Clostridium Difficile

Collagenous Colitis & Lymphocytic Colitis

Colon Polyps and Cancer

Constipation

Crohn's Disease

Cyclic Vomiting Syndrome

Diarrhea

Diverticulosis and Diverticulitis

Eosinophilic Esophagitis

Fatty Liver

Fecal Incontinence

Fructose Intolerance

Functional or Nonulcer Dyspepsia

Gallstones

Gas in the Digestive Tract

Gastritis

Gastroesophageal Reflux Disease (GERD)

Gastroparesis

H. pylori and Peptic Ulcers

Inflammatory Bowel Disease (IBD)

Intestinal Pseudo-Obstruction

Irritable Bowel Syndrome (IBS)

Lactose Intolerance

Nonalcoholic Steatohepatitis

Pancreatitis

Peptic Ulcers

Prevention Colon Polyps & Cancer

Primary Biliary Cirrhosis

Primary Sclerosing Cholangitis

Proctitis

Rapid Gastric Emptying

Rectal Bleeding

Ulcerative Colitis

Procedures

Bowel Diversion Surgeries

Capsule Endoscopy

Colonoscopy

Endoscopic Retrograde Cholangio Pancreatography (ERCP)

Flexible Sigmoidoscopy

Upper Endoscopy

News

PPI's & the association with Chronic Kidney Disease & Dementia. Are you taking PPI's and concerned about your health? Recently, a study was published in the Journal of the American Medical Association (JAMA) that...continue reading

Since November 2014, each of our three gastroenterology groups has been participating in the GI Quality Improvement Consortium (GIQuIC) program. Being part of this organization requires a focus on enhancing patient care through real-time peer-based performance evaluation. Click to read more on the GIQuIC website.

The Oregon Clinic Gastroenterology - East's Liver Clinic has been recognized by the NCQA as a patient-centered speciaty practice. Earning this recognition shows consumers that the practice has undergone a rigorous review of its capabilities and is committed to sharing information and coordinating care.

All of our Gastroenterology endoscopy centers have been accredited by the American Society for Gastrointestinal Endoscopy (ASGE) as a quality endoscopy center. Learn more

Specialty Medicine with Commitment, Care & Compassion

Gastroenterology

About

Team

Conditions & Procedures

News

Preps

Diets

About

Adenoma Detection Rate

Team

Meet Our Providers:

Conditions & Procedures

Conditions & Diseases

Procedures

News

Preps

Colonoscopy Prep

Upper Endoscopy Prep (EGD, ERCP, Upper Endoscopic US)

Lower Endoscopy (Flex Sig, Lower Endoscopy US)

Esophageal Manometry and pH Impedance

Fecal Fat Test Prep

Additional Information For All Procedures

Translated Preps

Gastroenterology - East Additional Preps

M2A - Capsule Endoscopy Preps

Additional Preps

Gastroenterology - South Additional Preps

Anorectal Manometry (ARM)

M2A - Capsule Endoscopy Preps

EGD - Capsule Endoscopy Preps

Diets

Diets