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About

Samaritan Gastroenterology in Corvallis is part of Samaritan Health Services, a nonprofit health system headquartered in Corvallis, Oregon. SHS operates a multi-hospital network with over 110 physician clinics and several health services in the Willamette Valley and central Oregon Coast. The Corvallis location is linked to Samaritan’s main headquarters and GI services are offered within the larger Samaritan Health Services system, which employs thousands of staff and physicians and serves as a major regional healthcare provider. If you’re seeking gastroenterology care specifically in Corvallis, you’ll likely be treated within the Samaritan Health Services network (Corvallis facilities), with access to integrated services and referrals across SHS. For precise clinic address, appointment options, and GI specialists, contact SHS patient services or visit samhealth.org.

Clinic Type

Gastroenterology

Address

3521 NW Samaritan Dr Suite 101, Corvallis, OR 97330-4744

Phone

541-768-6119

Email

info@asge.org

Opening Hours

Hours: Monday through Friday 8 a.m. to 4:30 p.m.

Services Offered

  • Colonoscopy
  • Flexible sigmoidoscopy
  • Upper endoscopy (EGD)
  • Endoscopic Retrograde Cholangiopancreatography (ERCP)
  • Endoscopic ultrasonography with fine-needle aspiration
  • Capsule endoscopy (PillCam)
  • Polyp detection and removal
  • Colorectal cancer screening
  • Esophageal dilation
  • Percutaneous endoscopic gastrostomy
  • Bravo pH studies
  • Hemorrhoid banding

Technology & Equipment

  • PillCam
  • ERCP
  • endoscopic ultrasonography
  • Bravo pH studies
  • colonoscopy
  • sigmoidoscopy
  • EGD
  • hemorrhoid banding

Insurance & Payment

Pay your bill (online), Make a payment

Languages Spoken

Current Offers

New patient offer

FAQs

Preparing for my colonoscopy, what should I review in advance?

Preparation Guide & FAQ’s.

What dietary guidelines are suggested before the procedure?

Low Residue Diet Meal Suggestions.

What diet should I follow the day before or on the day of the procedure?

Clear Liquid Diet Meal Suggestions.

What are the benefits, risks, and alternatives of the procedure?

Benefits Risks Alternatives.

How can I recognize a successful bowel prep?

Recognizing a Successful Bowel Prep.

Photos

What Patients Say

Overall sentiment across review platforms: mixed

  • Healthgrades (Dr. Keith Harris): 3.7 / 5 (25 ratings)
  • Healthgrades (Dr. Robert Wohlman): 3.5 / 5 (32 ratings)
  • Vitals (Dr. Andrei Gasic): 4.0 / 5 (23 ratings)
  • Vitals (Dr. Adam Silverblatt): 5.0 / 5 (7 ratings)
  • Vitals (Dr. Matthew Walton): 2.0 / 5 (1 rating)

Patients praise

  • Highly knowledgeable and skilled doctors
  • Effective, life-saving treatment for chronic gastrointestinal conditions
  • Some providers described as compassionate, thorough, and good communicators

Common complaints

  • Perceived lack of listening or care from some providers
  • Reports of unprofessionalism from some staff members
  • Long wait times for appointments with certain doctors
  • General frustrations with the larger Samaritan Health Services system including perceived lack of follow-up on complaints

"This doctor is highly knowledgeable and tells it like it is with great love and care in his voice. ... I feel that Dr. Harris has improved my quality of life 100%."

Healthgrades patient review for Dr. Keith Harris

"Again, he listens and CARES!"

Healthgrades patient review for Dr. Robert Wohlman

"The entire time I was a patient there I was "cared for" by an exceptionally rude nurse. Worst place ever."

Vitals patient review for Dr. Andrei Gasic (regarding office staff)

Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 11, 2026.

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