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Dr. Dennis Riff, MD

Gastroenterologist, Internist

Professional statement

Dr. Dennis S. Riff is the founder of AGMG medical group. Born in Philadelphia, Pennsylvania, he is the father of four children including a son who is a fellow in gastroenterology at the University of Pennsylvania and will hopefully be joining the practice in the future. Dr. Riff is the author of multiple articles appearing in the literature on the treatment of diseasse of the gastrointestinal tract and on multiple other conditions. Dr. Riff went to Franklin and Marshall College and then to Jefferson Medical College. He graduated from both schools with distinction and went on to do his internship in internal medicine at Thomas Jefferson University Hospital in Philadelphia. He is certified by the Board of Internal Medicinie. Dr. Riff moved to California in 1972 and did a residency in internal medicine as well as completed a fellowship in Gastroenterology at University of California Irvine. He started clinical practice in Anaheim in 1976 with all other doctors joining him thereafter. Dr. Riff is skilled in all endoscopic procedures and has done thousands of colonoscopies and upper gastrointestinal endoscopies. He is a compassionate and warm individual and an experienced physician in both Internal Medicine and Gastroenterology.

In-network insurances

  • Aetna
  • Anthem Blue Cross
  • Anthem Blue Cross Blue Shield

Specialties

  • Gastroenterologist
  • Internist

Practice names

Hospital affiliations

  • Placentia-Linda Hospital
  • Western Medical Center Santa Ana

Board certifications

  • American Board of Internal Medicine

Education and training

  • Medical School - Thomas Jefferson University, Doctor of Medicine
  • Thomas Jefferson University Hospital, Internship in Internal Medicine
  • University of California Irvine Medical Center, Fellowship in Gastroenterology
  • University of California Irvine Medical Center, Residency in Internal Medicine

Professional memberships

  • American College of Gastroenterology
  • American Medical Association
  • American Society for Gastrointestinal Endoscopy
  • Orange County Medical Associaton

Awards and publications

  • Served as Chairman of Internal Medicine
  • Served as Team Physician for Los Angeles Rams

Zocdoc awards

See you again
Rapid registration

Languages spoken

  • English

Provider's gender

Male

NPI number

1922004662

Office locations

Associated Gastroenterology Medical Group

2617 E Chapman Ave, Suite 302

Orange, CA 92869

Associated Gastroenterology Medical Group

1211 W La Palma Ave, Suite 306

Anaheim, CA 92801

Patient reviews
All reviews have been submitted by patients after seeing the provider. For more information, check out our Patient Knowledge Base.
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Based on 26 reviews

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He was a soft well spoken doctor and help me understand my specific needs.
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Dr. Riff is great. Won't beat around the bush and is very friendly.
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Quick, professional and to the point.
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Not my 1st choice for a PCP or GP. I'm sure he's fine in his field of expertise, but that's not why I came to see him. He is a skeptic when it comes to Lyme Disease diagnosis and I don'tthink he thinks too highly of Naturalpaths either. Looking forward to him helping me with other issues that need pharmaceuticals.
Less than 1 year ago
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Even though ZocDoc let me check in online, the physicians office made me fill out all of the same information again.
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The lobby needs to be bigger with more chairs for all of the people that are assigned appointed times to see the doctor.........its very crowded and noise with their talking/cells, etc. This is my biggest complaint.
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Very cool down-to-earth doctor. Great guy!
More than 1 year ago
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it was pain less every one was great
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Dr. Riff is an excellent physician. He takes his time and answers all questions.
More than 1 year ago
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Best Dr. I have seen in a long time.
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Dr. Riff was exactly luke what I read about him. He was patient, nice, caring, and truly acted like he was interested in me and helping me to get better. I was almost convinced that there wasn't any more doctors like him.
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Dr. Dennis Riff is the best of the best!!! Great with people, explains things in understandable terms. Highly intelligent with an exceptional sense of humor!
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Great,
More than 1 year ago
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Dr. Riff has always been a kind and patient doctor with me, for as long as I've seen him.
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Dr. Riff has a great personality! He is very knowledgeable & explains in language I can understand. Great Dr, highly recommend.
More than 1 year ago
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More than 1 year ago
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More than 1 year ago
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More than 1 year ago
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