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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (14)

The overall average patient rating of Dr. Dennis Riff, Internist, Gastroenterologist is Excellent. Dr. Riff has been reviewed by 31 patients who have provided 14 comments. The rating is 4.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.5
Promptness 4.3
Courteous Staff 4.5
Accurate Diagnosis 4.3
Bedside Manner 4.4
Spends Time with Me 4.4
Follows Up After Visit 4.2

Specialties & Research

Dr. Dennis Riff, MD is board certified in Internal Medicine.

  • He has special expertise in 1 area:
  • Colonoscopy

Education & Awards

Dr. Riff graduated from Thomas Jefferson University, Philadelphia. He has 6 awards.

Patients' Choice 5th Anniversary Award (2015)
Patients' Choice Award (2011 - 2015)
Compassionate Doctor Award - 5 Year Honoree (2015)
Compassionate Doctor Recognition (2011 - 2015)
Top 10 Doctor - City (2014)
Orange, CA
On-Time Doctor Award (2015)


Dr. Riff has 9 hospital affiliations:

  • Anaheim Memorial Medical Center 
  • Chapman Medical Center 


  • Korean
  • Spanish

> > > > Dr. Dennis Riff, MD

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Additional Information
Dr. Dennis S Riff MD is a male Internist, has 41 years of experience and practices in Internal Medicine.
Where does Dr. Dennis S. Riff practice?
Dr. Dennis Riff has 1 office location.
Dr. Dennis Riff practices Internal Medicine near Orange, CA.
See Orange Internists.