Public provider listing

Associated Gastroenterology Medical Group

4.5(30)

Associated Gastroenterology Medical Group is a Gastroenterologist practice in Tustin, CA. Rated 4.5 from 30 public reviews. Phone and website are listed.

Address

12791 Newport Ave #208, Tustin, CA 92780
Tustin, CA 92780

Public hours

Listed hours

As published
Monday
8:45AM–5PM
Tuesday
8:45AM–5PM
Wednesday
8:45AM–5PM
Thursday
8:45AM–5PM
Friday
8:45AM–1PM
Saturday
Closed
Sunday
Closed
Verified listing details

Credentials, affiliations, and coverage

Checked Aug 12, 2026

Sources

Federal data is attributed to its source and does not imply CMS endorsement.

Public media

Newest photos

Up to 10

No public photos are available for this listing.

Public reviews

Newest reviews

Up to 10

Michelle Johnson

5.0

The office staff is very helpful and Dr Riff is very thorough and caring and has a great bedside manner

Linda

5.0

Dr. Riff and office staff are extremely kind and helpful. They solved something I've needed for awhile. Thank You so much 🧑‍⚕️🤙

Jean Marie

5.0

I am so glad I discovered this practice and I think Dr. Brian Riff is the absolute best. He was super nice, very personable and extremely knowledgeable. I feel I’m in great hands and on the right track with my digestive issues now. A+++

Deborah Louis

5.0

I been Regular visit with Doctor Brian Riff He is very professional throughout managing my Gerd (acid reflux) and Barrett’s surveillance. He answers my questions decides what’s best and cares about my concerns. I undergo Endoscopy procedures every 3 years and I been in good hands. I wouldn’t fully trust in anyone else to perform this kind of delicate test.

Shailesh Patel

5.0

No written review was provided.

Marites Hergesheimer

5.0

No written review was provided.

Julie W

5.0

Dr Brian Riff is great! Thorough, kind, honest and knowledgeable. I trust him 100% and will follow his plan. I am in remission pretty much after 30+ yrs of UC. Living a life I didn’t think would ever be.

Pilar Najera

5.0

Hey! Just wanted to quickly share how amazing my visit was Monday Seriously, from the second I walked in, the front desk team was absolutely lovely and so on top of things – they made checking in a breeze. Then, my appointment with Dr. Riff was just fantastic. He really went above and beyond! I genuinely appreciated how much time he took to patiently explain every single detail, walking me through my diagnosis and giving me a super clear picture of the treatment plan ahead. It made such a huge difference to feel so informed and comfortable about everything. What a relief to be in such capable hands! Sent from Yahoo Mail for iPhone

Griffin

5.0

Easily scheduled appointments. A very nice facility. Polite staff. Great doctor too 🏁

Steve Yellon

5.0

AGMG and all the people took such good care of me! Highly recommended but only if you want great people, smart doctors. Great reception crew!

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