Live
Read more

Clinic Type

Gastroenterology

Address

Fairfield, CA

Phone

(707) 646-3555

Email

feedback@northbay.org

Opening Hours

Not published — contact the clinic to confirm hours.

Services Offered

  • Gastroenterology
  • Advanced Health Practitioner, Gastroenterology

Team

  • Mounzer Al Samman, Gastroenterology — MD
  • Michael Krier, Gastroenterology — MD
  • Douglas Taylor, Gastroenterology, Interventional Endoscopy — MD
  • Charles Whang, Gastroenterology, Video — MD
  • Joel Ambrosio, Advanced Health Practitioner, Gastroenterology — PA

Insurance & Payment

  • Accepted Health Plans

Languages Spoken

Photos

What Patients Say

Overall sentiment across review platforms: positive

  • Healthgrades (Dr. Michael Krier): 5.0 out of 5 (53 ratings) (53 ratings)
  • Healthgrades (Dr. Rashid Iqbal): 3.9 out of 5 (31 ratings) (31 ratings)
  • NorthBay Health (Dr. Michael Krier): 4.9 out of 5 (170 ratings) (170 ratings)
  • NorthBay Health (Dr. Mounzer Al Samman): 4.8 out of 5 (155 ratings) (155 ratings)

Patients praise

  • High levels of patient satisfaction with clinical care
  • Doctors described as compassionate, thorough, and knowledgeable
  • Effective communication and explanation of conditions and treatments
  • Positive experiences with procedures such as colonoscopies and endoscopies

Common complaints

  • Some patient dissatisfaction with office staff and billing in isolated reviews

"I could not recommend this Dr. He really cares about his patients. Takes time and really follows through. I have had GI problems for years and finally have some hope for help."

Healthgrades (Dr. Michael Krier)

"Dr. Iqbal manages my Crohn's Disease. He is caring, compassionate, thorough, knowledgeable and experience. He explains symptoms, physical conditions, and explains possible treatment options. Excellent physician with a great office staff."

Healthgrades (Dr. Rashid Iqbal)

"After an initial consult, Dr. Krier performed an endoscopy and colonoscopy on me. No side effects. Felt great. Report was thorough and easily understood."

WebMD (Dr. Michael Krier)

Synthesized from public review platforms as of Jul 10, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 10, 2026.

More gastroenterology clinics in Fairfield

Fairfield, CA·Gastroenterology

VerifiedOnline booking
Fairfield, OH·Gastroenterology

Summary: - Ohio Gastroenterology and Liver Institute (Gastro Health - Cincinnati) is a private gastroenterology group founded in 1948, headquartered in Cincinnati, OH, with 4 offices in the U.S. - Services include general gastroenterology, colorectal care, liver care, endoscopy (including colonoscopy), ultrasound, gastroesophageal motility, clinical research, and pharmacy. - Key details: annual revenue about $6.17M, approximately 11 employees, monthly web traffic ~10.7k visits, global rank ~2.01M, top country United States. Employee reviews indicate modest satisfaction (2.1/5). - Contact: main phone numbers (513) 751-6667 and (513) 587-0511; general email eludwig@ohiogi.com. - Locations: Cincinnati area and Harrison, OH, with multiple office addresses listed. If you’re looking for a Cincinnati-area gastroenterology provider or endoscopy services under the Gastro Health umbrella, this page confirms the institute’s offerings, locations, and basic company details.

VerifiedOnline bookingSince 1948
Fairfield, CA·Gastroenterology

VerifiedOnline booking
Fairfield, OH·Gastroenterology

Verified
Fairfield, OH·Gastroenterology

Gastro Health is a network of board-certified gastroenterologists offering care for digestive and liver disorders. Headquartered in Miami, FL, the company operates 81 offices across the United States (including locations in Seattle, Orlando, Boca Raton, Liberty Township, and Fort Myers) and has a total workforce of about 622 employees. Founded in 2006, Gastro Health has grown to roughly $71.7 million in annual revenue and about $100 million in total funding across three prior rounds, with a significant presence in the U.S. and operations across 11 countries. If you’re searching for Gastro Health providers near Liberty (Liberty Township, Ohio) or Fairfield, note that the company lists multiple US offices but the provided locations include Liberty Township, OH, and several FL locations; no explicit Fairfield, OH location is shown in the excerpt.

VerifiedOnline bookingSince 2006

See all gastroenterology clinics in Fairfield

Comparing your options?

See other gastroenterology clinics in Fairfield, or search the full directory by insurance, ratings, and more.

More Gastroenterology Clinics