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Best Gastroenterologists in Ontario

Written by Andrew Le, MD

Updated December 24, 2024

Introduction to Gastroenterology in Ontario, California

Definition of gastroenterology

Gastroenterology is a medical specialty that focuses on the digestive system and its disorders. Gastroenterologists are physicians who specialize in diagnosing and treating conditions affecting the gastrointestinal (GI) tract, which includes the esophagus, stomach, small intestine, colon, liver, pancreas, and gallbladder.

Common conditions treated by gastroenterologists include inflammatory bowel diseases (such as Crohn's disease and ulcerative colitis), gastroesophageal reflux disease (GERD), peptic ulcers, colorectal cancer, hepatitis, and various functional GI disorders.

Importance of gastroenterology in healthcare

Gastroenterology plays a significant role in healthcare by addressing issues that directly affect a person's quality of life and overall health. Proper digestive function is essential for nutrient absorption, immune system support, and maintaining a healthy body weight. By diagnosing and treating GI disorders, gastroenterologists help patients alleviate symptoms, prevent complications, and improve their overall well-being.

Gastrointestinal issues are remarkably common in the general population. According to the National Institutes of Health, digestive diseases affect 60 to 70 million Americans annually. In Ontario, California, and the surrounding areas, access to skilled gastroenterologists is important for addressing these prevalent health concerns and ensuring timely diagnosis and treatment of digestive disorders.


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List of Gastroenterologists in Ontario

BP

Dr. Bhavesh Patel

5.0

Ontario, CA

Sex

Male

Languages

English

Phone

(909) 303-2260

American Board of Internal Medicine

SOUTH GUJARAT UNIVERSITY / GOVERNMENT MEDICAL COLLEGE (Medical School, 2007)

English

San Antonio Regional Hospital

Gastroenterology

Internal Medicine

TO

Dr. Tommy Oei

5.0

Ontario, CA

Sex

Male

Languages

English

Phone

(909) 427-3910

American Board of Internal Medicine

New York University Grossman School of Medicine (Medical School, 1997)

English

Kaiser Permanente Fontana Medical Center

Gastroenterology

DS

Dr. Daniel Seid

5.0

Ontario, CA

Sex

Male

Languages

English

Phone

(909) 427-5231

American Board of Internal Medicine

VA Hospital (Residency Hospital, 1990)

UC-Irvine (Fellowship Hospital, 1990)

Saint Louis University School of Medicine (Medical School, 1987)

English

Kaiser Permanente Fontana Medical Center

Gastroenterology

NP

Dr. Nehali Patel

5.0

Ontario, CA

Sex

Female

Languages

English

Phone

(909) 427-5000

English

Kaiser Permanente Fontana Medical Center

Gastroenterology

TK

Dr. Timothy Kuo

5.0

Ontario, CA

Sex

Male

Languages

English, Mandarin

American Board of Internal Medicine

Boston University (Medical School, 1999)

English

Mandarin

Kaiser Permanente Fontana Medical Center

Gastroenterology

Dr. David Davtyan

Dr. David Davtyan

4.6

Ontario, CA

Sex

Male

Languages

English, Armenian, French, Romanian, Russian, Spanish

Phone

(310) 652-1777

American Board of Surgery

John Wayne Cancer Institute: Fellowship in Surgical Oncology (Fellowship Hospital, 1997)

John Wayne Cancer Institute: Fellowship in Surgical Oncology|John Wayne Cancer Institute: National Institute of Health Clinical and Research Fellowship in Surgical Oncology|UCLA Department of Surgery: American Cancer Society Clinical and Research Fel (Fellowship Hospital, 1997)

University Of Texas Houston, Department of Surgery. M.D. Anderson Cancer Center: General Surgery Residency (Residency Hospital, 1996)

John Wayne Cancer Institute: National Institute of Health Clinical and Research Fellowship in Surgical Oncology (Fellowship Hospital, 1992)

UCLA Department of Surgery: American Cancer Society Clinical and Research Fellowship in Surgical Oncology (Fellowship Hospital, 1991)

Memorial Hermann Texas Medical Center (Internship Hospital, 1990)

University of California, Los Angeles David Geffen School of Medicine (Medical School, 1989)

Institute of Medicine Bucuresti (Undergraduate School, 1985)

English

Armenian

French

Romanian

Russian

Spanish

Ronald Reagan UCLA Medical Center

Cedars-Sinai Medical Center

Santa Monica UCLA Medical Center and Orthopaedic Hospital

Bariatric Surgery

Gastroenterology

Breast Surgical Oncology

MT

Dr. Maher Tama

4.2

Ontario, CA

Sex

Male

Languages

English, Arabic

Phone

(909) 398-1550

American Board of Internal Medicine

Damascus University Faculty of Medicine (Medical School)

English

Arabic

Enloe Medical Center

Loma Linda University Medical Center

Oroville Hospital

Gastroenterology

MS

Dr. Mohammad Shakfeh

4.1

Ontario, CA

Sex

Male

Languages

English, Arabic, Spanish

Phone

(909) 606-4860

American Board of Internal Medicine

Kaiser Permanente Los Angeles Medical Center (Fellowship Hospital, 1997)

University of Pennsylvania Perelman School of Medicine (Fellowship Hospital, 1995)

Hurley Hosp-Mich State University (Residency Hospital, 1988)

Hurley Hospital Mich State University (Residency Hospital, 1988)

University Of Aleppo, Faculty Of Medicine (Medical School, 1980)

English

Arabic

Spanish

Montclair Hospital Medical Center

Chino Valley Medical Center

Gastroenterology

Hepatology

Dr. Shabana Pasha

Dr. Shabana Pasha

4.0

Ontario, CA

Sex

Female

Languages

English

Phone

(480) 933-8137

American Board of Internal Medicine

Mayo Clinic (Medical School, 2007)

English

Mayo Clinic Hospital

Gastroenterology

Hepatology

Dr. Andrea Tieng

Dr. Andrea Tieng

3.8

Ontario, CA

Sex

Female

Languages

English, Cantonese, Chamorro, Spanish

Phone

(909) 255-7200

Private Practice - Group/Partnership ()

Long Island Jewish Med Ctr-Albert Einstein College of Medicine (Fellowship Hospital, 2009)

State University of New York Downstate Health Sciences University College of Medicine (Medical School, 2003)

Ba/MD Program At City University Of New York At Brooklyn (Undergraduate School, 1999)

English

Cantonese

Chamorro

Spanish

San Antonio Regional Hospital

Gastroenterology

Hepatology

Internal Medicine

MN

Dr. Mysore Nagaraja

3.6

Ontario, CA

Sex

Male

Languages

English, Spanish

Phone

(818) 363-3105

American Board of Internal Medicine

Kempegowda Institute of Medical Sciences (Medical School, 1970)

English

Spanish

Providence Holy Cross Medical Center

Pomona Valley Hospital Medical Center

Gastroenterology

Internal Medicine

JK

Dr. John Kim

3.5

Ontario, CA

Sex

Male

Languages

English, Korean

Phone

(909) 981-8905

English

Korean

Cedars-Sinai Medical Center

Loma Linda University Medical Center

Loma Linda University Medical Center-Murrieta

Internal Medicine

Gastroenterology

Dr. Neena Abraham

Dr. Neena Abraham

3.5

Ontario, CA

Sex

Female

Languages

English

Phone

(480) 870-7240

McGill University Health Center|McGill U/Montreal General Hospital (Fellowship Hospital, 2000)

University Alberta (Residency Hospital, 1997)

English

Mayo Clinic Hospital

Gastroenterology

Hepatology

Dr. Chuang-Ti Hung

Dr. Chuang-Ti Hung

3.3

Ontario, CA

Sex

Male

Languages

English, Chinese, Mandarin, Minnan, Spanish

Phone

(909) 985-2709

American Board of Internal Medicine

Loma Linda University Medical Center (Fellowship Hospital, 1984)

Loma Linda University Medical Center (Residency Hospital, 1982)

BRONX LEBANON HOSPITAL MEDICAL CENTER (Residency Hospital, 1981)

Bronx-Lebanon Hospital Medical Center (Residency Hospital, 1981)

Wyckoff Heights Hospital (Internship Hospital, 1979)

Wyckoff Heights Medical Center (Internship Hospital, 1979)

Chung-Shan Medical and Dental College (Undergraduate School, 1975)

Chung-Shan Medical & Dental College (Medical School, 1975)

English

Chinese

Mandarin

Minnan

Spanish

San Antonio Regional Hospital

Gastroenterology

Internal Medicine

Dr. Nischita Merla

Dr. Nischita Merla

3.3

Ontario, CA

Sex

Female

Languages

English, Hindi, Punjabi, Spanish, Telugu, Urdu

Phone

(909) 833-7556

American Board of Internal Medicine

University of Texas Medical Branch (Fellowship Hospital, 2010)

Guntur Medical College, Ntr University Of Health Sciences (Medical School, 1998)

English

Hindi

Punjabi

Spanish

Telugu

Urdu

San Antonio Regional Hospital

Pomona Valley Hospital Medical Center

Gastroenterology

Internal Medicine

BA

Dr. Basim Abdelkarim

3.1

Ontario, CA

Sex

Male

Languages

English, Arabic

Phone

(909) 579-1500

American Board of Internal Medicine

University of California Irvine Medical Center (Residency Hospital)

University of California, Irvine School of Medicine (Medical School, 1999)

English

Arabic

Casa Colina Hospital

San Antonio Regional Hospital

Gastroenterology

MH

Dr. Muhammad Hammami

3.0

Ontario, CA

Sex

Male

Languages

English

Phone

(909) 606-4860

American Board of Internal Medicine

Damascus University Faculty of Medicine (Medical School, 2009)

English

Montclair Hospital Medical Center

Gastroenterology

Internal Medicine

JY

Dr. Janet Yang

3.0

Ontario, CA

Sex

Female

Languages

English

Phone

(888) 750-0036

NEW YORK Medical College (Medical School)

English

Kaiser Permanente Fontana Medical Center

Gastroenterology

PS

Dr. Paurush Shah

3.0

Ontario, CA

Sex

Male

Languages

English

Phone

(562) 869-1070

American Board of Internal Medicine

English

Gastroenterology

US

Dr. Umesh Shah

2.9

Ontario, CA

Sex

Male

Languages

English, Gujarati, Hindi, Spanish

Phone

(909) 464-8600

American Board of Internal Medicine

Ml King Jr General Hospital (Fellowship Hospital, 1982)

Mlk Jr Hospital (Residency Hospital, 1980)

Rosalind Franklin University Chicago Medical School (Internship Hospital, 1978)

Medical College Baroda, Maharaja Sayajirao University Of Baroda (Medical School, 1977)

English

Gujarati

Hindi

Spanish

Montclair Hospital Medical Center

Chino Valley Medical Center

Gastroenterology

DR

Dr. Dwaraknath Reddy

2.0

Ontario, CA

Sex

Male

Languages

English, Hindi, Spanish

Phone

(909) 629-5540

SRI KRISHNADEVARAYA UNIVERSITY / GOVERNMENT MEDICAL COLLEGE (Medical School, 1972)

English

Hindi

Spanish

Pomona Valley Hospital Medical Center

Gastroenterology

ZS

Dr. Zhigang Song

2.0

Ontario, CA

Sex

Male

Languages

English

Phone

(909) 724-5000

American Board of Internal Medicine

Shandong Medical College (Medical School)

English

Kaiser Permanente Fontana Medical Center

Gastroenterology

Dr. Yeong Sheu

Dr. Yeong Sheu

1.9

Ontario, CA

Sex

Male

Languages

English, Chinese

Phone

(818) 845-1854

American Board of Internal Medicine

National Taiwan University (Medical School, 1986)

English

Chinese

Providence Saint Joseph Medical Center

Gastroenterology

Internal Medicine

Dr. Laurence Miller

Dr. Laurence Miller

1.0

Ontario, CA

Sex

Male

Languages

English

Phone

(480) 933-8137

American Board of Internal Medicine

FAIRFIELD UNIVERSITY / GRADUATE SCHOOL OF EDUCATION AND ALLIED PROFESSIONS (Medical School, 1979)

Mayo Clinic-Rochester (Fellowship Hospital, 1979)

Mayo Clinic-Rochester (Residency Hospital, 1976)

Thomas Jefferson University Hospital (Internship Hospital, 1974)

English

Mayo Clinic Hospital

Gastroenterology

Hepatology

JY

Dr. Joseph Yeh

N/A

Ontario, CA

Sex

Male

Languages

English

Phone

(833) 574-2273

American Board of Internal Medicine

University of Maryland School of Medicine (Medical School, 2008)

English

Kaiser Permanente Fontana Medical Center

Kaiser Permanente Baldwin Park Medical Center

Gastroenterology

AH

Dr. Alexander Han

N/A

Ontario, CA

Sex

Male

Languages

English

Phone

(888) 750-0036

USC University Hospital (Fellowship Hospital, 2008)

Montefiore Medical Center - Moses Division (Internship Hospital, 2006)

Northwestern University Feinberg School of Medicine (Medical School, 2005)

English

Kaiser Permanente Fontana Medical Center

Internal Medicine

Gastroenterology

JW

Jeremy Wang

N/A

Ontario, CA

Sex

Male

Languages

English

Phone

(833) 574-2273

English

Kaiser Permanente Fontana Medical Center

Gastroenterology

Choosing a Gastroenterologist in Ontario

Factors to consider when selecting a doctor

Board certification and qualifications

  • Review American Board of Internal Medicine certifications
  • Consider additional specialized training or fellowships

Experience and specializations

  • Evaluate years of practice and areas of expertise
  • Look for doctors with experience in specific gastrointestinal conditions

Hospital affiliations

  • Check affiliations with reputable hospitals like San Antonio Regional Hospital
  • Consider proximity of affiliated hospitals to your location

Patient reviews and ratings

  • Examine star ratings and number of reviews on platforms like Healthgrades
  • Read patient testimonials for insights into doctor-patient relationships

Resources for finding gastroenterologists in Ontario

Online directories and review platforms

  • Utilize Healthgrades and similar websites for comprehensive doctor profiles
  • Compare information across multiple platforms for a balanced view

Referrals from primary care physicians

  • Consult your primary care doctor for personalized recommendations
  • Discuss your specific gastrointestinal concerns to get targeted referrals

Local medical societies and associations

  • Contact California Medical Association for gastroenterology specialists
  • Explore resources provided by American College of Gastroenterology

Top-Rated Gastroenterologists in Ontario

Dr. Bhavesh Patel

Education and Certifications

  • Medical School: SOUTH GUJARAT UNIVERSITY / GOVERNMENT MEDICAL COLLEGE (2007)
  • Board Certified by American Board of Internal Medicine

Hospital Affiliations

  • San Antonio Regional Hospital, Upland, CA

Patient Ratings and Reviews

  • 5.0 star rating based on 2 reviews
  • Specializes in Gastroenterology and Internal Medicine

Dr. Timothy Kuo

Education and Certifications

  • Medical School: Boston University (1999)
  • Board Certified by American Board of Internal Medicine

Hospital Affiliations

  • Kaiser Permanente Fontana Medical Center, Fontana, CA

Patient Ratings and Reviews

  • 5.0 star rating based on 2 reviews
  • Specializes in Gastroenterology

Dr. Tommy Oei

Education and Certifications

  • Medical School: New York University Grossman School of Medicine (1997)
  • Board Certified by American Board of Internal Medicine

Hospital Affiliations

  • Kaiser Permanente Fontana Medical Center, Fontana, CA

Patient Ratings and Reviews

  • 5.0 star rating based on 1 review
  • Specializes in Gastroenterology

Additional Considerations for Selecting a Gastroenterologist

Language preferences

Multilingual doctors in Ontario

  • Dr. Mohammad Shakfeh: English, Arabic, Spanish
  • Dr. Nischita Merla: English, Hindi, Punjabi, Spanish, Telugu, Urdu
  • Dr. Chuang-Ti Hung: English, Chinese, Mandarin, Minnan, Spanish

Benefits of language-matched care

  • Improved patient-doctor communication
  • Better understanding of treatment plans
  • Enhanced cultural competence in care

Specialized treatments and expertise

Gastroenterologists with additional specializations

  • Dr. Mohammad Shakfeh: Gastroenterology and Hepatology
  • Dr. Andrea Tieng: Gastroenterology, Hepatology, and Internal Medicine
  • Dr. David Davtyan: Gastroenterology and Bariatric Surgery

Importance of specialized expertise

  • Tailored treatment for complex digestive issues
  • Access to advanced diagnostic and treatment techniques
  • Potential for multidisciplinary approach to care

Insurance and accessibility

Verifying insurance coverage

  • Checking in-network providers
  • Understanding co-pays and deductibles for specialist care
  • Inquiring about coverage for specific procedures

Considering location and availability

  • Proximity to patient's residence or workplace
  • Office hours and appointment availability
  • Telemedicine options for consultations