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  • Gastroenterology
Accepting new patients

Appointments: Call 973-701-8277


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396 Main Street Gastroenterology

396 Main Street
Chatham, NJ 07928
United States

Clinical Expertise

  • Abdominal pain and bloating
  • Achalasia
  • Barrett’s Esophagus and ablation of Barrett’s
  • C. difficile infection
  • Celiac disease
  • Chronic constipation
  • Chronic diarrhea
  • Colon cancer
  • Colonoscopy
  • Difficulty swallowing
  • Diseases of the Pancreas and Bile Ducts
  • Disorders of the Esophagus
  • Diverticulitis
  • Dyspepsia
  • Eosinophilic esophagitis
  • Esophageal motility disorders
  • Esophageal strictures
  • Family history of colon cancer and other cancers
  • Gastroesophageal reflux and heartburn
  • Gastrointestinal bleeding
  • General Gastroenterology
  • Genetic syndromes with risk of colon cancer
  • H. Pylori infection
  • IBD
  • Infections of the gastrointestinal tract
  • Irritable Bowel Syndrome and Other Conditions
  • Liver disease
  • Multidisciplinary treatment of colon cancer
  • Nausea and Vomiting
  • Peptic ulcer disease
  • Removal of colon polyps
  • Screening for colon polyps and prevention of cancer
  • Screening for esophageal cancer
  • Small intestinal bacterial overgrowth
  • Zenker’s Diverticulum

Accepted Insurances

Always check with your health insurance carrier before scheduling any type of service. You can learn the details of your individual health insurance plan, including the amount of your copay, deductible, and coinsurance by visiting your health insurance company's website or by calling their customer service department. Click here to review our list of accepted insurance plans.

Training and Education

Board Certification

  • American Board Of Internal Medicine

Medical School

  • St. George's University School of Medicine, Grenada, West Indies


  • Franklin & Marshall College, Lancaster, PA


  • Internal Medicine, Muhlenberg Regional Medical Center, Plainfield, NJ


  • Internal Medicine, University of Medicine & Dentistry of New Jersey, Newark, NJ


  • Digestive Diseases, University of Medicine & Dentistry of New Jersey, Newark, NJ

About Me

John N. Franzese is part of Summit Health’s Gastroenterology team. Dr. Franzese has extensive training in general adult gastroenterology and is experienced in the diagnosis and treatment of a variety of digestive disorders in both men and women.

Prior to joining Summit Health, Dr. Franzese was in private practice in Chatham for 25 years. Medicine has always been his calling with his decision to serve being heavily based on life experience and his strong belief in the health care mission. He says, “I rely on my knowledge and empathy to serve as the foundation for patient care and make every effort to gain thorough understanding of my patients’ clinical issues so I can guide them to better health and overall well-being.”

Dr. Franzese has been selected as a NJ Monthly Top Doc since 2006 and received a Patient’s Choice Award in 2013. He currently serves on the Medical Quality Review Committee and the Transfusion Committee at Overlook Medical Center. He is a member of the American College of Gastroenterology, the Union County Medical Society, the Medical Society of New Jersey, and the American Gastroenterology Association.

Outside of the field, Dr. Franzese enjoys spending quality time with his family and staying physically active. He is especially passionate about cystic fibrosis advances and fundraising, as well as serving his community and church.


Hospital Affiliations

  • Overlook Medical Center

Awards and Honors

  • Top Doctors 2020