Dr. John Dalena, MD
New Patients

Dr. John Dalena, MD


Gastroenterology | Male


John M. Dalena, MD, specializes in conditions and diseases of the esophagus, stomach, small intestine, large intestine, liver, gall bladder, and pancreas. Dr. Dalena also provides a wide range of gastrointestinal services, including cancer screening, nutritional support, therapeutic endoscopy, and colonoscopy.

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Dr. Dalena's Experience

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Board Certifications

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Conditions Treated

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Background Check

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Awards & Recognition

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Languages Spoken

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Memberships & Professional Affiliations

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Visiting Dr. Dalena

Dr. Dalena accepts 21 insurance carriers

Affiliated Hospitals

Hospital Quality
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Dr. Dalena's Reviews

Likelihood of recommending Dr. Dalena to family and friends
based on 146 total surveys (41 with reviews)
Dr. Dalena's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers Questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
  • Average wait time
    Under 10 minutes
Patient Reviews (41)
in Florham Park, NJ |
Very patient and informative.
in Florham Park, NJ |
Honest, great bedside manner so to speak, extremely knowledgeable.
in Florham Park, NJ |
Dalena is the best!
in Florham Park, NJ |
Thorough and good explanation .
in Florham Park, NJ |
in Florham Park, NJ |
Very professional.
in Florham Park, NJ |
Great dr .
in Florham Park, NJ |
Best doctor, I have been seeing Dr.Delena for past 20 years.
in Florham Park, NJ |
Very attentive and understanding. Always listens to what is going on.
in Florham Park, NJ |
Very thorough, very knowledgeable and staff is very courteous.
in Florham Park, NJ |
Top Notch care!!!
in Florham Park, NJ |
My visit was thorough.
in Florham Park, NJ |
in Florham Park, NJ |
Understanding, informative.
in Florham Park, NJ |
Excellent, outstanding.
in Florham Park, NJ |
Every thing was fine.
in Florham Park, NJ |
Thorough and caring dr. He answered all questions and was very personable.
in Florham Park, NJ |
in Hillsborough, NJ |
Dr. Dalena has been mine and my entire Family's GI Doctor for decades. Very professional and caring and Excellent doctor. I recommend him to everyone.
in Florham Park, NJ |
Excellent bedside manner, very professional and informative. I recommend him to everyone.
in Florham Park, NJ |
Thorough. Very patient oriented.
in Florham Park, NJ |
We love him!
in Florham Park, NJ |
Firm, but in a gentle caring way.
in Florham Park, NJ |
Very professional staff.
in Port Murray nj |
Outstanding balance between compassion and honesty. He is obviously well accomplished and knows his stuff. Not in an way an alarmist, he is also comprehensive a thorough. Without a doubt atop Doc in the NY, Nj area
in Florham Park, NJ |
Every one is great!
in Stroudsburg, PA |
Dr. Dalena is very knowledgeable; and he explained my medical details well. He listened carefully, seemed to reflect before answering, and appears to be highly conscientious. His, 'bedside manners' are also impeccable. All in all I'm very glad I found him. I travelled far in order to visit him at the Summit Medical Group; and, quite frankly, from now on I wouldn't think of going anywhere else for serious gastroenterological treatment.
in New York, NY |
Dr. Dalena was very attentive and reviewed the documents I presented. As always, very professional.
in Harrison, NJ |
Excellent .
in Florham Park, NJ |
Dr. Dalena is compassionate and extremely kind.
in Florham Park, NJ |
Excellent as always.
in Florham Park, NJ |
First appointment very welcoming and informative.
in Florham Park, NJ |
Always perfect with Dr Dalena.
in Florham Park, NJ |
Helpful and friendly - definitely a good overall experience.
in Florham Park, NJ |
Great visit with some good instructions.
in Florham Park, NJ |
Grateful to see the doctor who solved our problem today. Thank you!
in Florham Park, NJ |
Very professional, knowledgable , relaxed yet reassuring.
in Florham Park, NJ |
Dr Dalena is fabulous.
in Florham Park, NJ |
Dr. Dalena has great bedside manners.. I really love him and I am lucky to have had him for my dr.
in East Hanover, NJ |
I was recommended to Dr. Dalena by my Urologist. I made an appointment for my first colon screening. I actually met him for the 1st time right before my procedure. I felt at ease as soon as I spoke to him. After my procedure he came out and gave me my results and asked if I had any questions. There is no doubt that he will be my Gastro Dr. from this point on. The entire staff at the colonoscopy center locate at 195 Columbia Turnpike in Florham Park were excellent. Can't say enough about this pla
in Florham Park, NJ |
Have been seeing him for over 35 yrs. because of ulcerative colitis. He is extremely well qualified, kind and thorough. I have recommended him to several people, all very pleased and still with him.
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Dr. Dalena says...

John M. Dalena, MD, specializes in conditions and diseases of the esophagus, stomach, small intestine, large intestine, liver, gall bladder, and pancreas. Dr. Dalena also provides a wide range of gastrointestinal services, including cancer screening, nutritional support, therapeutic endoscopy, and colonoscopy.

Dr. Dalena says...

In addition to his position at Summit Medical Group, Dr. Dalena is Director of Endoscopy at Morristown Surgical Center and Chairman in the Department of Gastroenterology at Morristown Medical Center in Morristown, New Jersey. He is an attending physician in the Department of Internal Medicine at Morristown Medical Center, Florham Park Endoscopy Center, Hanover Endoscopy Center, and Morristown Surgical Center. Dr. Dalena has practiced privately with Atlantic Gastroenterology in Cedar Knolls, Florham Park, Morristown, and Whippany, New Jersey.

Dr. Dalena has earned the Morristown Medical Center Physician of the Year Award. He also earned the University of Medicine and Dentistry Fellowship Research First Prize Award and American College of Physicians - New Jersey Chapter Laureate Award for Outstanding Achievement in Medicine. He has been featured multiple times in New Jersey Monthly and Castle Connolly  "Top Doctors" and "Top Doctors in the New York Metro Area" listings. Dr. Dalena is one of few physicians nationwide to earn Castle Connolly "Top Doctor" listings for more than 10 consecutive years. His "Top Doctors" listings are reprinted in Inside Jersey and US News and World Report.

Dr. Dalena's experience matches your search based on the following criteria:

  •  Based on total number of patients treated over the last 12 months
  •  Specializes in Gastroenterology
  •  Board certified in Gastroenterology and Internal Medicine
  •  No malpractice claims found
  •  No sanctions found
  •  No board actions found

Awards & Recognition

  • Awards & Honors
    • Healthgrades Honor Roll
    What is a recognized doctor
  • Media & Publications

    Dr. Dalena has no media or publications listed.

Background Check

  • 0
    Malpractice Claims

    No malpractice history found for New Jersey.

    What is medical malpractice
  • 0

    No sanctions history found for the years that Healthgrades collects data.

    What is a sanction or disciplinary action
  • 0
    Board Actions

    No board actions found for the years that Healthgrades collects data.

    What are board actions

Board Certifications

Why It Matters: Dr. Dalena's Board Certifications

Board certification should be one of your top considerations when choosing a doctor. Board certification is an official recognition given to doctors who have met specific requirements set by national medical specialty boards in the... More

  • Gastroenterology
  • Internal Medicine

Conditions Treated

  • Abdominal Disorders
  • Abdominal Pain
  • Anal or Rectal Pain
  • Anemia
  • Autoimmune Diseases
  • Barrett's Esophagus
  • Benign Neoplasm of the Digestive System
  • Benign Tumor
  • Biliary Atresia
  • Blood Disorders
  • Cancer
  • Cholecystitis and Gallstones
  • Cirrhosis
  • Colorectal Cancer
  • Constipation
  • Crohn's Disease
  • Diaphragmatic and-or Hiatal Hernia
  • Diarrhea
  • Diverticulitis, Intestinal
  • Diverticulosis, Intestinal
  • Duodenal Ulcer
  • Duodenitis
  • Dysentery
  • Dysphagia
  • Enteritis
  • Esophageal Achalasia and Cardiospasm
  • Esophageal Diseases
  • Esophageal Ulcer
  • Esophageal Varices
  • Esophagitis
  • Gas-Bloat Syndrome
  • Gastric Ulcer
  • Gastritis
  • Gastroesophageal Reflux Disease (GERD)
  • Gastrointestinal Bleeding
  • Gastrointestinal Diseases
  • Gastrointestinal Malabsorption
  • Gastrojejunal Ulcer
  • Gastroparesis
  • Heartburn
  • Hemochromatosis
  • Hemorrhoids
  • Hepatitis A
  • Hepatitis B - Immune Response
  • Hepatitis C
  • Hernia
  • Ileus
  • Indigestion
  • Inflammatory Bowel Disease
  • Intestinal Obstruction
  • Irritable Bowel Syndrome
  • Lactose Intolerance
  • Malnutrition
  • Nausea
  • Non-Alcoholic Fatty Liver Disease
  • Non-Neonatal Jaundice
  • Noninfectious Gastroenteritis and Colitis
  • Pancreatitis
  • Peptic Ulcer
  • Pyloric Stenosis
  • Reflux Esophagitis
  • Stomach Cancer
  • Stomach Diseases
  • Stomach and Small Intestine Cancer
  • Ulcer
  • Ulcerative Colitis
  • Unexplained Weight Loss
  • Viral Hepatitis
  • Vomiting Disorders


  • Medical School
    UMDNJ-- New Jersey Medical School

    Graduated in 1985

  • Internship Hospital
    Mount Sinai Medical Center
  • Residency Hospital
    Mount Sinai Medical Center
  • Fellowship Hospital
    University of Medicine And Dentistry of New Jersey

Languages Spoken

  • English
  • Italian

Memberships &
Professional Affiliations

Dr. Dalena does not have any memberships or affiliations listed. If you are Dr. Dalena and would like to add memberships or affiliations, please update your free profile.


  • Gastroenterology

Procedures Performed

  • Colonoscopy With Polypectomy
  • Colonoscopy, Proctosigmoidoscopy, and Sigmoidoscopy
  • Endoscopy (Esophagus, Stomach, Small Intestine)
  • Gastroenterology Procedures
  • Liver Biopsy
  • Manometry