What patients are saying
Overall rating
4.80
Average wait time
4.84
Bedside manner
4.86
“The office was very kind and patient with my description of issues that were occurring. They offered rapid investigations practices so we can come up with a solution. ”
michelle M.December 27, 2025
“He is a kind and very understanding doctor, optimistic; his secretaries are also very charming and attentive. A very clean and tidy place. Att Lesbia H. ”
Lesbia H.December 22, 2025
About Dr. Mark Coronel
**DR. CORONEL TREATS PATIENTS 16 YEARS OLD AND UP.**
Dr. Coronel graduated magna cum laude from Yeshiva University with a BA degree in biology. He earned his Doctor of Medicine from Albert Einstein College of Medicine of Yeshiva University in Bronx, NY. He completed his internship and residency training in internal medicine at Long Island Jewish Medical Center, part of the Albert Einstein program in New Hyde Park. This was followed by gastroenterology and hepatology training within the North Shore-Long Island Jewish health system and a transplant hepatology rotation at Montefiore Medical Center.
Dr. Coronel has been involved for several years in clinical research in gastroenterology and hepatology. He has authored and presented numerous abstracts, posters, and oral presentations at national meetings. In 2006, he was honored by the American College of Gastroenterology with the Governors Award for Excellence in Clinical Research and Best Scientific Paper. In 2010, he was invited to participate in the Curatio National Inflammatory Bowel Disease mentorship program.
Dr. Coronel is an attending physician at Peconic Bay Medical Center, where he currently serves as director of endoscopy. He is also actively involved in teaching medical students, interns, and residents in family medicine and surgery. His primary interests include colon cancer screening, pancreatic disease, gastroesophageal reflux disease (GERD) management, inflammatory bowel disease, and biliary tract disease, utilizing ERCP, capsule endoscopy, and small bowel enteroscopy procedures.
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In-network insurances
99% of patients have successfully booked with these insurances
Aetna
BlueCross BlueShield
Cigna
Emblem Health
Medicare
UnitedHealthcare
UnitedHealthcare Oxford
Areas of expertise
This doctor's experience enhances their expertise in similar cases. Below are the conditions or surgeries they treat most frequently.
Colonoscopy
Chronic Inflammatory Bowel Disease (IBD)
Gastroenteritis
Diverticulosis (outpouchings) of intestine
Irritable Bowel Syndrome (IBS)
Acute stomach inflammation/infection
Colonoscopy
Chronic Inflammatory Bowel Disease (IBD)
Gastroenteritis
Diverticulosis (outpouchings) of intestine
Office locations
Dr. Mark Coronel, MD also offers online video visits for patients
East End Gastroenterology & Hepatology (1 of 2)
715 Roanoke Ave, Bldg B, Riverhead, NY 11901
East End Gastroenterology & Hepatology (2 of 2)
287 Wading River Rd, Unit 2, Manorville, NY 11949
1 of 2
Education and background
Practice names
Hospital affiliations
- Peconic Bay Medical Center
Board certifications
- American Board of Internal Medicine
- Gastroenterology (Internal Medicine)
Education and training
- Medical School - Albert Einstein College of Medicine of Yeshiva University, Doctor of Medicine
- Long Island Jewish Medical Center, Residency in Internal Medicine
- Yeshiva University (Bachelor’s)
Awards and publications
- Our facility is accredited and recognized by AAAASF and ASGE
Languages spoken
- English
Provider's gender
Male
NPI number
1346416963
Patient reviews
All reviews have been submitted by patients after interacting with the practice.
Overall rating
4.80
Wait time
4.84
Bedside manner
4.86
Your trust is our top concern, so providers can't pay to alter or remove reviews. We also don't publish reviews that contain any private patient health information. Learn more here
254 reviews
Most relevant
Dr Coronel is a friendly knowledgeable provider. His office is clean, organized and the staff is knowledgeable and welcoming
November 11, 2025Susan L.Verified patient
very nice office, very professional and clean, answers all questions, and staff is wonderful!!!!
December 10, 2025Denise D.Verified patient
I am a patient of Dr Coronel. And I brought my husband here for his illness. Yes I would recommend him very highly.
February 24, 2025Mark M.Verified patient
Perfect bedside manner. Comfortable office. The staff was easy to deal with. Highest recommendation.
May 19, 2025Initials hidden
What a great experience!! Dr. Coronel is a wonderful doctor. He was kind, compassionate snd attentive. He is now my doctor.
March 19, 2024Karen E.Verified patient
Dr. Coronel was extremely nice. He was very thorough and listened to what I had to say. He gave me advice and was helpful.
February 5, 2019Peter E.Verified patient
Great experience doctor listened and answered all my questions and concerns
April 30, 2025Jacqueline R.Verified patient
Very prompt with Appointment. No waiting time. Very professional office and friendly staff. I highly recommend him.
September 1, 2016Initials hidden
Everything went well, and the doctor was very professional and very nice. No waiting time. Very friendly staff.
More than 1 year agoRobert S.Verified patient
I thought the Dr was very good.
He explained things,
And
Was very nice
And
Very knowledgeable.
December 1, 2023Ann D.Verified patient
Dr. Coronel had excellent bedside manner. He made me feel very comfortable. I highly recommend him.
July 28, 2020Isabelle R.Verified patient
I love this doctor. Been going to him for a few years now. Highly recommend
August 19, 2024Christine C.Verified patient
The doctor was thoughtful, interested and extremely informative. It was a most pleasant visit.
May 30, 2022Devy F.Verified patient
He is just a great guy who doesnt think he is better than you. He makes you feel safe.
August 14, 2023Randy P.Verified patient
Very friendly and took care of what I needed the appointment for.
February 10, 2025Maryann F.Verified patient
Great staff and Dr Coronel was very welcoming being a 1st time visitor to a Gastroenterologist.
More than 1 year agoKevin L.Verified patient
Very friendly and knowledgeable.
Staff was also excellent and took care of me right away.
March 21, 2022Fernando C.Verified patient
I was so impressed with my whole experience. I am recommending to my friends and family!
September 23, 2021Debra S.Verified patient
Clean, comfortable office - efficient staff. Dr. on time, respectful and listened well.
December 15, 2021Collette C.Verified patient
Felt very comfortable with him and liked his manner and advice
September 6, 2024Margaret S.Verified patient
He was very professional and very nice. Attended to my needs. Would highly recommend
December 10, 2020Christine C.Verified patient
Very professional .
Staff was pleasant and Dr.Cornel was very nice.
Thanks so much.
More than 1 year agoWayne M.Verified patient
Friendly staff !
Professional health care provider !
December 11, 2024Jhon S.Verified patient
The staff was very friendly, the office was clean and the Doctor was great.
February 24, 2022Azad A.Verified patient
I was very satisfied with my visit and I would see Dr. Coronell again
May 23, 2023Vita G.Verified patient
Very nice doctor... right on time and wants to help solve health problems.
More than 1 year agoInitials hidden
great MD.... no nonsense --- no nurses, staff etc..just the good doc
March 19, 2021Duane R.Verified patient
Was put at ease, the doctor was extremely helpful & reassuring.
More than 1 year agoMM
Nice Dr. and staff. On-line booking was easy and accurate.
August 3, 2021Richard M.Verified patient
Very thorough and nice , spoke his concerns and made a plan
September 25, 2017Elizabeth D.Verified patient
Insightful, concerned and quick to schedule procedures!
September 20, 2016William S.Verified patient
Friendly environment, short wait and great doctor
May 31, 2021Sarah K.Verified patient
He was pleasant and attentive as well as thorough.
December 11, 2017Tina S.Verified patient
Doctor was so friendly and professional!
March 12, 2026Colin F.Verified patient
The office was very kind and patient with my description of issues that were occurring. They offered rapid investigations practices so we can come up with a solution.
December 27, 2025michelle M.Verified patient
He is a kind and very understanding doctor, optimistic; his secretaries are also very charming and attentive. A very clean and tidy place. Att Lesbia H.
December 22, 2025Lesbia H.Verified patient
If you need a gastroenterologist, I recommend East End Gastroenterology & Hepatology. Mark Coronel, M.D. and his staff are wonderful and professional in every way. The office is conveniently located, nice and clean, and comfortable. After signing in, I was immediately led to an examination room - no waiting! My visit was great, and I highly recommend them. Thank you.
July 28, 2025Harald S.Verified patient
Staff was very polite and helpful.. Dr
July 21, 2025David C.Verified patient
Friendly and helpful doctor. Listen to all my concerns and issues and has recommended things that are making a difference. Would recommend.
June 30, 2025Anthony G.Verified patient
Dr Coronel was a great listener. The appointment was for my intellectually delayed son. He spoke directly to my son and made sure that he explained everything on my son’s level. He made my son very comfortable.
March 6, 2025Anthony M.Verified patient
Kind doctor who I like very much.
February 26, 2025Frank G.Verified patient
Very nice first impression and great bedside manner. This is a quality I look for in my physicians. I hope the next visit goes just as well!
January 9, 2025Karen A.Verified patient
Dr Coronel was very easy to talk with, he described the whole procedure to me in detail and was easy to understand. I would highly recommend him.
December 12, 2024Gerard R.Verified patient
I will go back
November 20, 2024Peter D.Verified patient
November 10, 2024Nicole C.Verified patient
Being a new patient, I was pleased to have the opportunity to book an appointment online and to be seen by Dr. Coronel at an early date. I found Dr. Coronel to be very professional, courteous, and knowledgeable. His staff is great, too!
August 22, 2024Harald S.Verified patient
Friendly atmosphere and beautiful office
June 5, 2024Initials hidden
Dr. Mark C was outstanding, and his staff were top-notch. The facility is new and clean. I can't say enough about the ladies that work there and how comfortable they make you feel.
April 18, 2024Alexander P.Verified patient
I absolutely love this place. They are so welcoming and comforting. The Dr was thorough and explained things to me in a way I would understand. Very patient and she was extremely kind.
March 15, 2024Laquita M.Verified patient
Dr Coronel very friendly caring and explained everything so you understand. His staff is amazingly friendly that makes you feel so comfortable the minute you walk in office
February 15, 2024Donna S.Verified patient
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How soon can I make an appointment with Dr. Mark Coronel?
Generally, Dr. Mark Coronel has appointments available on Zocdoc within 1 week. You can see Dr. Coronel's earliest availability on Zocdoc and make an appointment online.
Is Dr. Mark Coronel accepting new patients?
Dr. Mark Coronel generally accepts new patients on Zocdoc. You can see Dr. Coronel's earliest availability on Zocdoc and schedule an appointment online.
Does Dr. Mark Coronel accept my insurance?
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Can I make an appointment with Dr. Mark Coronel online?
Yes, you can make an appointment online with Dr. Coronel using Zocdoc. It’s simple, secure, and free.
Which hospital is Dr. Mark Coronel affiliated with?
Dr. Mark Coronel is affiliated with Peconic Bay Medical Center.
What practice does Dr. Mark Coronel work with?
Where is Dr. Mark Coronel's office located?
Dr. Mark Coronel has 3 office locations, including in Riverhead and Manorville, view full addresses on Dr. Coronel's profile.
Which board certifications does Dr. Mark Coronel have?
Dr. Mark Coronel is certified by American Board of Internal Medicine and Gastroenterology (Internal Medicine).
What are common reasons for patients to see Dr. Mark Coronel?
Dr. Mark Coronel frequently sees patients for Abdominal Pain, Colonoscopy, Diarrhea, Gastroenterology Consultation, and Hemorrhoids. You can see other visit reasons for Dr. Mark Coronel on their profile.
What languages does Dr. Mark Coronel speak?
Dr. Mark Coronel speaks English.
How do patients rate Dr. Mark Coronel in reviews?
254 patients have reviewed Dr. Mark Coronel. The overall rating for this doctor is 4.8/5. They have a 4.86/5 rating for bedside manner and a 4.84/5 rating for wait time. You can read individual reviews and ratings on their profile.