Dr. Dean N. Cassimatis, MD | New Windsor, NY | Gastroenterology

.about .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Dr. Dean Cassimatis is a gastroenterologist and internal medicine physician with four decades of medical experience. He earned his medical degree from New York Medical College, where he also completed his residency training. His extensive background allows him to provide comprehensive care for digestive health issues as well as general internal medicine concerns. Dr. Cassimatis is fluent in both English and Spanish.

Dr. Cassimatis practices at Montefiore Saint Lukes Cornwall and sees patients at multiple locations throughout New Windsor and Newburgh. He specializes in treating colon polyps, GERD, and diverticular disease. His procedural expertise includes pathology tests and surgical pathology evaluations. Patients have given him an average rating of 4.6 out of 5 on Vitals.

AI-generated from data on this provider profile.

accepting new patients
4.6

62 Ratings
40 years of experience
speaks English, Spanish
New York Medical College
29 written reviews
2 specialties
11 areas of expertise
2 board certifications
1 hospital affiliation
3 office locations
Male

62 ratings & reviews

Sort:

Showing 1 to 10 of 29 reviews

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

best

July 16th, 2020

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Very caring

February 18th, 2020

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

He comes in with his hand extended for a welcome hand shake and less then 5 minutes after walking in he ends the appointment by sticking his hand out for a "goodbye" hand shake. I was left with questions that went unanswered. He has not returned my request for a call back. I get the impression he's only in it for the money. That's not what I want in a gastroenterologist.

June 3rd, 2019

1 person found this helpful

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

My husband and I have been seeing him for years. He is attentive, responsive and compassionate. The best around !

February 6th, 2019

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

excellent !

August 5th, 2018

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

One of the best in orange county.

October 28th, 2017

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

professional, caring, empathetic...great doctor. personally returns calls . kind and patient.

October 10th, 2015

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

very nice and accurate

January 17th, 2015

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

i recently underwent a colonoscopy for the first time and i was petrified... he was so reassuring and comforting. the procedure thankfully turned out well and was a most pleasantly surprising experience. i highly recommend him.

August 27th, 2014

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

I have seen Dr. Cassimatis 4 times. He always is within 5-10 of being on time and I really like that. The Dr. is professional and couteous, but mostly he is kind and understanding about issues. He is excellent at every procedure and , frankly he saved my life. I like and respect this Drs opinion, most importantly, I TRUST him and that really says it all!

July 22nd, 2013

Horizon Family Medical Group

277 Quassaick AveNew Windsor, NY 12553

Tel: (845) 565-5630

Mon9:00 am - 5:00 pm

Tue9:00 am - 5:00 pm

Wed9:00 am - 5:00 pm

Thu9:00 am - 5:00 pm

Fri9:00 am - 5:00 pm

SatClosed

SunClosed

Horizon Family Medical Group

88 Old Route 9WNew Windsor, NY 12553

Tel: (845) 549-1011

Mon7:00 am - 3:00 pm

Tue7:00 am - 3:00 pm

Wed7:00 am - 3:00 pm

Thu7:00 am - 3:00 pm

Fri7:00 am - 3:00 pm

SatClosed

SunClosed

Montefiore Saint Lukes Cornwall

70 Dubois StNewburgh, NY 12550

Tel: (845) 561-4400


Dr. Dean Nick Cassimatis, MD	Rebecca Humphries, APRN	Dr. Kristen Kyong Lee, MD	Lynn Collette-Zachar, APRN
Gastroenterology	Gastroenterology	Gastroenterology	Gastroenterology
Accepts New Patients	Accepts New Patients	Accepts New Patients	Accepts New Patients
4.6 (62 Ratings)	0 (0 Ratings)	5 (7 Ratings)	4 (4 Ratings)
40 Years of Experience		17 Years of Experience
No Virtual Visit Option	Virtual Visit Available	Virtual Visit Available	Virtual Visit Available
Speaks English, Spanish	Speaks English	Speaks English	Speaks English
New Windsor , NY	SACRAMENTO , CA	NEW YORK , NY	Tallahassee , FL
Med School: New York Medical College	Med School: Emory University	Med School: Cornell University	Med School: Regis College
Current Profile	View Profile	View Profile	View Profile

Search for your insurance and plan

Accepts Medicare
Accepts Medicaid

Abdominal Pain
Acid Reflux Disease (Gastroesophageal Reflux / GERD)
Acid Reflux Disease (GERD)
Celiac Disease
Colonoscopy
Constipation
Hemorrhoids
Hepatitis C
Internal Medicine
Irritable Bowel Syndrome (IBS)
Ulcerative Colitis

MEDICAL LICENSE

Medical Doctor, New York, 2026, Expired

EDUCATION & TRAINING

Residency

New York Medical College

Medical School

New York Medical CollegeGraduated in 1986

Dr. Jay B Tuchman, MD
Anesthesiology
23 Years Exp | Pittsburgh, PA
(1)
Dr. Kurt Matthew Small, MD
Anesthesiology
26 Years Exp | Bristol, TN
(13)
Dr. Pinaki Sengupta, MD
Addiction Medicine
43 Years Exp | Houlton, ME
(0)
Dr. Tonusri Nag, DO
Interventional Cardiology
| Nyack, NY
(0)
Dr. George Michael Woods, MD
Anesthesiology
38 Years Exp | Anchorage, AK
(0)
Dr. Neeraj Modi, MD
Diagnostic Radiology
18 Years Exp | Bethlehem, PA
(0)
Dr. Sri Ranga Lakshmi Bonam, MD
Nephrology
26 Years Exp | Pomona, NY
(11)
Dr. Chinyelu Enuma Oraedu, MD
Hospital Medicine
24 Years Exp | Stamford, CT
(0)
Dr. Omprakash Murlidhar Bhatt, MD
Critical Care Medicine
43 Years Exp | Philadelphia, PA
(4)
Dr. Stephen Charles Matchett, MD
Critical Care Medicine
39 Years Exp | Newburgh, NY
(1)

Does Dr. Dean Cassimatis accept my insurance?: You can see the insurance plans that Dr. Dean Cassimatis accepts on their Vitals profile.
Is Dr. Dean Cassimatis accepting new patients?: Dr. Dean Cassimatis is accepting new patients on Vitals. View Dr. Dean Cassimatis's profile on Vitals to make an appointment.
Does Dr. Dean Cassimatis accept virtual/telehealth appointments?: Dr. Dean Cassimatis has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
Which hospitals is Dr. Dean Cassimatis affiliated with?: Dr. Dean Cassimatis is affiliated with Montefiore Saint Lukes Cornwall.
Where is Dr. Dean Cassimatis's office located?: Dr. Dean Cassimatis's office is located at 277 Quassaick Ave, New Windsor, NY, 12553.

Our provider data is gathered directly from physicians and publicly available databases. Providers who verify their profiles gain the ability to update information, offering additional details about their specialties,education, treated conditions, performed procedures, and accepted insurances.

Reviews on Vitals are submitted by users only. Recognizing the valuable insights these reviews offer into a doctor's reputation, we maintain internal policies and protocols to ensure the quality and accuracy of all reviews. Importantly, providers cannot delete or alter reviews independently. Reviews can only be deleted or changed following an internal assessment by our customer service team.

Your feedback is highly valued and we encourage you to contact our support team should you encounter any issues.

Copyright © 2026 Vitals Consumer Services, LLC. US Patent No. 8, 694, 441. All Rights Reserved.
As more fully set forth in this website's terms of use . (1) nothing contained on or offered by or through this website should be construed as medical advice and should not be relied upon for medical diagnosis or treatment. Vitals Consumer Services, LLC ("Vitals"). the provider of this website, does not recommend or endorse any particular healthcare provider whose information or ratings appear on this website; and (2) Vitals has granted you a limited license to access and use this website for your own noncommercial use. You are not permitted to copy, reproduce, distribute, transmit, mirror, frame, scrape, extract, wrap, create derivative works of, reverse engineer, decompile or disassemble any part or aspect of this website.