- Mount Sinai Doctors
- Treats Adults
- Accepting New Patients
Thomas A Ullman, MD
Gastroenterology
About Me
Dr. Thomas Ullman is a Professor of Medicine in Mount Sinai’s Division of Gastroenterology and the Director of the Westchester branch of Mount Sinai’s Susan and Leonard Feinstein Inflammatory Bowel Disease Clinical Center. He received his medical degree from Cornell University Medical College in 1992 and stayed to complete his residency in internal medicine at the New York Hospital. This was followed by a GI fellowship at Yale University where he developed his interest in caring for patients with Crohn’s disease and ulcerative colitis.
Dr. Ullman first joined the faculty of the Icahn School of Medicine at Mount Sinai in 1999, pursuing state of the art clinical care of IBD patients and research questions pertaining to the relationship between IBD and colorectal cancer. Among other items, Dr. Ullman has led national efforts to improve quality of care in IBD. He has numerous original publications and book chapters relating to IBD care as well having lectured broadly locally, nationally, and internationally on numerous IBD topics to colleagues and patients. He is a Fellow of the American College of Gstroenterology and presently its Governor for Southern New York, an American Gastroenterological Association Fellow, and a previous member of the Crohn’s and Colitis Foundation’s National Scientific Advisory Committee, having chaired its Professional Education Committee, its Membership Committee, and its Government and Industry Affairs Committee in support of its mission. He was previously a longstanding Board member of the Foundation’s Westchester-Fairfield chapter. The Foundation has also twice honored him with the Humanitarian of the Year Award at both its New York and Westchester-based chapters. Prior to his return to Mount Sinai, he was the Chief of Gastroenterology at Montefiore Medical Center and the Albert Einstein College of Medicine. Prior to those responsibilities, he was the Senior Associate Dean for Clinical Affairs and Chief Medical Officer of Mount Sinai’s Doctors Faculty Practice. He has been recognized as a New York Magazine and Castle Connolly Top Doctor in gastroenterology numerous times.
In his spare time, Dr. Ullman is an avid guitar player, cook, reader, and New York Giants fanatic. He lives in Westchester County with his wife of more than 30 years, where they raised their three daughters.
Language
English
Position
PROFESSOR | Medicine, Gastroenterology, SENIOR ASSOCIATE DEAN FOR CLINICAL AFFAIRS
Hospital Affiliations
- Mount Sinai Queens
- The Mount Sinai Hospital
Clinical Focus
- Colon Polypectomy
- Colon Polyps
- Colonoscopy
- Colorectal Cancer
- Crohn's Disease
- Inflammatory Bowel Disease
- Ulcerative Colitis
- Upper GI Endoscopy
Education
MD, Weill Medical College of Cornell University
Internship, Internal Medicine
New York Presbyterian Weill-Cornell Internal Medicine
Residency, Internal Medicine
New York Presbyterian Weill-Cornell Internal Medicine
Fellowship, Gastroenterology and Hepatology
Yale University
Certifications
American Board of Internal Medicine
Research
Dr. Ullman's major research focus is cancer in inflammatory bowel disease. His work includes identification of the clinical risk factors for colon cancer in IBD. He has conducted studies detailing the natural history of dysplasia in ulcerative colitis, the influence of inflammation on carcinogenesis in IBD, and the relative chemopreventive effects of a number of therapies used in UC. Additionally, Dr. Ullman is pursuing research into biomarkers of disease diagnosis and activity in IBD, and the outcomes of patients with Crohn's disease and ulcerative colitis treated with cyclosporine A.
Insurance Information
Accepted insurance may vary by the doctor’s office location. Please contact the office directly to obtain the most up-to-date insurance information.
- 1199 SEIU
- AETNA - Commercial
- AETNA - Medicare
- Affinity Medicaid-Medicare-Essential Exchange
- Amidacare Medicaid
- CIGNA Healthcare
- Centivo
- Elderplan
- EmblemHealth - GHI-PPO
- EmblemHealth - HIP
- EmblemHealth - HIP-Medicaid
- EmblemHealth - HIP-Medicare
- Empire Blue Cross Blue Shield - Commercial/Exchange
- Empire Blue Cross Blue Shield - HealthPlus Medicaid
- Empire Blue Cross Blue Shield - Medicare
- Fidelis Health Care
- HealthFirst Medicaid
- HealthFirst Medicare
- Healthfirst Exchange
- Horizon NJ
- Magnacare-Health Care
- Medicare - NJ
- Medicare - NY
- Metroplus
- Multiplan PHCS
- NJ Medicaid
- NY Medicaid
- Oscar
- Oxford - Freedom and Liberty
- Partners Health Plan
- Senior Whole Health
- United Health Care - Commercial
- United Health Care - Empire Plan
- United Health Care - Oxford Care
- United Health Care - Top Tier
- VNSNY Choice Medicare
- VNSNY Select Health Medicaid
- VillageCareMax
- WellCare Health Plan
Physicians who provide services at hospitals and facilities in the Mount Sinai Health System might not participate in the same health plans as those Mount Sinai hospitals and facilities (even if the physicians are employed or contracted by those hospitals or facilities).
Information regarding insurance participation and billing by this physician may be found on this page, and can also be obtained by contacting this provider directly. Because physicians insurance participation can change, the insurance information on this page may not always be up-to-date. Please contact this physician directly to obtain the most up-to-date insurance information.
Insurance and health plan networks that the various Mount Sinai Health System hospitals and facilities participate in can be found on the Mount Sinai Health System website.
Patient Experience Star Ratings and Comments
The Patient Experience Star Rating reflects our patients’ perception of how well their Mount Sinai provider communicated with them during an office visit. The Star Rating is based on patient responses to three questions on a patient experience survey, a standardized questionnaire sent to verified patients and distributed by a third party vendor, Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score.
Dr. Ullman is the best. The extremely rare combination of tremendous experience, intelligence, and kindness.
I had a great experience with Dr. Ullman. He took the time to listen to my experience and go through my past medical history. He was thorough and understanding. I would recommend him to others.
He is a compassionate, brilliant doctor.
Industry Relationships
Physicians and scientists on the faculty of the Icahn School of Medicine at Mount Sinai often interact with pharmaceutical, device, biotechnology companies, and other outside entities to improve patient care, develop new therapies and achieve scientific breakthroughs. In order to promote an ethical and transparent environment for conducting research, providing clinical care and teaching, Mount Sinai requires that salaried faculty inform the School of their outside financial relationships.
Below are financial relationships with industry reported by Dr. Ullman during 2024 and/or 2025. Please note that this information may differ from information posted on corporate sites due to timing or classification differences.
Consulting or Other Professional Services Examples include, but are not limited to, committee participation, data safety monitoring board (DSMB) membership
- Guardant Health, Inc.
- Johnson & Johnson
- Bristol-Meyers Company
- Pfizer Inc., U.S. Pharmaceuticals Group
Mount Sinai’s faculty policies relating to faculty collaboration with industry are posted on our website. Patients may wish to ask their physician about the activities they perform for companies.