Gastroenterology Fellowship at Mount Sinai South Nassau
The Gastroenterology Fellowship at Mount Sinai South Nassau is a fully accredited, three-year training program designed to develop expert clinicians and future leaders in the field. The program leverages the clinical and academic resources of two premier institutions: Mount Sinai South Nassau and Mount Sinai Hospital.
Fellows receive comprehensive training in clinical gastroenterology, endoscopy, and hepatology, guided by a strong core curriculum. In addition, the fellowship includes dedicated subspecialty rotations in inflammatory bowel diseases, pancreaticobiliary disorders, advanced endoscopy, gastrointestinal oncology, GI motility, and liver transplantation. Throughout the program, fellows are encouraged to pursue scholarly activities, supported by experienced faculty mentors. This includes opportunities in clinical research, quality improvement, and academic writing, all tailored to individual interests and career goals.
For fellows who have completed their Gastroenterology Fellowship, the GI Division also offers two, one-year advanced training fellowships: Advanced/Interventional Endoscopy fellowship
Curriculum
Learn more about the curriculum.
Fellows are trained in all areas of gastroenterology and hepatology and are provided protected time to focus on subspecialty areas within these fields.
Current and Past Fellows
1st year 3rd year Fellows (Residency Program)
Moshe Fenster, MD (Mount Sinai South Nassau)
Silpa Yarra, MD (Mount Sinai Beth Isreal Med Center)
2nd year Fellows (Residency Program)
Haidar Khan, MD (Mount Sinai Elmhurst)
Sharon Slomovich, MD (Mount Sinai South Nassau)
3rd year Fellows (Residency Program)
Lahkanna Muhddesa, DO (Mount Sinai South Nassau)
Jonathan Reyes, MD (Mount Sinai Elmhurst)
See our list of graduates and where they are now:
Neal Shah, 6/2025 NYU Advance Fellowship
Manoor Khan, 9/2025 Columbia Advance Fellowship
How to Apply
The Mount Sinai South Nassau Hospital offers two positions in the Match for our fully accredited three-year Fellowship in Gastroenterology. The gastroenterology fellowship program participates in the National Resident Matching Program (NRMP). Applicants should register with the NRMP in order to participate in the Gastroenterology Match. Applications for the Gastroenterology Match are accepted through ERAS (Electronic Residency Application System). We will only review applications that are processed through ERAS. Due to the heavy volume of applications we receive, we are usually able to arrange personal interviews with no more than 5-10 percent of our applicants.
Contact Us
Halima Chukalingam
Fellowship Coordinator
Division of Gastroenterology
Mount Sinai South Nassau
1 Healthy Way
Oceanside, NY 11572
Tel: 516-497-7523
Fax: 516-497-7558
halima.chukalingam@mountsinai.org
Meet the Program Leadership
Frank Gress, MD
Chief, Division of Gastroenterology & Hepatology
Program Director of Gastroenterology Fellowship
Message from the Program Director
Greetings. Welcome to the Gastroenterology Fellowship at Mount Sinai South Nassau. Our goal is to train competent and compassionate and confident gastroenterologists.
We are excited to train the next generation of gastroenterologists as a young and vibrant program. We have a high volume of endoscopy cases in our program and fellows begin on day 1. In our program you will be exposed to simple and complex cases. We have a multifaceted wellness program led by Dr. Advani, a member of our core faculty. Our Associate Program Director is Dr. Pruthvi Patel. We have our fellows writing peer reviewed papers and presenting at local, regional, and national conferences. We have highly active and busy programs in third space endoscopy, IBD, ENDO, manometry and interventional endoscopy.
For transplant and complex hepatobiliary we partner with Mount Sinai and fellows spend 2 months at the main campus in Manhattan for a rich experience.
Our program is sponsored by the Icahn School of Medicine at Mount Sinai.
Ultimately, we invite you to share our passion for the field of Gastroenterology.
Sincerely,
Frank Gress
Pruthvi Patel, MD
Associate Program Director
Curriculum
Learn more about the curriculum.
The clinical curriculum of the Gastroenterology Fellowship at Mount Sinai South Nassau is thoughtfully designed to provide comprehensive training across all areas of inpatient and outpatient Gastroenterology and Hepatology—regardless of a fellow's ultimate career path.
Fellows rotate through a wide range of specialized services, including:
- Inpatient GI Consults
- Endoscopy
- Inflammatory Bowel Disease (IBD)
- Hepatology
- Motility Disorders
- Endobariatrics
- Third-Space Endoscopy
- Ambulatory Clinics
A strong emphasis is placed on the appropriate indications for endoscopic procedures and their meticulous, safe execution—under the close supervision of expert teaching faculty.
Each month, a core academic theme is selected and explored through a series of structured learning activities. These include:
- Didactic Fellows Conference
- Clinical Case Conference
- Journal Club
These sessions are typically guided by faculty with specialized expertise in the topic area, providing fellows with deep insight into complex clinical issues and evolving practices.
As fellows advance through the program, their clinical responsibilities are progressively tailored to reflect growing expertise. Senior fellows are encouraged to lead in the management of patients with complex and rare digestive diseases, preparing them for independent practice or academic careers.
Our institution serves a diverse patient population, offering exposure to both common and rare gastrointestinal conditions. Patient safety and quality improvement are foundational pillars of the training program, integrated into both clinical practice and academic inquiry.
Fellows dedicate a significant portion of their training to original research under the guidance of experienced faculty mentors. Research training is supported by divisional resources and opportunities to present at local, regional, and national conferences.
By the end of their training, fellows are well equipped to deliver excellent patient care and contribute to the fields of gastroenterology and hepatology. Attending conferences, poster presentations,
Core Rotations
The Mount Sinai South Nassau GI Consultation Service
The Mount Sinai South Nassau Inpatient GI consult service is comprised of 2 – 3 GI fellows and one gastroenterology attending.
Medical students, PA Students, and internal medicine residents routinely rotate on the service as well. The fellows are responsible for directing and managing all aspects of gastrointestinal care, including endoscopic procedures. Daily work, endoscopy, bedside rounds and teaching rounds are all conducted under the supervision of the GI attending. In order to facilitate teaching and learning of both endoscopy and inpatient consultative gastroenterology, inpatient endoscopy procedures are split between a dedicated Endoscopy Team and the GI Consult Team.
The 400 bed Mount Sinai South Nassau is a high volume, high acuity care facility located on South Shore of Long Island. Inpatients are comprised of a diverse population with routine medical conditions from the surrounding region, as well as complex patients transferred to Mount Sinai Hospital for quaternary care.
Subspecialty Rotations
These rotations provide the fellow with the opportunity to develop an in-depth appreciation of subspecialty areas. Fellows with a particular interest in one area may choose to dedicate more time to this area through an elective block or during the research rotation. Novel rotations can be developed and tailored to the individual fellow’s interests.
The inflammatory bowel disease (IBD) service exposes fellows to patients with complex manifestations of ulcerative colitis and Crohn’s disease. Emphasis is placed on understanding the surgical and medical management of these conditions, along with proper interpretation of diagnostic imaging and endoscopic studies.
Hepatology training is an integral part of the Gastroenterology Fellowship and is conducted across multiple clinical settings to provide progressive responsibility and expertise.
- First-Year Fellows focus on inpatient hepatology consultations, working up a wide range of liver diseases. They also participate in a monthly clinical case conference, where complex inpatient cases are discussed in-depth with faculty and peers to enhance clinical reasoning and decision-making skills.
- Second-Year Fellows take part in an outpatient pre-transplant clinic to learn how to diagnose and manage liver diseases in multi-disciplinary care.
- Third-Year Fellows spend three months at Mount Sinai Hospital’s renowned liver transplant service. During this rotation, fellows acquire hands-on experience managing patients before and after liver transplantation, including perioperative care, immunosuppression management, and long-term follow-up.
This graduated exposure ensures fellows develop the knowledge and skills necessary to expertly diagnose, treat, and manage the full spectrum of liver diseases, preparing them for independent hepatology practice or advanced academic roles.
Advanced Endoscopy rotation provides exposure to EUS and ERCP. This rotation also provides exposure to 2nd and 3rd year fellows in complex endoscopic techniques such as endoscopic mucosal resection, enteral stent placement and radiofrequency ablation.
Two months of outpatient selective rotations during the third-year exposes fellows to experts who specialize in liver and GI Motility and provides fellows with diverse multidisciplinary exposure to these important subspeciality areas. Fellows will rotate with physicians as well as allied health professionals (physical therapists, dieticians, etc) to gain a comprehensive understanding of these disorders.
Additional subspecialty electives are available during the 2nd and 3rd year for fellows seeking advanced training in a particular area of clinical interest.
Ambulatory Training
During all three years of fellowship, fellows maintain a weekly Continuity Clinic. The Fellows assume primary responsibility for the patients they see in the practice, including initial consultation, follow up visits, interpretation of testing results, and coordination of care with other specialties with supervision of faculty member. The fellows capitalize on the extensive resources allocated to ambulatory care, including social workers, nutritionists, nurses, and other staff supports (medical assistant, endoscopy liaison, insurance specialists).
To enable graduated learning and better prepare fellows for independent practice, ambulatory clinic for the 3rd year fellows is organized at the faculty practice location. This practice setting provides a novel continuity experience with a special focus on ambulatory decision making and practice management. A dedicated pre-clinic conference further supports the transition to independent practice.
Fellows see new and established patients with complex diagnostic and management issues related to IBD. The multidisciplinary IBD Center offers a wide array of support services to patients, including dieticians, endostomal therapists, social workers, psychologists, clinical pharmacologists, nurses and nurse practitioners, Quality improvement, research coordinators, and administrative staff.
Endoscopy Training
Endoscopy training occurs throughout the entire three-year fellowship. Dedicated inpatient endoscopy rotations provide focused training and experience in endoscopic procedures on hospitalized patients. Additional rotations with the advanced endoscopy faculty provide experience in endoscopic mucosal resection, stricture dilation, and radiofrequency ablation. Fellows gain significant experience with chromoendoscopy through working with IBD faculty.
The rotation schedule is divided as follows:
First Year
- GI Consult Service: 24 weeks
- Endoscopy rotation: 20 weeks
Second Year
- GI Consult Service: 16 weeks
- Endoscopy: 18 weeks
- Hepatology: 4 weeks
- Advanced Endoscopy: 6 weeks
Third Year
- GI Consult service: 8 weeks
- Endoscopy: 16 weeks
- Advanced Endoscopy: 4 weeks
- Elective: 4 weeks
- Liver transplant: 8 weeks
Conferences
Conferences serve as a foundation of the teaching program. Each week the following conferences are held:
Tuesdays
GI Grand Rounds (monthly) 7:30-8:30am
Research conference- every 2nd Tuesday from 6pm-7pm.
Wednesdays
Radiology or Hepatobiliary Pancreas or Pathology Conferences 7:30-8:30am
Thursdays
Fellow's Curriculum lectures 7:30-9:30am
Fellow Board Review 12pm
Related Resources
The Present-Levison Advanced IBD Fellowship
A program dedicated to training physicians to care for patients with IBD
Advanced Endoscopy Fellowship
A program to train physicians in the techniques of advanced therapeutic endoscopy
GI Fellowship at Mount Sinai South Nassau
Learn more about our GI Fellowship at MSSN
The Present-Levison Advanced IBD Fellowship
A program dedicated to training physicians to care for patients with IBD
Advanced Endoscopy Fellowship
A program to train physicians in the techniques of advanced therapeutic endoscopy
Message from the Program Director