Photo of Ari Grinspan

Ari Grinspan

  • ASSISTANT PROFESSOR Medicine, Gastroenterology
Print ProfilePrint Profile



  • American Board of Internal Medicine


  • MD, Albert Einstein College of Medicine

  • Residency, Internal Medicine
    New York Presbyterian - Weill Cornell Medical Center

  • Fellowship, Gastroenterology
    Mount Sinai Hospital


    Dr. Grinspan received his MD from the Albert Einstein College of Medicine in New York. He performed his internal medicine training at New York-Presbyterian Hospital. He then completed his fellowship in Gastroenterology at Mount Sinai Medical Center, where he remains as full time faculty. He is currently an Assistant Professor of Medicine in the Icahn School of Medicine at Mount Sinai. He pioneered the Fecal Microbiota Transplant (FMT) program to treat recurrent and refractory Clostridium difficile infection at Mount Sinai, which has developed into a referral center for the tri-state area. His research focuses on exploring the mechanism and clinical utility of FMT in Clostridium difficile infection and Inflammatory Bowel Disease.


  • 2013 - 2014
    Chief GI Fellow
    Mount Sinai Medical Center

  • 2011 -
    Daniel M. Libby MD Program Directors Award
    New York-Presbyterian Hospital

  • 2010 - 2011
    Assistant Chief Resident
    New York-Presbyterian Hospital

  • 2008 -
    Alpha Omega Alpha
    Albert Einstein College of Medicine

  • 2004 -
    Phi Beta Kappa
    University of Pennsylvania


Fecal Microbiota Transplantation (FMT)

Dr. Grinspan has pioneered the Fecal Microbiota Transplantation (FMT) program at Mount Sinai to treat recurrent and refractory Clostridium difficile infection.

Industry Relationships

Physicians and scientists on the faculty of the Icahn School of Medicine at Mount Sinai often interact with pharmaceutical, device and biotechnology companies 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 relationships with such companies.

Dr. Grinspan did not report having any of the following types of financial relationships with industry during 2014 and/or 2015: consulting, scientific advisory board, industry-sponsored lectures, service on Board of Directors, participation on industry-sponsored committees, equity ownership valued at greater than 5% of a publicly traded company or any value in a privately held company. Please note that this information may differ from information posted on corporate sites due to timing or classification differences.

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.

Insurance Information

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.

Edit profile in Sinai Central


5 East 102nd Street Floor 5th floor
New York, NY 10029


5 East 102nd Street Floor 5
New York, NY 10029

Tel: 212-241-8100
Feinstein IBD Clinical Center

17 East 102nd Street
5th Floor
New York, NY 10029

Tel: 212-241-8100
Fax: 646-537-8921
Get Directions

Office Hours:
  • Monday 9:00am - 5:00pm
  • Tuesday 9:00am - 5:00pm
  • Wednesday 9:00am - 5:00pm
  • Thursday 9:00am - 5:00pm
  • Friday 9:00am - 5:00pm
Payment Methods
  • Master Card
  • Visa
  • American Express
  • Discover
  • Personal Check
  • Cash

Academic Office (No Patients)

Annenberg Building
1468 Madison Avenue, 5th Fl.
New York, NY 10029

Tel: 212-241-4514
Fax: 646-537-8647
Get Directions