
Garrett M. Nash, MD, MPH, FACS, FASCRS
Colorectal Surgeon
My Role at MSKWe post reviews for MSK healthcare providers who have at least 30 patient experience surveys completed. If you do not see reviews for a provider, it may be because they do not yet have enough survey responses, or the provider may not be part of the group of healthcare providers included in the survey.
Only outpatient providers are included in the survey. Healthcare providers who only work in the hospital or in urgent care are not included in the survey. Pathologists or researchers who do not provide direct care to patients do not have reviews.
Areas of Expertise
My Specialties
- Gastrointestinal Cancers
- Carcinoid/Neuroendocrine Tumors
- Peritoneal Surface Malignancies
Request an Appointment
About Me
- Vice Chair for Quality and Safety, Department of Surgery
I am a surgeon with specialized training in cancers of the colon, rectum, anus, appendix, and peritoneum. The focuses of my practice include minimally invasive techniques for colorectal cancer (including laparoscopy, single-incision laparoscopy, and robotic surgery), avoiding colostomy while preserving bowel, bladder, and sexual function, and the management of peritoneal surface malignancies (including pseudomyxoma peritonei and mesothelioma).
Read more
My clinical research involves prospective clinical trials of new technology and surgical techniques for advanced colorectal, appendiceal, and peritoneal malignancies, as well as optimizing surgical margins and lymph node retrieval for colon and rectal cancers. I am the primary investigator for the ICARuS Trial (Intraperitoneal Chemotherapy After cytoReductive Surgery). This is a randomized clinical trial investigating the benefit of intraperitoneal chemotherapy for metastatic appendiceal and colorectal cancer. It will be the first-ever prospective trial with the primary goal of measuring the efficacy of intraperitoneal chemotherapy for appendix cancer worldwide and the first randomized trial of intraperitoneal chemotherapy for colorectal cancer in the United States.
I have authored papers on a variety of subjects including cytoreductive surgery, intraperitoneal chemotherapy, minimally invasive surgery, sphincter-sparing rectal surgery, mechanisms of tumor progression, and predictors of outcome following surgery.
I have raised over $75,000 to support cancer research at Memorial Sloan Kettering by completing eleven races for Fred’s Team — NYC Half Marathons each year from 2010 through 2014 and NYC Marathons in 2010, 2011, 2013, 2014, 2015, and 2017. This November, I will be running the NYC Marathon to raise money for cancer research at MSK.
If you wish to make a donation for cancer research or learn more about Fred’s Team, please visit this website: Garrett Nash on Fred’s Team.
A colorectal (KOH-loh-REK-tul) surgeon is a doctor with special training in surgery on the colon and rectum.
My Specialties
- Gastrointestinal Cancers
- Carcinoid/Neuroendocrine Tumors
- Peritoneal Surface Malignancies
- Pseudomyxoma Peritonei
- Mesothelioma
- Minimally Invasive and Robotic Surgery
- Intraperitoneal Chemotherapy
- Clinical Trials in Surgery
Education
- MD, Columbia University
Residencies
- Surgery - University of Massachusetts Medical School
- Surgery - New York Presbyterian/Weill Cornell Medical College
Awards and Honors
- Top Doctors New York Metro Area, Castle Connolly (2023)
- Castle Connolly: America's Top Doctors (2016-2023)
- Castle Connolly: New York Magazine Best Doctors (2017-2022)
Fellowships
- Colon and Rectal Surgery – NewYork-Presbyterian/Columbia and Weill Cornell
- Colorectal Oncology - Memorial Sloan Kettering Cancer Center
Board Certifications
- Surgery
- Colon and Rectal Surgery
Insurance Information
Understanding your insurance options is an important part of managing your cancer care. We have relationships with many common healthcare providers and plans.
In Network Coverage Type
PPO
In Network Coverage Type
HMO, PPO
In Network Coverage Type
HMO, EPO PPO, POS
In Network Coverage Type
PPO
In Network Coverage Type
EPO
In Network Coverage Type
EPO
In Network Coverage Type
Federal Government
In Network Coverage Type
PPO, POS, EPO, HMO
In Network Coverage Type
State Government
Don't see your carrier or plan? We can help you understand your coverage.
If you don't have health insurance or are worried that your care may not be fully covered, our financial assistance programs may be able to help.
If you have questions about insurance, call us at 646-497-9176.
Make an Appointment

New Patients
Current Patients
Contact and Location
Dr. Nash sees patients at one location.
Looking to see a doctor at a different location? See all MSK locations.
Colleagues
Doctors at Memorial Sloan Kettering work as teams, with specialists from all different areas. This allows us to consider all your needs together, and to give you the best possible care.
Clinical Trials
- Clinical Trials Investigated by Dr. Nash
- A Phase 2 Study of Additional Chemotherapy After Surgery for People With Malignant Peritoneal Mesothelioma
- ICARuS (Intraperitoneal Chemotherapy After cytoReductive Surgery): A Phase II Study of Early Post-Operative Abdominal Chemotherapy versus Heated Abdominal Chemotherapy for Cancers of the Appendix, Colon, or Rectum that Have Spread to the Abdominal Lining

Memorial Sloan Kettering's doctors and scientists are constantly developing new treatments for cancer. MSK is typically running hundreds of clinical trials at a given time.
You may be able to participate in a clinical trial even if you are new to MSK. Search our online directory to find trial information and see more about who can participate.
Search clinical trialsResearch and Publications
Visit PubMed for a full listing of Dr. Nash’s journal articles. Pubmed is an online index of research papers and other articles from the US National Library of Medicine and the National Institutes of Health.
See all on PubMedPatient Reviews
Your trust is our main concern
We strive to keep reviews trustworthy, honest and fair. Learn more about our patient experience reviews.
Disclosures
Doctors and faculty members often work with pharmaceutical, device, biotechnology, and life sciences companies, and other organizations outside of MSK, to find safe and effective cancer treatments, to improve patient care, and to educate the health care community.
MSK requires doctors and faculty members to report (“disclose”) the relationships and financial interests they have with external entities. As a commitment to transparency with our community, we make that information available to the public.
Garrett M. Nash discloses the following relationships and financial interests:
No disclosures meeting criteria for time period
If you’re a patient at MSK and would like more information about your doctor’s external relationships, please talk with your doctor.
The information published here is for a specific annual disclosure period. There may be differences between information on this and other public sites as a result of different reporting periods and/or the various ways relationships and financial interests are categorized by organizations that publish such data.
This page and data include information for a specific MSK annual disclosure period (January 1, 2022 through disclosure submission in spring 2023). This data reflects interests that may or may not still exist. This data is updated annually.
Learn more about MSK’s COI policies here. For questions regarding MSK’s COI-related policies and procedures, email MSK’s Compliance Office at [email protected].