Find an MSK Doctor or Cancer Specialist
Surgeon Garrett Nash

Garrett M. Nash, MD, MPH, FACS, FASCRS

Colorectal Surgeon

Areas of Expertise

Conditions I Treat

  • Gastrointestinal cancers and conditions
  • Colon cancer
  • Rectal cancer

My Specialties

  • Minimally invasive surgery
  • Robotic surgery
  • Clinical trials
View all
Dr. Nash's Office Information
Languages: English
Request an Appointment
Our Care Advisors can answer many of your questions. They will connect you with the best healthcare provider for your needs.
Back to top
English
Share

Get to Know Me

I am a surgeon who cares for people with cancers of the colon, rectum, anus, appendix, and peritoneum. I also serve as the Vice President of Quality and Safety where I am responsible for managing MSK’s clinical quality, patient safety, and infection control.

I am experienced in the treatment of cancers within the peritoneal cavity (the space between the organs in the abdomen), such as pseudomyxoma peritonei and mesothelioma. Additionally, I have specialized training in using the latest surgical approaches for colorectal cancer, including robotic surgery.

When patients first meet with me, they are often anxious about their diagnosis. Many have received information about their prognosis that can sometimes be quite different from our patients’ outcomes. As a result, they have many questions about how cancer and its treatment will affect their quality of life and outlook.

Read more

I take the time to listen, address their concerns, and explain their treatment options, including how and why they may differ from those recommended elsewhere. We work together to develop a care plan that considers the specifics of each person’s cancer diagnosis. We also consider each person’s unique needs and preferences so we can offer the best possible result. I want my patients to feel supported and know that they are in the best hands at Memorial Sloan Kettering Cancer Center (MSK).

In my role as Vice President of Quality and Safety, I am committed to ensuring the best and safest experience for our patients and staff at MSK. I focus on data analysis to improve processes, teach and train staff, and help nurture a culture of safety and transparency.  As a clinician, my primary research focus is developing clinical trials to understand how cancer spreads to the peritoneal region and testing the effectiveness of peritoneal therapy.

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 (giving chemotherapy directly into the abdomen after surgery) for people with appendiceal or colorectal cancer that has spread to other parts of the body. It is the first-ever prospective trial with the primary goal of measuring the efficacy of intraperitoneal chemotherapy for appendix cancer worldwide. It is also the first randomized trial of intraperitoneal chemotherapy for colorectal cancer completed in the United States.

I am also the primary investigator of ICARuS II. This randomized clinical trial opened in 2023 and is studying the efficacy of intraperitoneal therapy for people with peritoneal mesothelioma.

In addition, I am working with scientists in medical oncology and at the Sloan Kettering Institute (SKI) to develop new therapies for peritoneal disease. For example, we are using an antibody called SADA (Self-Assembling and Disassembling) to deliver therapeutic agents, such as radioactive isotopes or chemotherapy, directly to the cancer cells. We hope to bring this from the laboratory to a first-in-human clinical trial soon. I am passionate about supporting cancer research at MSK. I have raised over $150,000 by completing numerous races for Fred’s Team®. I have run NYC Half Marathons each year from 2010 through 2014, and 10 NYC Marathons (in 2010, 2011, 2013-15, 2017, 2018, and 2021-2023).

To learn more about Fred’s Team® or to make a donation, visit fredsteam.org.

What I Do at MSK

A colorectal (KOH-loh-REK-tul) surgeon is a doctor with special training in surgery on the colon and rectum.

  • Vice President of Quality and Safety
Areas of Expertise

Conditions I Treat

  • Gastrointestinal cancers and conditions
  • Colon cancer
  • Rectal cancer
  • Neuroendocrine tumors
  • Mesothelioma

My Specialties

  • Minimally invasive surgery
  • Robotic surgery
  • Clinical trials
  • Intraperitoneal chemotherapy
Education & Honors

Education

  • MD, Columbia University Vagelos College of Physicians and Surgeons
  • MPH, Harvard T.H. Chan School of Public Health

Residencies

  • Surgery, University of Massachusetts Medical School
  • Surgery, NewYork-Presbyterian/Weill Cornell Medical College

Fellowships

  • Colon and Rectal Surgery, NewYork-Presbyterian/Columbia and Weill Cornell
  • Advanced Colorectal Oncology, Memorial Sloan Kettering Cancer Center

Board Certifications

  • Surgery
  • Colon and Rectal Surgery

Awards and Honors

  • Castle Connolly: America’s Top Doctor (2025)
  • Castle Connolly: America’s Top Doctor (2024)
  • Castle Connolly: America’s Most Honored Doctors – Top 1% (2022-2023)
  • Castle Connolly: Top Doctors New York Metro Area (2017-2023)
  • Castle Connolly: America's Top Doctors (2016-2023)
  • Castle Connolly: New York Magazine Best Doctors (2017-2023)

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.

Aetna

In Network Coverage Type
HMO, EPO PPO, POS, Transplant

Aetna Medicare Advantage (MTA and NYC retirees only)

In Network Coverage Type
PPO

Anthem BCBS and other BCBS licensee plans

In Network Coverage Type
PPO, POS, EPO, HMO

See updates

Anthem BCBS Health Plus

In Network Coverage Type
HMO

See updates

Blue Cross Blue Shield Federal Employee Program

In Network Coverage Type
HMO, PPO

See updates

Blue Cross Blue Shield states outside of NY/NJ

In Network Coverage Type
HMO, EPO PPO, POS

See updates

Carrum Health

In Network Coverage Type
Supplemental

Cigna

In Network Coverage Type
PPO, POS, HMO

Connecticare

In Network Coverage Type
POS, EPO, HMO

First Health

In Network Coverage Type
PPO

Straight NJ Medicaid

In Network Coverage Type
State Government

Straight NY Medicaid

In Network Coverage Type
State Government

Emblem

In Network Coverage Type
PPO, POS, EPO, HMO

Offers a qualified health plan from the Health Insurance Marketplace. Call Emblem to learn more.

Emblem Essential

In Network Coverage Type
HMO

Emblem Medicare Advantage (Medicare Choice PPO Network and VIP Prime Network Only)

In Network Coverage Type
PPO, HMO

Empire Essential

In Network Coverage Type
HMO

Empire Plan / NYSHIP (Blue Cross/UnitedHealthcare split plan)

In Network Coverage Type
PPO

See updates

Fidelis

In Network Coverage Type
HMO, EPO

Offers a qualified health plan from the Health Insurance Marketplace. Call Fidelis to learn more.

Fidelis Managed Medicaid & HARP

In Network Coverage Type
HMO

Fidelis Medicare Advantage

In Network Coverage Type
HMO

Healthfirst

In Network Coverage Type
EPO, HMO, PPO, POS

Offers a qualified health plan from the Health Insurance Marketplace. Call Healthfirst to learn more.

Healthfirst Managed Medicaid

In Network Coverage Type
HMO

Healthfirst Medicare Advantage

In Network Coverage Type
HMO, PPO

Healthsmart

In Network Coverage Type
PPO EPO

Horizon Blue Cross Blue Shield New Jersey (HMO)

In Network Coverage Type
HMO

See updates

Horizon Blue Cross Blue Shield New Jersey (PPO)

In Network Coverage Type
PPO

See updates

Horizon Blue Cross Blue Shield New Jersey Omnia Tier I (EPO)

In Network Coverage Type
EPO

See updates

Horizon Blue Cross Blue Shield New Jersey Omnia Tier II (EPO)

In Network Coverage Type
EPO

See updates

Horizon Medicare Advantage

In Network Coverage Type
PPO, HMO

Husky CT Medicaid

In Network Coverage Type
State Government

Magnacare

In Network Coverage Type
PPO, POS, EPO

Medicare Part A&B (traditional Medicare)

In Network Coverage Type
Federal Government

Metroplus

In Network Coverage Type
HMO

City Employee Health Plans (Gold and Gold Care)

Multiplan/Beech Street/PHCS

In Network Coverage Type
Supplemental

MVP

In Network Coverage Type
PPO/OAP

Non-Participating Plans with Out of Network Benefits

In Network Coverage Type
PPO, POS, EPO, HMO

NYC Medicare Advantage Plus for City Employees

In Network Coverage Type
TBD

Oscar

In Network Coverage Type
HMO/EPO

Oxford

In Network Coverage Type
PPO, EPO

World Trade Center Health Program (WTC)

In Network Coverage Type
State Government

Qualcare

In Network Coverage Type
PPO, POS, HMO

Tricare

In Network Coverage Type
PPO, HMO

UMR

In Network Coverage Type
PPO, POS

United Healthcare

In Network Coverage Type
PPO, POS, HMO

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

Women talking
New Patients
Scheduling an appointment is easy. Click or call 646-497-9065— we’re available 24 hours a day, 7 days a week
Make an Appointment
Current Patients
Request an appointment by logging in to MSK MyChart or calling your Care Team. If you are not enrolled in MSK MyChart, ask your Care Team to send you an invitation. You can also go to MSK MyChart and select “Sign up now.”

Contact and Location

Dr. Nash sees patients at one location.

Office Phone
Location
New York, NY
Rockefeller Outpatient Pavilion
160 East 53rd Street New York NY 10022
Get Directions

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.

See all Surgery doctors

See all Colorectal Service doctors

Clinical Trials

Smiling doctors in the lab
Find a Clinical Trial for You

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 trials

Research and Publications

Publications on PubMed

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 PubMed

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 a complement to other publicly reported data and 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, 2023 through disclosure submission in spring 2024). 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].


View all disclosures

Related topics: