Memorial Sloan Kettering surgical oncologist Martin Weiser

Martin R. Weiser, MD

Colorectal Surgeon

Titles

Vice Chair for Faculty Affairs, Department of Surgery; Stuart H.Q. Quan Chair in Colorectal Surgery

Clinical Expertise

Colon and Rectal Cancer Surgery; Anal Cancer; Appendiceal Cancer; Minimally Invasive Surgery

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646-497-9065
Monday through Friday, 8:00 a.m. to 6:00 p.m., (Eastern time)
Accepted Insurance Providers

Dr. Weiser accepts the following list of insurance providers. Select your insurance provider to see more details.

Aetna

Payor Type: Commercial
In Network Coverage Type(s): HMO, EPO PPO, POS, Transplant

Aetna Medicare Advantage (City of NY retirees only, starting 9/1/23)

Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): PPO

Blue Cross Blue Shield Federal Employee Program

Payor Type: Commercial
In Network Coverage Type(s): HMO, PPO

Blue Cross Blue Shield New York

Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, EPO, HMO

Blue Cross Blue Shield states outside of NY/NJ

Payor Type: Commercial
In Network Coverage Type(s): HMO, EPO PPO, POS

Blue Cross Health Plus

Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): HMO

Carrum Health

Payor Type: Commercial
In Network Coverage Type(s): Supplemental

Cigna

Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, HMO

Connecticare

Payor Type: Commercial
In Network Coverage Type(s): POS, EPO, HMO

Emblem

Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, EPO, HMO

Emblem Essential

Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): HMO

Emblem Medicare Advantage

Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): PPO, HMO

Empire Blue Cross Medicare Advantage

Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): PPO, HMO, DSN

Empire Essential

Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): HMO

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

Payor Type: Commercial
In Network Coverage Type(s): PPO

Fidelis

Payor Type: Commercial
In Network Coverage Type(s): HMO, EPO

Fidelis Managed Medicaid & HARP

Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): HMO

Fidelis Medicare Advantage

Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): HMO

First Health

Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): PPO

Healthfirst

Payor Type: Commercial
In Network Coverage Type(s): EPO, HMO, PPO, POS

Healthfirst Managed Medicaid

Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): HMO

Healthfirst Medicare Advantage

Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): HMO, PPO

Healthsmart

Payor Type: Commercial
In Network Coverage Type(s): PPO EPO

Horizon Blue Cross Blue Shield New Jersey (HMO)

Payor Type: Commercial
In Network Coverage Type(s): HMO

Horizon Blue Cross Blue Shield New Jersey (PPO)

Payor Type: Commercial
In Network Coverage Type(s): PPO

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

Payor Type: Commercial
In Network Coverage Type(s): EPO

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

Payor Type: Commercial
In Network Coverage Type(s): EPO

Horizon Medicare Advantage

Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): PPO, HMO

Husky CT Medicaid

Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): State Government

Magnacare

Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, EPO

Straight NJ Medicaid

Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): State Government

Straight NY Medicaid

Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): State Government

Medicare Part A&B (traditional Medicare)

Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): Federal Government

Multiplan/Beech Street/PHCS

Payor Type: Commercial
In Network Coverage Type(s): Supplemental

MVP

Payor Type: Commercial
In Network Coverage Type(s): PPO/OAP

Non-Participating Plans with Out of Network Benefits

Payor Type: Other
In Network Coverage Type(s): PPO, POS, EPO, HMO

NYC Medicare Advantage Plus for City Employees

Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): TBD

Oscar

Payor Type: Commercial
In Network Coverage Type(s): HMO/EPO

Oxford

Payor Type: Commercial
In Network Coverage Type(s): PPO, EPO

World Trade Center Health Program (WTC)

Payor Type: Commercial
In Network Coverage Type(s): State Government

Qualcare

Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, HMO

Tricare

Payor Type: Commercial
In Network Coverage Type(s): PPO, HMO

UMR

Payor Type: Commercial
In Network Coverage Type(s): PPO, POS

United Healthcare

Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, HMO

Contact and Location

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Find a Convenient Location

Memorial Sloan Kettering has locations throughout New York City, Long Island, New Jersey, and Westchester. These locations offer many services, including screening, chemotherapy, and medical testing.

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About Me

Education

MD, University of Chicago

Residencies

General Surgery - Brigham and Women's Hospital

Fellowships

Surgical Oncology - Memorial Sloan Kettering Cancer Center; Colon and Rectal Surgery - Mount Sinai Medical Center

Board Certifications

Surgery; Colon and Rectal Surgery

As a surgical oncologist, I specialize in treating cancers of the gastrointestinal tract such as colon cancer, rectal cancer, anal cancer, small bowel cancers, and appendiceal cancer. I am skilled at treating primary, metastatic, and recurrent tumors.

My expertise in minimally invasive (laparoscopic and robotic) surgery enables me to remove tumors without causing significant trauma to the patient. Whenever possible, I use nerve-sparing surgical techniques that preserve sphincter, bladder, and sexual function.

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My clinical research focuses on increasing the accuracy of tumor staging and improving the methods of predicting outcomes following cancer surgery. I monitor and update Memorial Sloan Kettering’s colorectal cancer database, which we use to track patient outcomes and ensure that we are providing the highest quality of care. My laboratory research focuses on understanding the mechanisms underlying tumor spread and metastasis and on targeting those mechanisms in designing effective treatments. This work includes developing new tools to identify and measure tumor DNA in the bloodstream. I am also the surgical lead for the international prospective randomized trial PROSPECT, which is aimed at individualizing rectal cancer treatment in order to improve outcomes and reduce treatment-related toxicity.

In my practice, I emphasize personalized patient care. Physician assistants, nurses, and staff at our clinic pay careful attention to each patient’s particular needs. We also emphasize a team approach and work closely with specialists in radiation oncology, medical oncology, and other services. Members of this multidisciplinary team discuss individual cases at our weekly conferences with the goal of providing the most comprehensive care possible.

I have served as MSK’s Medical Staff President, Chair of the Colorectal Task Group for the Society of Surgical Oncology, Colorectal Track Leader for the Education Committee of the American Society of Clinical Oncology, and Program Chair of the Annual Meeting of the American Society of Colon and Rectal Surgeons. Currently, I serve on the staging committee and the precision medicine committee of the American Joint Committee on Cancer, which works on updating the colorectal cancer staging system used by cancer centers throughout the United States.  

I am a member of the editorial boards of the Journal of Clinical Oncology, Annals of Surgical Oncology, International Journal of Surgery, and Scientific American Surgery, and I serve as the Colorectal Surgery section editor for UpToDate, an online resource for patients and physicians. I often review submitted manuscripts for the New England Journal of Medicine, Science, the Journal of the American Medical Association, and Lancet Oncology. My publications include over 250 research articles, book chapters, reviews, and editorials on a variety of topics, such as laparoscopic and robotic surgery, the biology of colon and rectal cancers, the treatment of rare anorectal tumors, cancer staging, predictors of outcomes following surgery, and the mechanisms of tumor metastasis. I also lecture nationally and internationally on the management of colorectal, anal, and appendiceal cancers and on the latest advances in minimally invasive surgery.

In my practice, I emphasize personalized patient care. Physician assistants, nurses, and staff at our clinic pay careful attention to each patient’s particular needs.

-Dr. Weiser

Awards and Honors

  • Castle Connolly: America's Top Doctors (2023)
  • Castle Connolly: New York Magazine Top Doctors (2012-2020)

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.

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Clinical Trials

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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.

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Research and Publications

View Dr. Weiser's Lab

Selected Book Chapters

Weiser MR and Saltz LB. Chapter 44 Adenocarcinoma of the Colon and Rectum. In Scientific American Surgery. 2015

Patel S and Weiser MR. Robotic Rectal Surgery. In Rectal Cancer: Modern Approaches to Treatment (Chang et al, editors) 2016

Pappou M and Weiser MR. Proctectomy. In The ASCRS Textbook of Colon and Rectal Surgery. 2016.

Weiser MR. Robotic Right Hemicolectomy. SAGES Manual. 2017

Pappou M and Weiser MR. Total Mesorectal Excision. In Textbook of Surgical Oncology 2016

Weiser MR. Open, Laparoscopic, and Robotic Right Hemicolectomy for Cancer. Mastery of Surgery. 2017

Fedler S and Weiser MR. Pelvic Exenteration. In Colon and Rectal Surgery: Abdominal Operations 2nd Ed. 2017.

Langan R and Weiser MR. Stage IV Colorectal Cancer. In Clinical Decision Making in Colorectal Surgery, 2nd edition, edited by Dr. Scott Steele, Justin Maykel, and Steven D. Wexner. Springer Science and Business Media. 2017

Weiser MR and Garcia-Aguilar J Basic Principles of the Operative Treatment of Colorectal Cancer In: Yeo CJ, ed. Shackelford’s Surgery of the Alimentary Tract, 8th edition. Elsevier; 2018.

Weiser MR. Perspective on colorectal neoplasms. In Zinner M and Ashley S (ed.), Maingot’s Abdominal Operations, 13th ed., in press. McGraw-Hill, New York.

Kleiman DA, Weiser MR. 2018. Locally advanced rectal cancer. In Hochwald SN and Cance WG (ed.), Complex General Surgical Oncology. Decker, Toronto. https://www.deckerip.com/products/cgso/

Publications on PubMed

Visit PubMed for a full listing of Dr. Weiser’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.

Martin R. Weiser discloses the following relationships and financial interests:

  • Ultimate Opinions in Medicine LLC
    Provision of Services
  • UptoDate
    Intellectual Property Rights; Provision of Services

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, 2021 through disclosure submission in spring 2022). 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].


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