Find an MSK Doctor or Cancer Specialist
Memorial Sloan Kettering colorectal surgeon Maria Widmar

Maria Widmar, MD, MPH

Colorectal Surgeon

4.9 | 223 reviews

Areas of Expertise

Conditions I Treat

  • Colon cancer
  • Rectal cancer
  • Anal cancer

My Specialties

  • Minimally invasive surgery
  • Laparoscopic surgery
  • Robotic surgery
View all
Dr. Widmar's Office Information
Languages: English, Portuguese, and Spanish
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 see patients at Memorial Sloan Kettering Commack and Memorial Sloan Kettering Nassau. I also see select patients at the Rockefeller Outpatient Pavilion in New York City. 

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.

  • Assistant Attending Surgeon
Areas of Expertise

Conditions I Treat

  • Colon cancer
  • Rectal cancer
  • Anal cancer
  • Appendiceal (appendix) cancer and conditions
  • Inflammatory bowel disease (IBD)
  • Crohn's disease
  • Ulcerative colitis

My Specialties

  • Minimally invasive surgery
  • Laparoscopic surgery
  • Robotic surgery
Education & Honors

Education

  • MD, Icahn School of Medicine at Mount Sinai
  • MPH, Icahn School of Medicine at Mount Sinai

Residencies

  • General Surgery - Icahn School of Medicine at Mount Sinai
  • General Preventive Medicine and Public Health - Icahn School of Medicine at Mount Sinai

Fellowships

  • Research Fellowship in Colorectal Surgery - Memorial Sloan Kettering Cancer Center
  • Clinical Fellowship in Colorectal Surgery - Weill Cornell Medical Center
  • Clinical Fellowship in Advanced Colorectal Surgical Oncology - Memorial Sloan Kettering Cancer Center

Board Certifications

  • Surgery

Awards and Honors

  • David A. Dreiling Chief Resident Award for Excellence in Surgical Achievement (2017)
  • Cancer Prevention and Control Research Prize Winner, American College of Preventive Medicine Annual Conference (2015)
  • Dr. Arthur H. Aufses, Sr. Prize in Surgery, Icahn School of Medicine at Mount Sinai (2010)

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

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

First Health

In Network Coverage Type
PPO

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

Straight NJ Medicaid

In Network Coverage Type
State Government

Straight NY Medicaid

In Network Coverage Type
State Government

Medicare Part A&B (traditional Medicare)

In Network Coverage Type
Federal Government

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. Widmar sees patients at three locations.

Office Phone
Location
Commack, NY
Uniondale, NY
New York, NY
Memorial Sloan Kettering Commack Nonna’s Garden Foundation Center
650 Commack Road Commack NY 11725
Get Directions
Memorial Sloan Kettering Nassau
1101 Hempstead Turnpike Uniondale NY 11553
Get Directions
Rockefeller Outpatient Pavilion
160 East 53rd Street New York NY 10022
Get Directions
Map MarkerA msk map marker icon
Map MarkerA msk map marker icon
Map MarkerA msk map marker icon
Leaflet © OpenStreetMap contributors; © CARTO.

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 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. Widmar’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

Patient Reviews

Your trust is our main concern

We strive to keep reviews trustworthy, honest and fair. Learn more about our patient experience reviews.

4.9 223 reviews

  • 4.8 Provider's Explanations Easy to Understand
  • 4.8 Trusts Provider with Care
  • 4.8 Provider Listened Carefully
  • 4.9 Likelihood of Recommending Provider
Feb 20, 2025

Courteous , timely and clean. Very good experience

Feb 13, 2025

My experience was positive regarding all who helped me. I felt comfortable sharing information with my care team.

Feb 13, 2025

I have total faith in my care team and the care I continue to receive at MSK

Feb 13, 2025

Great people who have your best interest in mind.

Feb 13, 2025

I waited 1 1/2 hours in the waiting room

View more +
Ratings and Comments Powered by NRC Health

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.

Maria Widmar 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 ecoi@mskcc.org.


View all disclosures

Related topics: