Jimmitti Teysir

Jimmitti Teysir, MD

Breast Medical Oncologist

Areas of Expertise

Conditions I Treat

  • Breast cancers and conditions

My Specialties

  • Clinical trials
Dr. Teysir's Office Information
Languages: English
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Get to Know Me

I am a breast medical oncologist at Memorial Sloan Kettering Cancer Center (MSK), who diagnoses and treats people for breast cancer. I see patients at MSK Commack on Long Island.

I am devoted to providing personalized, compassionate care and supporting patients and their families throughout their diagnosis and treatment. I work as part of a group of experts across different teams, including surgeons, radiation oncologists, nurses, and other specialists who are dedicated to delivering the highest quality care together.

My research focuses on clinical trials related to hormone receptor–positive breast cancer, with an emphasis on understanding and overcoming treatment resistance. As a member of MSK’s Global Cancer Research and Training (GCRT) Program, I am also committed to advancing access to cancer care and research in diverse communities worldwide.

What I Do at MSK

I'm a breast medical oncologist, which is a cancer doctor who specializes in breast cancer.

  • Assistant Attending Physician
Areas of Expertise

Conditions I Treat

  • Breast cancers and conditions

My Specialties

  • Clinical trials
Education & Honors

Education

  • BA, Yale University
  • MD, Icahn School of Medicine at Mount Sinai

Residencies

  • Internal Medicine, Massachusetts General Hospital

Fellowships

  • Medical Oncology, Memorial Sloan Kettering Cancer Center

Board Certifications

  • Internal Medicine

Awards and Honors

  • Young Investigator Award, Conquer Cancer Foundation (2025)
  • T32 Hematology–Oncology Research Training Grant Fellow, National Cancer Institute (NCI)/Memorial Sloan Kettering Cancer Center (2024–2025)

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.

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

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New Patients
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Current Patients
Request an appointment by calling your Care Team or messaging them in MSK MyChart.

Contact and Location

Office Phone
Location
Commack, NY
Memorial Sloan Kettering Commack Nonna’s Garden Foundation Center
650 Commack Road Commack NY 11725
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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 Breast Medicine Service doctors

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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