
Niamh M. Keegan, MBBCh BAO
Medical Oncologist
Titles
Assistant Attending Physician
Clinical Expertise
Genitourinary Malignancies
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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.
New Patient Appointments
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Dr. Keegan accepts the following list of insurance providers. Select your insurance provider to see more details.
Payor Type: Commercial
In Network Coverage Type(s): HMO, EPO PPO, POS, Transplant
Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): PPO
Payor Type: Commercial
In Network Coverage Type(s): HMO, PPO
Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, EPO, HMO
Payor Type: Commercial
In Network Coverage Type(s): HMO, EPO PPO, POS
Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): HMO
Payor Type: Commercial
In Network Coverage Type(s): Supplemental
Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, HMO
Payor Type: Commercial
In Network Coverage Type(s): POS, EPO, HMO
Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, EPO, HMO
Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): HMO
Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): PPO, HMO
Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): PPO, HMO, DSN
Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): HMO
Payor Type: Commercial
In Network Coverage Type(s): PPO
Payor Type: Commercial
In Network Coverage Type(s): HMO, EPO
Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): HMO
Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): HMO
Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): PPO
Payor Type: Commercial
In Network Coverage Type(s): EPO, HMO, PPO, POS
Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): HMO
Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): HMO, PPO
Payor Type: Commercial
In Network Coverage Type(s): PPO EPO
Payor Type: Commercial
In Network Coverage Type(s): HMO
Payor Type: Commercial
In Network Coverage Type(s): PPO
Payor Type: Commercial
In Network Coverage Type(s): EPO
Payor Type: Commercial
In Network Coverage Type(s): EPO
Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): PPO, HMO
Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): State Government
Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, EPO
Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): State Government
Payor Type: Medicaid/Managed Medicaid
In Network Coverage Type(s): State Government
Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): Federal Government
Payor Type: Commercial
In Network Coverage Type(s): Supplemental
Payor Type: Commercial
In Network Coverage Type(s): PPO/OAP
Payor Type: Other
In Network Coverage Type(s): PPO, POS, EPO, HMO
Payor Type: Medicare/Medicare Advantage
In Network Coverage Type(s): TBD
Payor Type: Commercial
In Network Coverage Type(s): HMO/EPO
Payor Type: Commercial
In Network Coverage Type(s): PPO, EPO
Payor Type: Commercial
In Network Coverage Type(s): State Government
Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, HMO
Payor Type: Commercial
In Network Coverage Type(s): PPO, HMO
Payor Type: Commercial
In Network Coverage Type(s): PPO, POS
Payor Type: Commercial
In Network Coverage Type(s): PPO, POS, HMO
Contact and Location
- 646-422-4896 Office Phone
- Speaks English
- Memorial Sloan Kettering Nassau Uniondale, NY
- Memorial Sloan Kettering Westchester West Harrison, NY

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.
See all locationsAbout Me
Education
MBBCh BAO (Medicine), University of Dublin, Trinity College
Residencies
General Internal Medicine - Royal College of Physicians of Ireland
Fellowships
Medical Oncology - Royal College of Physicians of Ireland; Advanced Oncology - Memorial Sloan Kettering Cancer Center; Special Fellowship (Prostate Cancer and Biomarker Development) – Memorial Sloan Kettering Cancer Center
Board Certifications
Internal Medicine; Medical Oncology (Ireland and Europe)
I am a medical oncologist specializing in the care of people with genitourinary (GU) malignancies (prostate, bladder, kidney, and testicular cancer). At Memorial Sloan Kettering Cancer Center (MSK), I work closely with a multidisciplinary team of surgeons, radiation oncologists, pathologists, radiologists, nurses, and supportive care specialists to develop a personalized care plan for each patient. I believe in a team-based approach to cancer treatment that involves not only my MSK colleagues, but also my patients. I partner with patients to understand their unique needs and preferences. Together, we aim to achieve evidence-based care that considers the many dimensions of life impacted by cancer and its treatment.
Read more
I am passionate about improving our understanding of GU cancer and developing new interventions through clinical trials. In addition to standard-of-care treatment options, our team provides access to emerging therapies through promising and innovative clinical trials delivered closer to home at MSK’s locations in New York’s Westchester and Nassau counties. Our team also works on studies that seek to better comprehend how specific cancer therapies will affect patients. This includes efforts to identify early indicators of treatment sensitivity (treatment that is likely to be effective) and resistance that can be determined before treatment begins to support more accurate treatment selection.
I pursued a career in medical oncology because I believe it represents the fusion of commitment to patient-centered care, evidence-based practice, and the relentless pursuit of scientific innovation. After completing my training in medical oncology, I pursued advanced fellowship training at MSK, with a focus on immunotherapy for GU cancer, translational science in prostate cancer, and prostate cancer therapeutics.
It is a great source of pride for me to care for people with GU cancer and contribute to MSK’s long-established, distinguished leadership in the development of cutting-edge cancer care. At MSK, I have the privilege of caring for patients alongside extraordinary mentors and colleagues, who share my goal of delivering individualized care of the highest quality.
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

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. Keegan’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
At MSK, we’re committed to delivering the best care to every patient. We use feedback from our patients to continue to improve our care. We also post patient reviews online to help you make healthcare choices. Learn more about our patient experience reviews.