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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (2)

The overall average patient rating of Dr. Marshall Posner is Good. Dr. Posner has been reviewed by 7 patients who have provided 2 comments. The rating is 4 out of 5 stars.

Patient Ratings
Ease of Appointment 4.2
Promptness 4.2
Courteous Staff 4.2
Accurate Diagnosis 4.2
Bedside Manner 4.2
Spends Time with Me 4.2
Follows Up After Visit 4.2

Specialties & Research

Dr. Marshall Posner, MD is board certified in Medical Oncology.

  • He has special expertise in 16 areas:
  • Adjuvant Chemotherapy
  • Cancer
  • Chronic BCR-ABL Positive Myelogenous Leukemia
  • Clinical Research
  • Colon Cancer
  • Colorectal Cancer
  • Epidemiology
  • Glandular Cancer (Adenocarcinoma)
  • Head and Neck Cancer
  • Hodgkin Disease
  • Immune System Disorders
  • Leukemia
  • Local Neoplasm Recurrence
  • Multiple Myeloma (Cancer of Plasma Cells)
  • Squamous Cell Carcinoma
  • Viral Cell Transformation

Education & Awards

Dr. Posner graduated from Tufts University, Boston. He has 6 awards.

One of America's Leading Experts on:
Head and Neck Cancer (Head and Neck Neoplasm)
Squamous Cell Carcinoma
Castle Connolly America's Top Doctors® (2010 - 2015)
Castle Connolly America's Top Doctors® for Cancer (2005 - 2007, 2009 - 2012, 2014 - 2015)
Castle Connolly Top Doctors: New York Metro Area™ (2011 - 2015)
Compassionate Doctor Recognition (2014)


Dr. Posner has 11 hospital affiliations:

  • Massachusetts General Hospital 
  • Brigham and Women's Hospital 


  • Spanish

> > > > Dr. Marshall Posner, MD

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Additional Information
Dr. Marshall Roy Posner MD is a male Oncologist , has 36 years of experience and practices in Medical Oncology.
Where does Dr. Marshall R. Posner practice?
Dr. Marshall Posner has 1 office location.
Dr. Marshall Posner practices Medical Oncology near New York, NY.
See New York Oncologists.