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 (3)

The overall average patient rating of Dr. John Marshall is Good. Dr. Marshall has been reviewed by 10 patients who have provided 3 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.1
Promptness 3.3
Courteous Staff 4.8
Accurate Diagnosis 4.4
Bedside Manner 3.9
Spends Time with Me 3.5
Follows Up After Visit 4.1

Specialties & Research

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

  • He has special expertise in 6 areas:
  • Biological Therapy (Immunotherapy)
  • Cancer
  • Clinical Research
  • Epidemiology
  • Gastrointestinal Cancer
  • Hepatocellular Carcinoma

Education & Awards

Dr. Marshall graduated from University of Louisville . He has 2 awards.

Castle Connolly America's Top Doctors® (2006 - 2008, 2010 - 2015)
Castle Connolly America's Top Doctors® for Cancer (2005 - 2007, 2009 - 2012, 2014 - 2015)


Dr. Marshall has 2 hospital affiliations:

  • Georgetown University Hospital 
  • Georgetown Univ. 


  • Arabic
  • French
  • German
  • Italian
  • Persian
  • Spanish
  • English

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Additional Information
Dr. John Lindsay Marshall MD is a male Oncologist , has 23 years of experience and practices in Medical Oncology.
Where does Dr. John L. Marshall practice?
Dr. John Marshall has 1 office location.
Dr. John Marshall practices Medical Oncology near Washington, DC.
See Washington Oncologists.