Maryland Oncology Hematology remains open while making accommodations for the health and safety of our patients. If you believe you have been exposed to COVID-19 or have symptoms of COVID-19 including fever, cough, sore throat or shortness of breath, please call our office before you arrive. Any patient that has traveled out of state, please call before your appointment for travel information and review our travel policy. Our Mt. Airy location is now open and Wheaton patients now call Rockville & Germantown. View more information.


John Wallmark, M.D.

John Wallmark, M.D.


Medical Oncology


9905 Medical Center Drive, Suite 200
Rockville, MD 20850-6535
Phone: 301-424-6231
Fax: 301-294-4648
View Map

6420 Rockledge Dr, #4200
Bethesda, MD 20817-7847
Phone: 301-424-6231
Fax: 301-929-0611
View Map

John Wallmark, M.D.


Boston College

Medical School

Hahnemann University


University of North Carolina, Internal Medicine


University of North Carolina, Internal Medicine


University of Pennsylvania, Oncology Hematology

Board Certification

  • Internal Medicine
  • Hematology
  • Medical Oncology


  • American Medical Association (AMA)
  • American College of Physicians (ACP)
  • Montgomery County Medical Society (MCMS)
  • Medical & Chirurgical Faculty of the State of Maryland (MedChi)
  • American Society of Clinical Oncology (ASCO)


As an innovative thought leader, Dr. Wallmark has an unwavering commitment to provide excellent and compassionate care to hisnpatients. He is passionate about developing a renowned research program, offering state-of- the art, novel therapies close to home. Under his research leadership, he and his colleagues have developed one of the leading community research programs in the country. Patients now have access to early drug development/phase I trials outside of an academic center. He is a published author on numerous research topics. His special interests include breast cancer, lymphomas, myeloma and leukemia.

He is active in the following professional societies: American Medical Association, American College of Physicians, Montgomery County Medical Society, Medical & Surgical Faculty of the State of Maryland and the American Society of ClinicalOncology. Dr. Wallmark also served at the Suburban Breast Center Risk Assessment Program as physician advisor and counselor.