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Attention Johns Hopkins Bayview patients, staff and visitors: As a result of a fire across the street from the Johns Hopkins Bayview Campus in Southeast Baltimore, the facilities department has shut down the ventilation system at that location to prevent smoke from entering the handling system.

Additionally, Eastern Avenue is closed at Bayview Blvd., and Bayview Blvd is closed southbound at Mason Lord Drive. Please use Lombard Street to enter and exit the campus. If you are on campus, please remain indoors.

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Mark Gregory Lazarev, M.D.

Photo of Dr. Mark Gregory Lazarev, M.D.

Assistant Professor of Medicine


Expertise: Celiac Disease, Clinical Gastroenterology, Colitis, Colon Polyps, Crohn's Disease, Diarrhea, Digestive Diseases, Gastroenterology, Inflammatory Bowel Disease (IBD), Proctitis, Ulcerative Colitis more

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The Johns Hopkins Hospital (Main Entrance)
Appointment Phone: 410-933-7495

1800 Orleans St.
Sheikh Zayed Tower
Baltimore, MD 21287 map

Johns Hopkins Medicine - Green Spring Station
Appointment Phone: 410-616-7350

2360 W. Joppa Road
Lutherville, MD 21093 map
Phone: 410-616-7350


Dr. Lazarev joined Johns Hopkins from the Mount Sinai Medical Center in New York, where he completed the Present-Levison advanced inflammatory bowel disease (IBD) fellowship.

A specialist in the diagnosis and management of Crohn's disease and ulcerative colitis, Dr. Lazarev has published numerous peer-reviewed articles, abstracts and chapters. He is board-certified in gastroenterology and internal medicine. more


  • Assistant Professor of Medicine



  • MD, University of Pittsburgh School of Medicine (2002)


  • Beth Israel Deaconess Medical Center / Internal Medicine (2005)


  • University of Pittsburgh School of Medicine / Gastroenterology (2008)
  • Mount Sinai Medical Center / Gastroenterology (2009)

Board Certifications

  • American Board of Internal Medicine / Gastroenterology (2008)

Videos & Media

Recent News Articles and Media Coverage

Tales from the Crypt, Inside Tract (Summer, 2016) 

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