Mark Gregory Lazarev, M.D.

Headshot of Mark Gregory Lazarev
  • Associate Professor of Medicine


Anal Fistula, Celiac Disease, Clinical Gastroenterology, Colitis, Colon Polyps, Crohn's Disease, Diarrhea, Digestive Disorders, Fecal Microbiota Transplantation, Gastroenterology, GI Dysplasia, Ileitis, Inflammatory Bowel Disease (IBD), Microscopic Colitis, Pouchitis, 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
Joppa Concourse
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 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. more


  • Associate Professor of Medicine

Departments / Divisions

Centers & Institutes



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


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


  • Gastroenterology; The Mount Sinai Hospital (2009)
  • Gastroenterology; University of Pittsburgh School of Medicine (2008)

Board Certifications

  • American Board of Internal Medicine (Gastroenterology) (2008)
  • American Board of Internal Medicine (Internal Medicine) (2005)

Activities & Honors


  • Top Doctor, Baltimore Magazine, 2020 - 2020

Videos & Media

Play Video:

Crohn's Disease | Amanda's Story

Recent News Articles and Media Coverage

WebMD Perspectives, A Closer Look at Crohn's Disease (2021)

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

Patient Ratings & Comments

The Patient Rating score is an average of all responses to physician related questions on the national CG-CAHPS Medical Practice patient experience survey through Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are also gathered from our CG-CAHPS Medical Practice Survey through Press Ganey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

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