The 20 Best Colonoscopy Doctors near Baltimore, MD

Gastroenterologist Mouen Khashab specializes in therapeutic endoscopy, and he oversees this group of practitioners across the Johns Hopkins enterprise. Nationally and internationally known in the field of interventional endoscopy, Dr. Khashab has contributed immensely to the field’s advancement as a minimally invasive means to treat gastrointestinal and pancreaticobiliary disorders. Dr. Khashab earned his medical degree from the American University of Beirut Faculty of Medicine, and subsequently completed a residency in internal medicine and a fellowship in gastroenterology at Indiana University. He then completed a two-year fellowship at The Johns Hopkins Hospital before joining the faculty in 2011. A busy researcher, Dr. Khashab has published more than 600 papers in peer-reviewed journals. In 2013, he described the procedure called gastric peroral endoscopic myotomy (known as G-POEM) and was able to disseminate and teach it all over the world. Other procedures that he expanded include peroral endoscopic myotomy (POEM), peroral endoscopic myotomy with fundoplication (POEM-F), Zenker’s peroral endoscopic myotomy (Z-POEM) and full thickness resection. In 2022, he received the Master Endoscopist Award from the American Society for Gastrointestinal Endoscopy (ASGE) for his numerous contributions to the field. His procedural expertise includes endoscopic retrograde cholangiopancreatography (ERCP), endoscopic ultrasound (EUS), interventional EUS, submucosal endoscopy, POEM/achalasia, endoscopic mucosal resection, endoscopic submucosal dissection, luminal stenting, large polyp resection and Barrett’s therapy, among others. Dr. Khashab is involved with multiple gastrointestinal societies and has served on many committees, including the ASGE Standards of Practice Committee, which is in charge of formulating guidelines for the practice of endoscopy. He has also served as an associate editor for the journal Endoscopy, a premier journal in the field. Khashab is a highly sought-after speaker at national and international conferences, and he has participated in multiple live endoscopy conferences. Outside of academic medicine, Dr. Khashab is an entrepreneur. His major interest is in new technology and medical devices, and his goal is to disrupt the field by introducing technology that makes endoscopic procedures safer, easier, efficient and more scalable. Dr. Khashab is rated as a Distinguished provider by MediFind in Colonoscopy. His top areas of expertise are Achalasia, Pancreatic Pseudocyst, Bile Duct Obstruction, Endoscopy, and Gastric Bypass.

An expert in foodborne and intestinal infections, Cynthia Sears is a professor of medicine and oncology at the Johns Hopkins University School of Medicine as well as a professor of molecular microbiology and immunology at the Bloomberg School of Public Health. She is the microbiome program leader of the Bloomberg~Kimmel Institute for Cancer Immunotherapy at Johns Hopkins and is director of the Johns Hopkins Germ-free Murine Facility. She is an infectious diseases expert who has focused on gut infections including diarrhea, foodborne illnesses Clostridium difficile (C. diff) and Helicobacter pylori during her career. In the laboratory and in clinical settings, she has studied the pathogenesis of enterotoxigenic Bacteroides fragilis (ETBF) over the past 25 years. The current focus of the Sears laboratory is to determine how the microbiota and specific bacteria contribute to colon carcinogenesis. The Sears laboratory integrates studies in humans and mouse models, employing microbiology, bioinformatics and immunologic methods. Dr. Sears has worked abroad in Thailand, Brazil, Haiti, Bangladesh and Malaysia. Dr. Sears served as associate editor of Clinical Infectious Diseases from 2000 to 2016. She has been an active member of the Infectious Diseases Society of America (IDSA) for more than 20 years, serving the society in numerous capacities, and is currently president of the organization. Dr. Sears received her medical degree from Thomas Jefferson Medical College followed by training in internal medicine at The New York Hospital (Cornell Medical School) in New York City. She trained in infectious diseases at the Memorial Sloan Kettering Cancer Institute and the University of Virginia. Dr. Sears joined the faculty at the Johns Hopkins University School of Medicine in 1988. Dr. Sears is rated as an Advanced provider by MediFind in Colonoscopy. Her top areas of expertise are Viral Gastroenteritis, Periodontitis, HIV/AIDS, Colonoscopy, and Endoscopy.

Gastroenterologist Saowanee Ngamruengphong specializes in the endoscopic diagnosis and management of gastrointestinal malignancies, premalignant and malignant lesions in the gastrointestinal tract (e.g., early gastric cancer, Barrett's esophagus-associated neoplasia), esophageal cancer, colon polyps or early colorectal cancer, and pancreatic and biliary disease. Dr. Ngamruengphong earned a medical degree from Chulalongkorn University and completed residency training at the Texas Tech University Health Sciences Center. She undertook fellowship training in gastroenterology at the Mayo School of Graduate Medical Education and further fellowship training in therapeutic endoscopy at The Johns Hopkins Hospital. Her research interests include endoscopic resection and the management of precancerous or cancerous gastrointestinal lesions. Dr. Ngamruengphong is a member of several professional organizations, including the Thai Medical Council, the American College of Gastroenterology and the American Gastroenterological Association. Videos Endoscopic Submucosal Dissection (ESD) — Eileen’s Story Recent News Articles and Media Coverage A Rare, Stomach-Saving Endoscopic Procedure, Inside Tract (Spring 2021) Case Presentation: ESD-TAMIS, Inside Tract (Spring 2019) Innovative Approaches to Colorectal Surgery Benefit Patients, Surgery (Winter 2019) For Colorectal Polyps: Early Detection and Minimally Invasive Endoscopic Resection, Inside Tract (Winter, 2019) The Cutting Edge of Endoscopic Resection, Inside Tract (Spring, 2017) Stomach Cancer: Know Your Risks & Treatment Options, Johns Hopkins Surgery (4/26/2017). Dr. Ngamruengphong is rated as an Advanced provider by MediFind in Colonoscopy. Her top areas of expertise are Achalasia, Pancreatic Pseudocyst, Stomach Cancer, Endoscopy, and Gastric Bypass.

Francis Giardiello is a Gastroenterologist in Baltimore, Maryland. Dr. Giardiello is rated as a Distinguished provider by MediFind in Colonoscopy. His top areas of expertise are Familial Adenomatous Polyposis, Juvenile Polyposis Syndrome, Attenuated Familial Adenomatous Polyposis, Colonoscopy, and Endoscopy.

Alexandra (Aly) Strauss is a transplant hepatologist who treats patients with acute and chronic liver disease, such as cirrhosis and liver cancer. Dr. Strauss completed medical school at the University of South Florida (USF), where she continued for internal medicine residency training and served as chief resident. She then went to The Johns Hopkins University for fellowship training in gastroenterology, followed by a fellowship in transplant hepatology. Her research training began when she completed a master’s degree in industrial/systems engineering at USF. Later, at the Johns Hopkins Bloomberg School of Public Health, she earned her Ph.D. in clinical investigation. Dr. Strauss’s research focus is on the use of systems engineering and data science to improve access to liver transplantation. She serves as core faculty in the Johns Hopkins University Malone Center for Engineering in Healthcare and is a faculty member in the Center for Data Science in Emergency Medicine. Recent News Articles and Media Coverage What Does AI Mean for GI, What does AI mean for GI? - American Gastroenterological Association (07/03/2023) Selected Publications Vong, Tyrus, Nicholas Rizer, Vedant Jain, Valerie L. Thompson, Mark Dredze, Eili Y. Klein, Jeremiah S. Hinson, et al. “Automated Identification of Incidental Hepatic Steatosis on Emergency Department Imaging Using Large Language Models.” Hepatology Communications 9, no. 3 (March 1, 2025). https://doi.org/10.1097/HC9.0000000000000638. Mankowski, Michal A., Sunjae Bae, Alexandra T. Strauss, Bonnie E. Lonze, Babak J. Orandi, Darren Stewart, Allan B. Massie, et al. “Generalizability of Kidney Transplant Data in Electronic Health Records - The Epic Cosmos Database vs the Scientific Registry of Transplant Recipients.” American Journal of Transplantation: Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons, November 15, 2024. https://doi.org/10.1016/j.ajt.2024.11.008. Xu, Jingzhi, Michal Mankowski, Karen B. Vanterpool, Alexandra T. Strauss, Bonnie E. Lonze, Babak J. Orandi, Darren Stewart, et al. “Trials and Tribulations: Responses of ChatGPT to Patient Questions about Kidney Transplantation.” Transplantation 109, no. 3 (March 1, 2025): 399–402. https://doi.org/10.1097/TP.0000000000005261. Strauss AT, Morgan C, El Khuri C, Slogeris B, Smith AG, Klein E, Toerper M, Peterson S, Gurses AP, DeAngelo A, Debraine, A, Levin S, Hinson J. Human-centered design and usability evaluation of LOOP, a patient outcomes-driven feedback platform for emergency medicine clinicians. JMIR Human Factors. 2022;9(1):e30130; *corresponding author. Strauss AT, Yeh J, Martinez D, Yanokyan G, Yoder J, Nehra R, Feller T, Bull-Henry K, Stein E, Hsu L, Al-Grain H, Zabko C, Fain C. A patient-centered framework for health systems engineering in gastroenterology: improving inpatient colonoscopy bowel preparation. BMC Gastroenterol. 2021;21(1):89;. Dr. Strauss is rated as an Experienced provider by MediFind in Colonoscopy. Her top areas of expertise are Hepatitis, Hepatitis C, Alcoholic Cirrhosis, Liver Transplant, and Endoscopy.

Dr. Nilofer S. Azad is Professor of Oncology at Johns Hopkins University School of Medicine and serves as the Associate Cancer Center Director for Clinical Research for the Johns Hopkins Sidney Kimmel Cancer Center. Dr. Azad earned her medical degree and completed a residency in internal medicine at Baylor College of Medicine in Houston, Texas. She then completed a fellowship in oncology and hematology at the National Institute of Health's National Cancer Institute in Bethesda, Maryland where she served as chief fellow. Dr. Azad’s research focused on early phase drug development and the intersection of moving exciting laboratory findings into patients for new treatment options Dr. Azad joined the faculty at the Kimmel Cancer Center in 2008. Dr. Azad’s clinical expertise is in cancers of the gastrointestinal tract, with a concentration in colorectal cancer, cholangiocarcinoma and pancreaticobiliary tract cancer. Her research efforts are dedicated to developing new drug combinations for patients with advanced cancer. In particular, Dr. Azad’s laboratory and clinical trials explore epigenetic therapy in combination with chemotherapy and immunotherapy to improve survival for patients, as well as molecularly targeted drugs. She is an active clinical trialist, leading multiple clinical trials of molecularly targeted agents for advanced cancer patients. Dr. Azad has received numerous grants for her work from entities such as the NCI (National Cancer Center), American Cancer Society, American Society of Clinical Research, Breakthrough Cancer Foundation, the Lustgarten Foundation, The Gateway Foundation, and the National Comprehensive Cancer Network, among others. She served as Principal for Johns Hopkins on the AACR Stand Up 2 Cancer Colorectal Cancer Dream Team and is a member of the Stand Up 2 Cancer Epigenetics Dream Team, leading the GI cancer initiatives for the group. Dr. Azad is a national leader in GI cancer, including serving as a member of the national NCI Colon Cancer Task Force and as Co-Chair of the Scientific and Medical Advisory Board for the Cholangiocarcinoma Foundation. She has a presidential appointment to the National Cancer Advisory Board. Dr. Azad is rated as an Experienced provider by MediFind in Colonoscopy. Her top areas of expertise are Cholangiocarcinoma (Bile Duct Cancer), Colorectal Cancer, Pancreatic Cancer, Hepato-Pancreato-Biliary Surgery, and Colonoscopy.

Maria Oliva is a Pediatric Gastroenterologist in Baltimore, Maryland. Dr. Oliva is rated as an Experienced provider by MediFind in Colonoscopy. Her top areas of expertise are Viral Gastroenteritis, Crohn's Disease, Hemorrhagic Proctocolitis, Gastrostomy, and Colonoscopy.

Sonia Dalal is a primary care provider, practicing in Internal Medicine in Baltimore, Maryland. Dr. Dalal is rated as an Experienced provider by MediFind in Colonoscopy. Her top areas of expertise are Sickle Cell Disease, Endoscopy, and Colonoscopy.

Chady Atallah is a General Surgeon in Baltimore, Maryland. Dr. Atallah is rated as an Advanced provider by MediFind in Colonoscopy. His top areas of expertise are Familial Colorectal Cancer, Colorectal Cancer, Anal Cancer, Colonoscopy, and Osteotomy.

John Affronti is a Gastroenterologist in Baltimore, Maryland. Dr. Affronti is rated as an Experienced provider by MediFind in Colonoscopy. His top areas of expertise are Childhood Volvulus, Portal Hypertension, Indigestion, Endoscopy, and Gastrectomy.

Dr. Daniel J. Brotman is a professor of medicine at the Johns Hopkins University School of Medicine. His areas of clinical expertise include hospital medicine and internal medicine. Dr. Brotman earned his M.D. at the University of Virginia School of Medicine. He completed his residency at Johns Hopkins. His research interests include hospital medicine, thrombosis and anticoagulation, perioperative medicine, care coordination, and readmissions He was recognized by the Maryland Chapter of the American College of Physicians with an Outstanding Hospitalist Award in 2012, has been named a Top Doctor (hospitalist) by Baltimore Magazine multiple times since 2011, is a Fellow of the American College of Physicians (ACP), a Master in Hospital Medicine, and a member of the Miller Coulson Academy of Clinical Excellence. Dr. Brotman is rated as an Experienced provider by MediFind in Colonoscopy. His top areas of expertise are Venous Thromboembolism (VTE), Deep Vein Thrombosis, Pulmonary Embolism, Endoscopy, and Colonoscopy.

Dr. Akshintala received his medical degree from the Andhra Medical College in India in 2011. Following this, he completed a post-doctoral research fellowship in Gastroenterology at Johns Hopkins Hospital where he established himself as a dedicated researcher. Dr. Akshintala completed his internship and residency training in Internal Medicine at the University of Pittsburgh Medical Center in 2016. He completed his fellowship in Gastroenterology at Johns Hopkins Hospital in 2019. Dr. Akshintala then completed additional fellowships in Advanced Endoscopy and Medical Pancreatology at the Johns Hopkins Hospital in 2021. As of July 1, 2021, Dr. Akshintala is an Assistant Professor of Medicine in the Division of Gastroenterology at Johns Hopkins Hospital. Dr. Akshintala’s research is focused on the medical as well as endoscopic evaluation and treatment of inflammatory disorders of the pancreas. He is also interested in developing new devices and technologies for the care of patients with gastrointestinal disorders. Dr. Akshintala has conducted multi-national randomized-controlled trials and has won numerous awards at major national and international conferences for his research. He also has authored more than 60 original articles, editorials, book chapters and review articles. Dr. Akshintala has received grant funding from the American Society for Gastrointestinal Endoscopy (ASGE) and the Maryland State to support his research. As an innovator, Dr. Akshintala has patented new therapies for gastrointestinal bleeding and pancreas necrosis, a complication of acute pancreatitis. An internationally recognized researcher conducting multi-national clinical trials, Dr. Akshintala holds an Adjunct Assistant Professor position at the Asian Institute of Gastroenterology in India, one of the largest gastroenterology hospitals in the world. Dr. Akshintala is a Ph.D. candidate with the Dutch Pancreatitis Study Group in the Netherlands, who have been pioneered landmark clinical trials related to pancreatitis. Dr. Akshintala offers in-person clinic visits at the Baltimore location and also provides telemedicine visits for patients located in Maryland, Washington, D.C. and Virginia. Dr. Akshintala is rated as an Experienced provider by MediFind in Colonoscopy. His top areas of expertise are Hereditary Pancreatitis, Acute Pancreatitis, Chronic Pancreatitis, Endoscopy, and Lithotripsy.

Dr. Craig Pollack is the Katey Ayers Endowed Professor in the Department of Health Policy and Management at the Johns Hopkins Bloomberg School of Public Health, the School of Nursing, and the School of Medicine. His area of clinical expertise is in internal medicine. He received his M.D. and completed his residency at the University of California San Francisco School of Medicine. He performed a fellowship at the University of Pennsylvania School of Medicine with the Robert Wood Johnson Foundation Clinical Scholars program. Dr. Pollack also earned an M.S. from the University of Pennsylvania and an M.H.S. from the University of California at Berkeley. Dr. Pollack is rated as an Experienced provider by MediFind in Colonoscopy. His top areas of expertise are Breast Cancer, Colorectal Cancer, Asthma, Tubal Ligation, and Colonoscopy.

Rebecca Brown is a General Surgeon in Baltimore, Maryland. Dr. Brown is rated as an Experienced provider by MediFind in Colonoscopy. Her top areas of expertise are Levator Syndrome, Diverticular Disease, Anal Fissure, Ureteroscopy, and Bladder Reconstruction.

Susan Gearhart is a General Surgeon in Baltimore, Maryland. Dr. Gearhart is rated as an Experienced provider by MediFind in Colonoscopy. Her top areas of expertise are Rectal Prolapse, Colorectal Cancer, Bowel Incontinence, Ileostomy, and Hernia Surgery.

Bharat Singh, M.D., joined CIMS in 2010. He has research interests in the management of patients with heart failure, including the use of implantable devices and predictors of acute decompensation, which can help avert recurrent hospital admission. Dr. Singh is a member of American College of Physicians. Dr. Singh is rated as an Experienced provider by MediFind in Colonoscopy. His top areas of expertise are Lymphangitis, Orthostatic Hypotension, Familial Neurocardiogenic Syncope, Colonoscopy, and Endoscopy.

Dr. Bull-Henry joins Johns Hopkins as a hospitalist specializing in small bowel imaging, including single balloon enteroscopy, double balloon enteroscopy and wireless video capsule endoscopy. In addition, she has a special interest in small bowel GI bleeding, innovation in medical education and the use of artificial intelligence to attain greater diagnostic efficiencies, to improve patient outcomes and to achieve cost savings. Dr. Bull-Henry is active in her research. She has also published papers, contributed to book chapters and written abstracts on related clinical topics. Dr. Bull-Henry is active in a number of professional societies and currently serves on the Board of Governors and as Chair of the Training Committee for the American College of Gastroenterology. Videos Double Balloon EnteroscopyFAQ with Dr. Bull-Henry. Dr. Bull is rated as an Advanced provider by MediFind in Colonoscopy. Her top areas of expertise are Angiodysplasia of the Colon, Gastroparesis, Painful Swallowing, Endoscopy, and Colonoscopy.

Eric Blum is a Gastroenterologist in Baltimore, Maryland. Dr. Blum is rated as an Advanced provider by MediFind in Colonoscopy. His top areas of expertise are Diverticular Disease, Familial Adenomatous Polyposis, Viral Gastroenteritis, Colonoscopy, and Endoscopy.

Anthony Kalloo is a professor of medicine with special interests in natural orifice translumenal endoscopic surgery, therapeutic endoscopy and sphincter of Oddi dysfunction. After receiving his medical degree at the University of the West Indies Medical School, Dr. Kalloo interned at Port of Spain General Hospital in Trinidad and performed his internal medicine residency at Howard University Hospital in Washington, D.C., where he was also chief resident. He completed fellowship training at the combined Georgetown University, Veterans Affairs Medical Center and National Institutes of Health program. Dr. Kalloo was an instructor of medicine at Georgetown University prior to joining the Johns Hopkins faculty in 1988. He was director of the Johns Hopkins Division of Gastroenterology and Hepatology from 2005–2020, and was an associate editor of Gastrointestinal Endoscopy. In 2009, Dr. Kalloo was recognized by the American Society for Gastrointestinal Endoscopy as the Distinguished Educator of the Year. In 2014, he received the Endoscopy Award from the German Society for Endoscopy for outstanding research and contribution in the field of endoscopy. In 2015, he received the BJ Vakil Oration from the Society of Gastrointestinal Endoscopy of India, which is bestowed on an international expert for his contribution to the field of gastrointestinal endoscopy. He has authored over 200 peer-reviewed publications and has more than 100 patents, including the use of botulinum toxin in the gastrointestinal tract, endoscopic cryotherapy and the winged biliary/pancreatic stent, as well as others related to natural orifice surgery. He is the pioneer of natural orifice translumenal endoscopic surgery, a technique that will enable abdominal surgery without the use of incisions. In 2015, he became a member of the inaugural chapter of the National Academy of Inventors at The Johns Hopkins University. This group represents the top 3% of all faculty inventors since 1969, and the top 1.5% of active Johns Hopkins faculty. Dr. Kalloo is a past panel chair for gastroenterology and urology devices with the United States Food and Drug Administration. He aims to advance the understanding, diagnosis, treatment and prevention of gastrointestinal and liver disease through patient care, education and research. Dr. Kalloo is rated as an Advanced provider by MediFind in Colonoscopy. His top areas of expertise are Hereditary Pancreatitis, Acute Pancreatitis, Achalasia, Endoscopy, and Gastrectomy.

Dr. Mullin is an associate professor of medicine at The Johns Hopkins University School of Medicine. Dr. Mullin has more than 30 years of clinical experience in the field of general gastroenterology. Dr. Mullin is a reviewer and also serves on the editorial board of numerous gastroenterology journals. Videos Hopkins at Home presents, A Woman's Journey: Is It Celiac Disease?. Dr. Mullin is rated as an Advanced provider by MediFind in Colonoscopy. His top areas of expertise are Small Bowel Bacterial Overgrowth, Diarrhea, Irritable Bowel Syndrome (IBS), Endoscopy, and Colonoscopy.