Gastroenterology

Doctors + Care Team

Sonia Friedman, MD

Sonia Friedman, MD

Accepting New Patients

Title(s): Chief of Gastroenterology at Tufts Medical Center
Professor of Medicine at Tufts University School of Medicine
Department(s): Medicine, Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Crohn's disease, ulcerative colitis

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Harmony Allison, MD

Harmony Allison, MD

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Virtual Appointments Available

Online Scheduling Available

Title(s): Gastroenterologist; Assistant Professor, Tufts University School of Medicine
Department(s): Medicine, Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Gastrointestinal motility, inflammatory bowel disease, general GI and endoscopy, diarrhea, constipation, celiac disease and limited liver function test abnormalities

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picture of Kaitlin Dresser, MS, RD, CSP, LC, CNSC

Kaitlin Dresser, MS, RD, CSP, LC, CNSC

Accepting New Patients

Title(s): Registered Dietitian II
Department(s): Gastroenterology, Gastroenterology/Hepatology, Frances Stern Nutrition Center
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

enteral and parenteral nutrition support, food allergies and sensitivities, motility disorders, inflammatory bowel disease, general GI

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Lauren D. Gaffny, MS, PA-C

Lauren D. Gaffny, MS, PA-C

Accepting New Patients

Online Scheduling Available

Title(s): Physician Assistant
Department(s): Medicine, Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

General gastroenterology

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Fredric D. Gordon, MD

Fredric D. Gordon, MD

Accepting New Patients

Title(s): Transplant Hepatologist and Professor of Medicine
Department(s): Transplant Surgery, Transplant Hepatology
Appt. Phone: 617-636-4886
Fax #: 617-636-1003

Liver Transplant, Hepatitis C, Hepatitis B, Portal Hypertension, Living Liver Transplantation, Hemochromatosis

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picture of Erik A. Holzwanger, MD

Erik A. Holzwanger, MD

Accepting New Patients

Title(s): Director of Endoluminal Surgery and Bariatric Endoscopy; Advanced Endoscopist; Assistant Professor of Medicine
Department(s): Advanced Endoscopy, Division of Gastroenterology and Hepatology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Esophageal Disease/GERD, Pancreaticobiliary Disease, Bariatric Endoscopy and Weight Loss, Gastrointestinal Cancers and Endoscopic Submucosal Dissection

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Sushrut Jangi, MD

Sushrut Jangi, MD

Accepting New Patients

Online Scheduling Available

Title(s): Gastroenterologist; Assistant Professor of Medicine, Tufts University School of Medicine
Department(s): Medicine, Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-9292

Gastroenterology, Inflammatory Bowel Disease

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Raffi Karagozian, MD

Raffi Karagozian, MD

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Accepting New Patients

Virtual Appointments Available

Online Scheduling Available

Title(s): Hepatologist; Program Director, Gastroenterology Fellowship Program; Assistant Professor, Tufts University School of Medicine
Department(s): Medicine, Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-4505

Abnormal liver tests, cirrhosis, non-alcoholic fatty liver disease, Hepatitis B/C, liver transplant, primary biliary cholangitis, primary sclerosing cholangitis, benign liver lesions, liver cancer, hemochromatosis, and drug induced liver injury.

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Joel B. Mason, MD

Joel B. Mason, MD

Accepting New Patients

Virtual Appointments Available

Title(s): Gastroenterologist; Professor, Tufts University Schools of Medicine and Friedman School of Nutritional Science and Policy; Senior Scientist and Director, Vitamins and Carcinogenesis Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University
Department(s): Medicine, Clinical Nutrition, Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Malabsorption and unintentional weight loss, Inflammatory bowel disease, nutritional aspects of gastrointestinal disease, home nutritional therapy, enteral and parenteral nutrition

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picture of Nikola Natov, MD

Nikola Natov, MD

Accepting New Patients

Title(s): Director of Endoscopy and Advanced Endoscopy, Attending Physician and Clinical Associate Professor of Medicine
Department(s): Medicine, Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Advanced Endoscopy, Gastroenterology, Diagnostic and therapeutic ERCP including biliary and pancreatic stone extraction, stenting, tissue acquisition, cholangioscopy, pancreatoscopy, electrohydraulic lithotripsy, radiofrequency ablation, and ampullectomy, Diagnostic and staging EUS, Interventional EUS including pseudocyst and walled-off necrosis drainage, fiducial placement, gallbladder drainage, EUS-guided biliary access, and endoscopic gastrojejunostomy, Management of dysplastic Barrett’s esophagus and early esophageal cancer with use of endoscopic mucosal resection and radiofrequency ablation, Endoscopic mucosal resection of large colon polyps and early cancers, Enteral stent placement, Single-balloon enteroscopy, Endoscopic full-thickness resection, Endo-hepatology including liver biopsy, portal pressure measurement, and treatment of gastric varices

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Miu Lai Ng, FNP, MPH

Miu Lai Ng, FNP, MPH

Accepting New Patients

Virtual Appointments Available

Online Scheduling Available

Title(s): Nurse Practitioner
Department(s): Gastroenterology, Hepatology
Appt. Phone: 617-636-5883
Fax #: 617-636-9292

Hepatitis B, Hepatitis C, Fatty liver diseases, autoimmune hepatitis, PSC, PBC, Cirrhosis”

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Lori B. Olans, MD, MPH

Lori B. Olans, MD, MPH

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Accepting New Patients

Virtual Appointments Available

Online Scheduling Available

Title(s): Gastroenterologist; Assistant Professor, Tufts University School of Medicine
Department(s): Medicine, Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-8615

General gastroenterology, inflammatory bowel disease

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Andrew G. Plaut, MD

Andrew G. Plaut, MD

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Accepting New Patients

Virtual Appointments Available

Online Scheduling Available

Title(s): Gastroenterologist; Professor, Tufts University School of Medicine
Department(s): Medicine, Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-4207

Gastroenterology, digestive diseases, gastrointestinal infections and parasitic disease, inflammatory bowel disease, diagnostic evaluation of unexplained pain or diarrhea

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picture of Roshan A. Razik, MD, MPH, FRCPC, FACG

Roshan A. Razik, MD, MPH, FRCPC, FACG

Accepting New Patients

Title(s): Gastroenterologist and Assistant Professor
Department(s): Gastroenterology, Gastroenterology & Hepatology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Hepatobiliary disease, Pancreatic disease, GI oncology, Liver disease, Peptic ulcers, Colon cancer screening, IBD, GI bleeding, Esophageal disorders, H. pylori infection, Hepatitis C, Pancreatic cancer, Gallstone disease

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Ann Shum, DNP, AGPCNP-BC

Ann Shum, DNP, AGPCNP-BC

Accepting New Patients

Title(s): Nurse Practitioner
Department(s): Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Gastroenterology, Inflammatory Bowel Disease

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Kathryn Stiff, MSN

Kathryn Stiff, MSN

Accepting New Patients

Title(s): Nurse Practitioner
Department(s): Gastroenterology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

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picture of Xiaocen Zhang, MD

Xiaocen Zhang, MD

Accepting New Patients

Title(s): Gastroenterologist and Assistant Professor
Department(s): Gastroenterology, Gastroenterology and Hepatology
Appt. Phone: 617-636-5883
Fax #: 617-636-1480

Upper endoscopy, colonoscopy, colon polyp removal, esophageal varices, intestinal bleeding, hereditary colon cancer syndrome, reflux disease, irritable bowel syndrome, diarrhea, constipation, trouble swallowing, abdominal pain, portal hypertension, abnormal liver test, cirrhosis, hepatitis

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