Clinicians & Administrators

Meet our Clinicians

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Digestive Health Associates, PC & DHA Endoscopy Physicians

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Fehmida A. Chipty, MD

91 Montvale Avenue
Suite 206
Stoneham, MA 02180
Ph: (781) 404-4178
Fax: (781) 438-3751

Dr. Chipty received her BA in Biochemistry and Political Science at Wellesley College and her MD at the University of Massachusetts Medical School. She completed her residency and fellowship at the Albert Einstein Medical Center, Montefiore, and Hospital. Dr. Chipty is board certified in Gastroenterology. She joined Digestive Health Associates in 1998 and her general GI practice interests include colorectal cancer screening, reflux disease, chronic constipation and Inflammatory Bowel Disease.

Make an appointment with Dr. Chipty here

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David S. Fefferman, MD

91 Montvale Avenue
Suite 206
Stoneham, MA 02180
Ph: (781) 665-3380
Fax: (781) 665-8288

Dr. Fefferman graduated with honors and received his MD from Jefferson Medical College in Philadelphia and then went on to complete his Internal Medicine training at Brown University School of Medicine's Rhode Island and Miriam Hospital. Dr. Fefferman subsequently completed his Gastroenterology and Advanced Endoscopy training at Harvard Medical School's Beth Israel Deaconess Medical Center. Dr. Fefferman has assisted in teaching Gastroenterology at Harvard Medical School and is a Clinical Instructor in Medicine. He has authored multiple articles and chapters for medical journals and textbooks. Dr. Fefferman joined Digestive Health Associates in 2005 and is board certified in Gastroenterology. Dr. Fefferman's clinical interests include colon cancer screening and prevention, Inflammatory Bowel Disease, Irritable Bowel Syndrome, esophageal disorders, as well as treating diseases of the liver and pancreas. He has additional training in therapeutic endoscopic procedures including ERCP.

Make an appointment with Dr. Fefferman here

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Sanjay R. Hegde, MD

91 Montvale Avenue
Suite 206
Stoneham, MA 02180
Ph: (781) 391-8015
Fax: (781) 835-2192

Dr. Hegde received his MD from Tufts University School of Medicine. His post-graduate training includes internship and residency training in Internal Medicine at Tufts Medical Center and Gastroenterology Fellowship Training at the University of Pennsylvania. His Advanced Endoscopy Fellowship was at Fox Chase Cancer Center in Philadelphia, PA. He has been on the faculty of the Gastroenterology Division at the University of Maryland Medical Center and in the Gastroenterology Division at Tufts Medical Center where he served as EndoscopyUnit Director. His areas of clinical interest and expertise are Advanced Therapeutic Endoscopy including Endoscopic Ultrasound (EUS), Endoscopic Retrograde Cholangiopancreatography (ERCP), removal of large colonic polyps, Argon Plasma Coagulation Therapy and General Gastroenterology. Dr. Hegde joined Digestive Health Associates and DHA Endoscopy in September 2016.

Make an appointment with Dr. Hedge here

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Eric Libby, MD

91 Montvale Avenue
Suite 206
Stoneham, MA 02180
Ph: (781)-729-5855
Fax: (781)-721-5891

Dr. Libby received his BA in genetics from the University of California, Berkeley, and his MD from Harvard Medical School. His post-graduate training includes internship, residency and chief residency in Internal Medicine at the University of California, San Francisco, and fellowship in Gastroenterology at Duke University Medical Center. He is currently board certified in Gastroenterology. After working as Assistant Professor of Medicine and Associate Director of Endoscopy at Tufts University Medical Center, he joined the staff at Digestive Health Associates, Winchester Hospital and Hallmark Health. He has served on the board of the New England Endoscopy Society and is past Medical Director for the Winchester Ambulatory Care Unit and the Winchester Hospital Endoscopy Center.  Dr. Libby is a member of the American College of Gastroenterology and the American Society for Gastrointestinal Endoscopy.

Make an appointment with Dr. Libby here

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Xi Na, MD, PhD

91 Montvale Avenue
Suite 206
Stoneham, MA 02180
Ph: (781) 729-5822
Fax: (781) 438-5802

Dr. Na is board certified in Internal Medicine and Gastroenterology. Dr. Na received her medical degree with top honors from Peking University Health Science Center, the most selected and respected medical school in China. She subsequently came to the U.S. and earned her Ph.D. degree in pathology from the University of Rochester School of Medicine and Dentistry. She went on to complete her medical internship and residency and serve as chief medical resident in Internal Medicine at the Mount Sinai School of Medicine in New York. Dr. Na then attended Harvard Medical School's Beth Israel Deaconess Medical Center, where she received her specialty degree in Gastroenterology. Dr. Na has published multiple articles in top medical journals; presented numerous papers, and received prestigious awards at national and international conferences. Dr. Na provides highly personal and excellent care for her patients' digestive health and well-being. Dr. Na manages a wide range of gastroenterology conditions, including colon cancer screening, Crohn's Disease and Ulcerative Colitis, Irritable Bowel Syndrome and diseases of the esophagus, stomach, liver, and pancreas.

Make an appointment with Dr. Na here

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R.A. Muggia, MD

91 Montvale Avenue
Suite 206
Stoneham, MA 02180
Ph: (781) 391-5525
Fax: (781) 438-3715

Dr. Muggia grew up in the Winchester area, attended school locally and started his practice in 1990. His father started his local GI practice in 1965 and they worked together for 15 years. He is the Chief of Gastroenterology at the Winchester Endoscopy Center , a Specialist Medical Director for the Highland Healthcare Associates IPA and the President of Digestive Health Associates and DHA Endoscopy. He received his MD from Tufts Medical School, completed three years of Internal Medicine residency at Duke University in North Carolina, three years of Fellowship at Harvard University's Beth Israel Deaconess Medical Center and an advanced interventional year at Maine Medical Center. Dr. Muggia sees patients with any GI concerns or needs. Digestive Health Associates can handle most all GI issues and we have colleagues at all the local tertiary centers. 
Article - Doctor Deals a Life Saving Hand

Make an appointment with Dr. Muggia here

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Jose Marcal, MD

91 Montvale Avenue
Suite 206
Stoneham, MA 02180
Ph: (781) 665-3380
Fax: (781) 665-8288

Dr. Marcal received his BA from Hamilton College, and his MD from Columbia University, NYC. His Internal Medicine training included Internship, Residency, and Chief Residency at Columbia-Presbyterian Hospital, NYC. He then completed a Gastroenterology Fellowship at Yale-New Haven Hospital, CT. He is board certified in Gastroenterology and in Internal Medicine. Dr. Marcal started his private practice in Gastroenterology and Hepatology in Stoneham in 1982. He served as Chief of Gastroenterology at New England Memorial Hospital in Stoneham from 1985-1990, and as Chairman of the Department of Internal Medicine from 1990-1995.  He joined Digestive Health Associates in 2000, and still holds a teaching position at Boston University School of Medicine, with medical students rotating into his practice all year.  He was named "Best in Boston" by Boston Magazine for Internal Medicine (1999) and for Gastroenterology (2000, 2001, 2011-2015, 2017). Dr Marcal also speaks Cantonese, Portuguese, Spanish, and French. His hobbies include road cycling in good weather and skiing in the winter.

Make an appointment with Dr. Marcal here

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William Vanneman, MD

91 Montvale Avenue
Suite 206
Stoneham, MA 02180
Ph: (781) 729-5855
Fax: (781) 721-5891

Dr. Vanneman received his MD from Albany Medical College. His training includes Internship at San Francisco General Hospital, Residencies at Albany Medical Center and Boston City Hospital and Fellowship at Boston University-Boston City Hospital. After training, Dr. Vanneman remained in full-time academic medicine at Boston University and was Chief of Endoscopy at Boston City Hospital until he joined the Winchester Endoscopy Center Staff. He served as Chief of Gastroenterology and Endoscopy at Winchester Endoscopy Center and Lawrence Memorial Hospital. In 2011, Dr. Vanneman was named a "Top Doctor" by US News and World Reports. His major clinical interests include swallowing disorders, inflammatory bowel disease, colon polyps and cancer, and liver problems. Dr. Vanneman enjoys flying his Cessna airplane, skiing and world travel.

Make an appointment with Dr. Vanneman here

DHA Endoscopy Physicians/Surgeons

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David Siegenberg, MD

Dr Siegenberg is originally from South Africa, where he went to medical school at the University of Witwatersrand in Johannesburg. He moved to Boston to further his studies and completed his Internal Medicine residency and Gastroenterology fellowship at Boston University Medical Center.

Dr Siegenberg has been in private practice on the north shore since 1995. He sees patients for gastroenterology consultations at his office in Reading, MA and performs upper and lower endoscopy at the DHA endoscopy center in Stoneham and at the Winchester Hospital. He has same day appointments available for urgent consultations.

Midlevel Clinical Staff

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Matthew McDonald, P A-C

91 Montvale Avenue
Suite 206
Stoneham, MA 02180
Ph: (781) 518-9050
Fax: (781) 518-9051

Mr. McDonald received his Bachelor's degree in Health Sciences from Springfield College and then graduated magna cum laude with his Master's Degree in Physician Assistant Studies at Springfield College. Mr. McDonald is certified by the National Commission on Certification of Physician Assistants and is a member of both the American Academy of Physician Assistants and the Massachusetts Association of Physician Assistants. Mr. McDonald joined DHA in 2012. He primarily works in Winchester Endoscopy Center performing inpatient consultations, and also spends time as an outpatient provider. His clinical interests include all areas of gastroenterology and PEG-tube placements.

Linda Corey, NP

91 Montvale Avenue
Suite 206
Stoneham, MA 02180
Ph: (781) 665-3380
Fax: (781) 665 82881

Ms. Corey received her Master of Science degree in Nursing/NP from Simmons College in 2001 and is a board-certified Adult Nurse Practitioner. She has been a Registered Nurse since 1981. Ms. Corey joined DHA in 2001. Her clinical work experience includes Boston Regional Medical Center and Winchester Endoscopy Center . Ms. Corey's primary focus is the treatment of Hepatitis C. Ms. Corey coordinates care for Hepatitis C patients from all of the Digestive Health Associates offices, as well as assisting with procedures performed at DHA Endoscopy.

Make an appointment with Linda here

Meet Our Administrators

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Administrative Staff