MediFind found 5 doctor with experience in Gallbladder Disease near Lewistown, PA. Of these, 3 are Advanced and 2 are Experienced.
Geisinger Lewistown - Gastroenterology
Dr. Abdulsamad is a board-certified and fellowship-trained gastroenterologist. His clinical interests include general gastroenterology, liver disease, and endoscopic retrograde cholangiopancreatography (ERCP). Dr. Abdulsamad earned his medical degree from Jordan University of Science and Technology. He completed his residency and fellowship at Bronx-Lebanon Hospital Center. Dr. Abdulsamad is certified by the American Board of Internal Medicine in gastroenterology. He speaks English, Arabic and German. Dr. Abdulsamad is rated as an Advanced provider by MediFind in the treatment of Gallbladder Disease. His top areas of expertise are Familial Pancreatic Cancer, Pancreatic Cancer, Choledocholithiasis, Endoscopy, and Colonoscopy.
Geisinger Lewistown - Gastroenterology
Dr. Duncan is a board-certified and fellowship-trained gastroenterologist. His clinical interests include endoscopic ultrasound and endoscopic retrograde cholangiopancreatography (ERCP). Dr. Duncan obtained his medical degree from the Western University of Health Sciences College of Osteopathic Medicine of the Pacific. He completed his residency at Madigan Army Medical Center, a fellowship in gastroenterology at Walter Reed Army Medical Center and another fellowship in hepatology and endoscopic ultrasound at the University of Maryland Medical Center. Dr. Duncan is certified by the American Board of Internal Medicine in gastroenterology. Dr. Duncan is rated as an Advanced provider by MediFind in the treatment of Gallbladder Disease. His top areas of expertise are Choledocholithiasis, Bile Duct Obstruction, Gallstones, Endoscopy, and Gastrectomy.
Geisinger Lewistown - General Surgery
Dr. Anderson is a board-certified general surgeon and fellowship-trained minimally invasive surgeon. His clinical interests include minimally invasive surgery, breast surgery, abdominal surgery and endocrine surgery. Dr. Anderson attended Thomas Jefferson University, where he earned his degree in medicine. He completed his residency at York Hospital and his fellowship at Hershey Medical Center. Dr. Anderson is certified by the American Board of Surgery. Dr. Anderson is rated as an Advanced provider by MediFind in the treatment of Gallbladder Disease. His top areas of expertise are Paget Disease of the Breast, Breast Cancer, Familial Colorectal Cancer, Hernia Surgery, and Endoscopy.
Geisinger Lewistown - General Surgery
Alanna Gretschel, DO, is a general surgeon specializing in breast surgery. She provides a wide range of breast care and breast procedures, including breast cancer surgery, surgical treatment for dense breasts and breast cysts, and care for benign breast conditions such as mastitis, non-cancerous breast lumps, nipple discharge and breast itchiness.|Dr. Gretschel also provides various surgical services including hernia repair, appendectomies and colon cancer surgery. Additionally, she offers treatment for pilonidal cysts and abscesses, gallbladder disease, anorectal conditions and skin lesions, catheter insertion, temporal artery biopsy and second surgical opinions.|She has a clinical interest in the SAVISCOUT® procedure, an advanced treatment for breast biopsy, tumors and lymph nodes. Dr Gretschel is able to perform robotically assisted surgery at Geisinger Lewistown Hospital for the most minimally invasive surgeries possible.|Dr. Gretschel earned her Doctor of Osteopathic Medicine from the New York College of Osteopathic Medicine in Old Westbury, NY, followed by a general surgery residency at Geisinger Wyoming Valley Medical Center in Wilkes-Barre.|In 2019, Dr. Gretschel received the Joseph J. Stella Award for Excellence in General Surgery.|In her free time, she enjoys traveling, skiing and theater.|Video: more from Dr. Alanna Gretschel, D.O. Dr. Gretschel is rated as an Experienced provider by MediFind in the treatment of Gallbladder Disease. Her top areas of expertise are Ogilvie Syndrome, Gallstones, Choledocholithiasis, and Gallbladder Disease.
Edward Ridings is a General Surgeon in Lewistown, Pennsylvania. Dr. Ridings is rated as an Experienced provider by MediFind in the treatment of Gallbladder Disease. His top areas of expertise are Familial Colorectal Cancer, Hernia, Gallstones, Choledocholithiasis, and Gastrostomy.
Last Updated: 01/09/2026