Colorectal Program

Daniel A. Ng, MD

Dr. Daniel Ng is a colon and rectal surgeon in Newport Beach, California. He received his medical degree from University of California Davis School of Medicine and has been in practice for more than 20 years.

William Oh, MD

William Oh, M.D., F.A.C.S., F.A.S.C.R.S. is double board certified in general surgery as well as colon and rectal surgery. He attended Cornell University’s College of Human Ecology, receiving his bachelor’s degree in human biology, health and society with a concentration in gerontology. He developed an interest in geriatric medicine and went to New York Medical College to obtain his medical degree. During his surgery rotation, Dr. Oh’s plans shifted to becoming a surgeon after observing the on-call surgical team perform an operation on a young patient experiencing acute appendicitis. Once he saw the patient walk out of the hospital, he felt the joy that comes from directly helping a patient utilizing surgery. Dr. Oh completed his general surgery residency at UCSF-Fresno in Fresno, CA, where he developed a special interest in the disease of the colon and rectum. During his time at UCSF-Fresno, he was honored with multiple awards including UCSF Fresno Steven N. Parks Golden Scalpel Award for Outstanding Senior Resident and UCSF Fresno Resident Excellence in Teaching Award. Following his residency, he pursued a colon and rectal surgery fellowship at Indiana University in Indianapolis, IN, with extensive emphasis on minimally invasive surgical techniques using laparoscopy and the da Vinci® Xi robot. His expertise with the da Vinci® Xi robot has helped patients with colon cancer, rectal cancer, inflammatory bowel disease and rectal prolapse. He is also passionate about managing benign anorectal diseases such as hemorrhoids, anal fissure and anal fistula. Dr. Oh is a member of the American Society of Colon and Rectal Surgery, American College of Surgeons and American Medical Association. He has authored publications and delivered numerous presentations focused on a variety of topics including management of hemorrhoids and anal fissures, laparoscopic colectomies, benign anorectal diseases and enhanced recovery after surgery protocol to name a few.

Babak N. Rad, MD

Babak (Bobby) Rad, M.D., is a colon and rectal surgeon at Hoag Family Cancer Institute. He treats the full spectrum of anorectal (hemorrhoids, anal fissures, fistulas) and colon diseases (colon cancer, diverticular disease) and is especially interested in the treatment of colon and rectal cancer. Dr. Rad is a strong proponent of and advocate for the use of robotic surgery and minimally invasive techniques for treating colorectal cancer and is involved in clinical research through Hoag Family Cancer Institute. Dr. Rad earned the Orange County Physician of Excellence Award in 2021, 2023 and 2024. Dr. Rad graduated from the University of Southern California with a B.S. in biological sciences in 1991. After obtaining his medical degree from the Medical College of Pennsylvania in 1995, he completed a general surgery residency at the University of Medicine & Dentistry of New Jersey in 2000 where he was administrative chief resident and was awarded the Golden Apple teaching award twice. He then pursued additional fellowship training in colon and rectal surgery at the University of Southern California. Dr. Rad is dual-board certified in general and colorectal surgery, although his practice is limited to the specialty of colon and rectal surgery. He is a Fellow of the American College of Surgeons and a Fellow of the American Society of Colon and Rectal Surgeons. Dr. Rad has been practicing in Orange County/Newport Beach since 2001. In his spare time, he enjoys spending time with his family, working out, reading, traveling and Formula 1 racing.

Elizabeth R. Raskin, MD

Elizabeth R. Raskin, M.D., is Surgical Director for the Margolis Family Inflammatory Bowel Disease (IBD) Program within the Digestive Health Institute at Hoag. A colorectal surgeon with approximately 20 years of experience advancing state-of-the-art technologies and innovative surgical techniques, Dr. Raskin understands the importance of how medical care is delivered and provides cutting-edge, comprehensive care to provide better surgical treatment and improved patient recovery. Specializing in the treatment of complex colon, rectal and anal conditions, including laparoscopic and robot-assisted surgical techniques, Dr. Raskin believes we must use our experience, instinct and imagination to reach beyond traditional boundaries to pave the way for better healthcare today and tomorrow. Skilled in minimally invasive surgery, she has a keen interest in examining how robotic surgery and developing technologies can improve patient treatment options and outcomes. As a researcher, Dr. Raskin has specific interests in IBD, complex diverticular disease, and ostomy creation and care. She has written and contributed to numerous peer-reviewed publications and textbooks and has presented multiple national and international lectures on a wide array of colorectal topics. Dr. Raskin lectures, teaches and trains surgeons of all levels, allied health representatives and industry on robotics. As a perpetual student, Dr. Raskin is uniquely interested in energy medicine and functional healing as an adjunct to surgical care.

Kenneth J. Chang, MD

Executive Medical Director, Hoag Digestive Health Institute

Jennifer Phan, MD

Medical Director, Hoag Irvine Advanced Endoscopy, Director of Bariatric Endoscopy, Gastroenterologist

Ravi J. Kankotia, MD

Dr. Kankotia is a board-certified gastroenterologist at the Hoag Digestive Health Institute. His focus is in advanced endoscopic procedures, and his clinical interests include pancreaticobiliary disease, tissue resection, Barrett’s esophagus, and bariatrics. Other services offered include luminal stenting, radiofrequency ablation, endoscopic mucosal resection, esophageal pH monitoring (Bravo), liver biopsy, portal pressure measurement, and endoscopic suturing. He strives to provide his patients and their families with personalized care plans that help each patient reach their health goals. At the Hoag Digestive Health Institute, Dr. Kankotia works with a team of digestive health experts to provide a comprehensive approach to wellness. Dr. Kankotia earned his medical degree at the Keck School of Medicine of the University of Southern California in Los Angeles. He completed internal medicine residency and gastroenterology fellowship at University of Southern California/LAC+USC Medical Center. He then completed an additional fellowship in advanced endoscopy at the University of Michigan in Ann Arbor, where he developed expertise in ERCP (endoscopic retrograde cholangiopancreatography), diagnostic and therapeutic EUS (endoscopic ultrasound), and other techniques while garnering experience managing complex cases. Dr. Kankotia is a current member of the American College of Gastroenterology, American Gastroenterological Association, and American Society for Gastrointestinal Endoscopy. Additionally, he has contributed to several publications on topics such as gastric cancer, biliary disease, pancreatic cysts, and luminal strictures.

Paul J. Korc, MD

Paul J. Korc, M.D. serves as medical director of the Hoag GI Lab and is a board-certified gastroenterologist with fellowship training in advanced endoscopic procedures. After completing his residency and fellowship at USC, he went on to spend a year at Indiana University, one of the nation’s top programs for biliary and pancreatic disorders. There, he received training in endoscopic retrograde cholangiopancreatography (ERCP) and endoscopic ultrasound (EUS), gaining extensive experience in the management of complex cases. Dr. Korc’s expertise also includes removal of large polyps and early stage cancers of the gastrointestinal tract, using endoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD). He spent time in Seoul, Korea learning ESD, a cutting-edge technique in which pre-cancerous lesions and superficial cancers are removed en bloc (in one piece), avoiding the need for surgery. Additionally, Dr. Korc performs peroral endoscopic myotomy (POEM), a specialized procedure that restores the ability to eat and drink for people with achalasia, an esophageal motility disorder. Dr. Korc brings to Hoag his expertise in these procedures, some of which are available at only a handful of medical centers in Southern California. Dr. Korc offers patients compassionate, personalized care along with the very best advances in endoscopic treatment.

Phuong T. Nguyen, MD

Medical Director of Hoag Advanced Endoscopy Center, Gastroenterologist

Hali Pham, NP-BC

Nurse Practitioner

David R. Braxton, MD

Craig A. Cox, MD

Peter V. Chen, MD

Brian S. Kim, MD

Kevin Lin, MD

Shane A. Lloyd, MD

Carlos R. Becerra, MD

Medical Director of Cancer Research for Hoag Family Cancer Institute

Tara E. Seery, MD

<p>Tara Seery, M.D., attended University College Dublin School of Medicine followed by an internship at Mater Misericordiae Hospital as well as an internship and residency at Caritas St. Elizabeth Medical Center in Boston. She then completed fellowships in hematology/oncology at both Caritas St. Elizabeth Medical Center and University of Illinois at Chicago. Dr. Seery is board certified in Medical Oncology and Hematology.</p><p>Dr. Seery is particularly interested in GI oncology, including hepatobiliary cancers such as pancreatic, liver and bile duct cancers.</p><p>She has served as the primary investigator on several clinical research trials, co-authored numerous medical publications and abstracts, and edited multiple peer-reviewed journals. Additionally, she has given clinical presentations both across the U.S. and abroad. </p><p>Dr. Seery’s teaching experience spans the areas of medical and graduate level courses including a Hematology/Oncology Fellowship Annual Lecture Series on Pancreatic Cancer, Liver Cancer and the Management of Unresectable Hepatocellular Carcinoma at UC Irvine’s 5th Annual Gastroenterology and Hepatology Symposium. In addition, she oversaw a group of Hematology/Oncology Fellows at the University of California Irvine Outpatient Clinic.</p><p>Dr. Seery is a member of the American Society of Clinical Oncology and the American Society of Hematology.</p>

Kim DeLiema, LCSW

Digestive Health Therapist

Chelsea Honrath, RDN

Registered Dietitian