Appointments 425.454.5046

Our Gastroenterology (GI) physicians have been named to the “Top Doctors” list by Seattle Met and Seattle Magazine as well as Castle Connolly. Dr. Kalle Kang has also been named to the “Best Doctors of America” list by the Boston-based group, Best Doctors, Inc.. This honor places him among the best five (5) percent of doctors in the Gastroenterology specialty nationally. The list surveys doctors and asks them the question, “If you or a loved one needed a doctor in your specialty, to whom would you refer?”

Coupled with our favorable Angie’s List ratings, our friendly team of GI physicians and staff promise to make your experience at our Gastroenterology practice a positive one.

Raj C. Butani, M.D.

Butani (112).05.14ACCEPTING NEW PATIENTS: Yes. Dr. Raj Butani was born and raised in New Jersey and attended Lehigh University in Pennsylvania, where he completed an accelerated six-year B.A/M.D. combined-degree program with the Medical College of Pennsylvania (now part of Drexel University College of Medicine). Following graduation from medical school, he spent the next six years completing his Internal Medicine residency and Gastroenterology fellowship at Brooke Army Medical Center in San Antonio, Texas. During this time, his accolades included an award for his outstanding teaching of medical students, the Outstanding Ambulatory Care Award and the Commander’s Award for best original medical research by a graduating trainee.

Following the completion of his training in 2002, Dr. Butani spent five years at Tripler Army Medical Center in Honolulu, Hawaii, where he served as Assistant Chief of Gastroenterology. During this tour, he also performed a one-year overseas deployment to Ramadi, Iraq, where he received the Combat Medical Badge and Bronze Star Medal for his service and performance. Following completion of his deployment duties, he was appointed as a Clinical Instructor at the University of California, San Francisco (UCSF) and he completed advanced training in Gastroenterology at the UCSF-San Francisco General Hospital in 2006. In 2007, Dr. Butani completed his Army service in Hawaii, relocated to the Seattle area and began work at Overlake Internal Medicine Associates in September.

Dr. Butani is Board Certified in Gastroenterology and has been published in well-known peer review medical journals, to include the American Journal of Gastroenterology. He is a Fellow of the American College of Physicians. In addition, he is a member of the American Medical Association, American College of Gastroenterology, American Gastroenterological Association, American Society for Gastrointestinal Endoscopy, and the American Association of Physicians of Indian origin. Dr. Butani is married and has two sons. He is able to speak some Sindhi, Spanish and Hindi. In his spare time, he enjoys travel, running, 80’s music, and spending time with his family and friends. He is excited about his relocation to the Seattle metro area and looks forward to providing high-quality health care to his patients.

Kalle Kang, M.D.

Kang (181).05.14ACCEPTING NEW PATIENTS: Yes. Dr. Kang graduated from Massachusetts Institute of Technology and received his medical degree from New York University. After spending three years at University of Michigan for Internal Medicine internship/ residency and another three years at University of Minnesota for Gastroenterology/Hepatology fellowship, he taught at the University of Connecticut medical school for three years.

He then moved to the Northwest and joined Overlake Internal Medicine Associates. He has been with the practice since 1987. He considers this the best career choice he has ever made and is looking forward to participating in the care of many more patients to come.

His outside interests are like all weekend warriors, keeping his body and soul together until the parts wear out.

Dr. Kang currently serves as President of Overlake Internal Medicine Associates.

Sang U. Kim, M.D.

Kim (241).05.14ACCEPTING NEW PATIENTS: Yes. Sang U. Kim M.D., joined Overlake Internal Medicine Associates in 2001. Dr. Kim was born in South Korea and immigrated to the United States as a young boy. He received his undergraduate degree in Electrical Engineering from University of Washington. Then, he received his Doctor of Medicine from University of Washington. He completed his Internal Medicine residency and Gastroenterology fellowship from University of Washington Medical Center and affiliated hospitals, including Fred Hutchinson Cancer Research Center.

He sees patients in all areas of gastroenterology. His interests include: colon cancer screening, reflux disease, Barrett’s esophagus, dyspepsia, H. pylori, gastric cancer prevention and early detection, inflammatory bowel disease, liver diseases, hepatitis B and C, and endoscopic mucosal resections. He is also fluent in Korean. He enjoys golf, skiing, hiking, soccer, music of various genre, and variety of ethnic food.

He enjoys caring for his patients, one patient at a time, with competence and compassion.

Georgia Rees-Lui, M.D.

Rees-Lui (219).05.14ACCEPTING NEW PATIENTS: Yes. Dr. Rees-Lui attended the University of Utah for both her undergraduate education and medical school. She did her Internal Medicine residency at the University of Connecticut, before moving to Seattle for her Gastroenterology fellowship at the University of Washington. After completing her training, she briefly moved to the Midwest where she was on the faculty at the University of Nebraska Medical Center for two years before returning to the Northwest to pursue clinical practice. After three years at Group Health Eastside, she joined Overlake Internal Medicine Associates in 1996.

Dr. Rees-Lui is board certified in Internal Medicine and Gastroenterology. She is a member of both the  American Gastroenterological Association and the American College of Gastroenterology, as well as the American Society for Gastrointestinal Endoscopy.

Dr. Rees-Lui is married and has three children who happily consume every moment of her spare time.


Eric Yap (compressed)Eric Yap, M.D.

ACCEPTING NEW PATIENTS: Yes.  A long-time resident of Bellevue, Dr. Yap is proud to be serving the Overlake medical community and hospital where his three children were born. Board certified in gastroenterology since 2000, he grew up in the Chicago-land area studying classical violin before enrolling in Brown University’s eight-year Program in Liberal Medical Education where he completed degrees in both history and medicine. His undergraduate education included a term studying philosophy at the University College of London.  

Upon graduating, Dr. Yap trained at Columbia University’s Presbyterian Hospital in New York City, where he completed his residency in Internal Medicine. He finished his Fellowship training in Gastroenterology at Stanford University before moving to the Pacific Northwest in 2000.

His clinical interests include general gastroenterology, colon cancer screening, and exploring the psychological impact of traumatic events as they relate to the digestive system. He has a compassionate approach to the treatment and care of all individuals. 

Outside of work, Dr. Yap loves spending time with his family. On weekends, he will often be seen driving his kids around town to soccer matches. He enjoys music, cooking, snowboarding, and rooting for our local sports teams. 


Our physicians stay up-to-date in their field and are proud members and supporters of the following professional organizations:

ABIM – American Board of Internal Medicine
ACG – American College of Gastroenterology
AGA – American Gastroenterology Association
ASGE – American Society of Gastroenterology Endoscopy