Meet Our Doctors


Meet Our Doctors

Dr. Ah LoyRon Ah Loy, M.D, AFAG, FACP

Big Island native, Dr. Ron Ah Loy is the owner and CEO of Big Island Gastroenterology and Endoscopy Center. Dr. Ah Loy received his Doctor of Medicine from the University of Hawaii’s John A. Burn’s School of Medicine in 1978. After completing his residency in Internal Medicine and Fellowship in Infectious Disease, Dr. Ah Loy returned to his hometown of Hilo where he established a private practice in Internal Medicine and Infectious Diseases.

After six years in private practice, Dr. Ah Loy decided to make a career change. He completed a two-year Fellowship in Gastroenterology at the University of California at San Diego from 1990 to 1992. Dr. Ah Loy immediately returned home to the Big Island, establishing his permanent address in Waimea, specializing in Gastroenterology.

Dr. Ah Loy has been in practice on the Big Island since 1983 and has been specializing in Gastroenterology since 1992. He is Board Certified in Internal Medicine, Infectious Disease, and Gastroenterology. He is a member of the Hawaii Medical Association, American College of Gastroenterology, American Gastroenterological Association, American Association of Ambulatory Surgery Centers, and American Society of Gastrointestinal Endoscopy.

Dr. Ah Loy and his wife Marva have seven children and thirteen grandchildren. He enjoys surfing, swimming, playing the guitar, working on his ranch, and playing with his grandkids.

Doctor Ah Loy's Certification


Dr. KimballMichael W. Kimball, M.D., FACP, FACG

Dr. Michael Kimball serves as a Gastroenterology Consultant for Big Island Gastroenterology, providing services in consultative gastroenterology. With his extensive knowledge and experience in quality of care management and improvement, Dr. Kimball also acts as Medical Director for Big Island Endoscopy Center, LLC.

Dr. Kimball is Board Certified in both Internal Medicine and Gastroenterology. He is a Fellow of the American College of Physicians and the American College of Gastroenterology. Dr. Kimball is one of the early members of the American Society of Gastrointestinal Endoscopy. He has served as Chief of staff and Head of the Department of Medicine and Head of Department of Gastroenterology and Endoscopy at the Scripps Memorial Hospital, Encinitas, California.

Dr. Kimball and his wife Trish, an elementary school teacher in Waikoloa, have lived on the Big Island since 2001. They have made their permanent residence in beautiful Puako where they take pleasure in the wonderful views, breezes, and laid back lifestyle of the island. Dr. Kimball’s hobbies include tennis, bridge, gardening, and walking on the beach.

Doctor Kimball's Certification


64-5188 Kinohou Street Kamuela, HI 96743 | (808) 887-0600