Meet Our Team

In our private Vancouver practice, Dr. Sim and Dr. Yeh work with our highly skilled medical staff including a nursing team with over 60 years of combined experience. Advanced Gastroenterology provides testing and treatments for all kinds of digestive health issues, from routine to complex, always with personal attention and service for you and your doctor.

Samuel K. Sim, MD


Board-Certified: American Board of Gastroenterology
Fellowship: Gastroenterology: University of Colorado Health Sciences Center
MD: University of Alberta

Protecting your health and quality of life.

I always knew I wanted to be of service to others, so medicine was the perfect choice for me. I was drawn to gastroenterology because it is intellectually stimulating and allows me to play an important role in protecting my patients' health. I also appreciate the technical aspects of this specialty. I have performed thousands of gastroenterology procedures over the years and enjoy my work now more than ever.

You may need to see me for a chronic digestive problem that interferes with your day-to-day life. You may need a procedure to screen for colon cancer or to test for an upper digestive problem. Whatever brings you to our office, I am here to make a positive difference in your health and quality of life… the reason I became a physician in the first place.

The latest in gastroenterology, with personal care and compassion.

In our private practice, we offer the latest technology and stay up-to-date in our specialty. We also provide a level of personal care and compassion that I believe you’ll appreciate. Our entire team cares about you, and it shows. As my patient, I will take time to talk with you about your situation and answer all your questions. I want you to be informed about your health and comfortable with me and with the care you receive at Advanced Gastroenterology.


Frank Yeh, MD


Board-Certified: American Board of Gastroenterology
Fellowship: Gastroenterology: Fletcher Allen Health Care/UVM
MD: University of the Health Sciences

Knowledgeable, detailed care individualized for your gastrointestinal health care needs.

My name is Dr. Frank Yeh and I am very happy to be joining Dr Sim at Advanced Gastroenterology! If you are coming to see me, you can be sure I have thoroughly reviewed your medical history. I have wanted to be a physician since the age of five when I had my first surgery. The detective work of clinic combined with the exploration of procedure is the biggest reason I got into the GI field. A colonoscopy is one of the very few cancer tests that can actually find an abnormal growth before it ever really becomes a cancer. Most other cancer screening tests can only detect established cancer, not pre-cancer.

To give you a sense of my background and hopefully make you feel a little more comfortable, let me tell you a little bit about myself. From kindergarten through high school, I lived in Southern California. I moved to Northern California to attend college at UC Berkley. After that, I started the gradual move eastward to North Chicago, IL where I received my medical degree from Chicago Medical School. I then completed my residency in internal medicine and a fellowship in liver transplant from Lahey Clinic Medical Center in Burlington, MA. Finally, I moved to one of the most northeastern states, Vermont, where I completed a fellowship in gastroenterology at the University of Vermont in Burlington, VT.

After completing 11 years of medical school, residency, and advanced training, I practiced in the Central Valley of California, where almost the entire almond supply of the world comes from. Now I’ve moved to the most northwestern state in the country, beautiful Washington.

My medical interests include transplants and endoscopies. Away from work, I enjoy travel, skiing, and watching movies. My wife and I were just blessed with a new baby, so most of my free time is spent with my family.