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For all your digestive health concerns, trust Advanced Gastroenterology.

Dr. Samuel K. Sim and Dr. Frank Yeh have extensive experience treating all types of digestive disorders. In addition to performing colonoscopy and upper endoscopy, our gastroenterologists provide:

  • Advanced evaluation of persistent heartburn and gastroesophageal reflux disease (GERD). Our doctors offer tests called esophageal manometry and esophageal pH testing to accurately diagnose your condition.
  • Minimally invasive radiofrequency ablation for treatment of Barrett’s esophagus, a precancerous condition of the esophagus.
  • Diagnosis and treatment for irritable bowel syndrome, Crohn’s disease, ulcerative colitis, diarrhea, constipation and other digestive problems.
  • Evaluation of the bile ducts with a technique called endoscopic retrograde cholangiopancreatography, or ERCP.


The specialized care you & your doctor can trust for:

  • Colon cancer screening & prevention
  • Persistent heartburn & GERD
  • Irritable bowel syndrome
  • Crohn’s disease & ulcerative colitis
  • Constipation
  • Diarrhea
  • Abdominal pain
  • Ulcers
  • Liver problems
  • Pancreatitis
  • Difficulty swallowing

For further information please visit our Medical Library.

If you need to make an appointment please call 360-576-5060, or use the online Appointment Request form.