About Me

Dr. Chaurasia received his medical degree from Patna Medical College, formerly the Prince of Wales Medical College, Patna, India, followed by internal medicine training in England, UK.

He completed his residency training in internal medicine at the University Medical Center, East Carolina University, Greenville, North Carolina. In addition, he served there as the chief medical resident.

He obtained 3-year fellowship training in gastroenterology and hepatology at the University of California, Irvine. At the University of Amsterdam, Holland, an internationally renowned center for pancreatobiliary endoscopy, he completed advanced training in therapeutic ERCP.

His board certification includes American subspecialty board of gastroenterology which he passed with the highest decile of ten. He has received several awards including the Glaxo Fellow’s award at the national meeting of the American Gastroenterological Association.

He has served as the President of the Orange county gastroenterology society, and as a committee member of the American College of Gastroenterology. He has served on the clinical faculty as Assistant Clinical Professor at the University of California, Irvine, and is currently the medical director of Pacific Gastroenterology Endoscopy Center.

In addition to general gastroenterololgy including colon cancer screening, he has a particular interest and expertise in the Endoscopic Retrogrde Cholangio-Pancretography (ERCP) and in the field of pancreatobiliary diseases.

In peer-reviewed journals, he has authored several original articles and abstracts. He has given presentations at various professional society meetings at the state, national and international levels.


  • Colon cancer screening
  • Gastroesophageal reflux disease
  • Pancreatic and biliary diseases


  • Shankar U, Prasad M, Chaurasia OP. A rare case of langerhans cell histiocytosis of the gastrointestinal tract. World J Gastro¬enterol 2012; 18(12): 1410-1413.
  • Chaurasia OP, Rauws EAJ, Fockens P, Huibregtse K. Endoscopic techniques for retrieval of proximally migrated biliary stents: the Amsterdam experience. Gastrointest Endosc 50:780-785, 1999.
  • Chaurasia OP. Percutaneous Endoscopic Gastro-jejunostomy tube placement. Gastrointest Endosc 47:433-434, 1998.
  • Irwin FL Jr, Sarfeh IJ, Tanoue K, Chaurasia OP, Tarnawski A. The role of extracellular matrix in injury to gastric mucosa by indomethacin. J Clin Gastroenterol 21 Suppl 1:S18-23, 1995.
  • Chaurasia OP, Chang KJ. A novel technique for percutaneous endoscopic gastrojejunostomy tube placement. Gastrointest Endosc 42:165-168, 1995.
  • Chaurasia OP, Marcuard SP, Seidel ER. Insulin-like growth factor I in human gastrointestinal exocrine secretions. Regulatory Peptides 50:113-119, 1994.

English, Hindi

Provider Specialty

Gastroenterology, Internal Medicine


  • Gastroenterology



UC Irvine Medical Center


East Carolina University


Patna University - Dental College & University