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Center for Gastroenterology & Metabolic Diseases
Seneca Hill Health Services Center
105 Co. Rt 45A
Suite 400
Oswego, NY
Phone: 315.312.0089
Map and driving directions

Our specialists at the Center for Gastroenterology & Metabolic Diseases offer the highest quality of care for a wide spectrum of diseases and disorders affecting the gastrointestinal (GI) tract, which includes the esophagus, stomach, liver, gallbladder, bile ducts, pancreas, intestines, colon and rectum.

Common conditions treated:

  • Cancers of the digestive system
  • Gastroesophageal reflux disease (GERD) (Barrett's esophagus)
  • Heartburn/reflux
  • Swallowing and esophageal disorders (achalasia)
  • Abdominal pain
  • Gallstones
  • Biliary stones, stricture and leaks
  • Pancreatitis
  • Peptic ulcer disease
  • Inflammatory bowel disease (IBD)
  • Celiac disease
  • Diverticular disease
  • Tumors and growths of the digestive system
  • Intestinal obstruction
  • Cirrhosis of the liver
  • Hepatitis (A, B, C, D and E)
  • Screening for colon cancer
  • NASH—nonalcoholic steatohepatitis
  • Anorectal disease (hemorrhoids, anal fissure, anorectal abscess and fistula)


Ajoy Roy, MD

Dr. Ajoy Roy has been practicing gastroenterology care for the more than 30 years in Oswego County. He earned his medical degree from Patna Medical University in India. He completed his fellowship at Yall University Medical School and is board-certified.

Suri Karthikeyan, MD

Dr. Suri Karthikeyan has nearly 30 years of experience treating a variety of gastroenterology diseases in addition to performing advanced endoscopy procedures.

Earning his medical degree at Madras Medical College, located in Chennai, India, Dr. Karthikeyan has quite an extensive clinical background including Resident in Internal Medicine at various NHS hospitals in the UK and obtained specialist certification in Internal Medicine, MRCP(UK) by the Royal College of Physicians of the United Kingdom, followed by Residency in Gastroenterology in Leicester.

Subsequently he pursued an Internal Medicine Residency and Gastroenterology Fellowship at McMaster University in Ontario, Canada, and obtained specialist certifications in Internal Medicine and Gastroenterology, FRCP(C) by the Royal College of Physicians and Surgeons of Canada followed by board certifications in Internal Medicine and Gastroenterology by the American board of Internal Medicine.

For the past 26 years, he has been in private practice in both New London, Connecticut, and Rochester, NY from 2001-2020. In addition to clinical work, Dr. Karthikeyan has been very involved in teaching medical students and medical residents at the University of Rochester and Unity Hospital of Rochester. Dr. Karthikeyan is board certified in Gastroenterology and is a member of American College of Gastroenterology.

Deanna Grimshaw, RN, BSN, MSN, FNP-C

Deanna Grimshaw recently joined Dr. Ajoy Roy and Dr. Vikram Jala at the Center for Gastroenterology & Metabolic Diseases.

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