Dr. John Costable graduated with a Bachelors of Science degree from the University of Rochester.


He graduated from SUNY Stony Brook School of Medicine and completed his internship and residency in Internal Medicine at the University of Massachusetts Medical Center.  


In 1988 he completed his Fellowship in Gastroenterology and Liver Disease at North Shore University Hospital and NYU Medical Center.


Dr Costable is Board Certified in both Internal Medicine and the specialty of Gastroenterology and Liver Disease.


Dr. Costable has been in private practice on the North Shore of Long Island for over fifteen years 


He is well trained in all areas of Gastroenterology and his areas of special interest include:

Colon cancer/ screening



Liver Disease

Pancreatic Disease

Inflammatory Bowel Disease

Small Bowel /Capsule Endoscopy

Dr. John Costable