San Francisco, CA, May 20, 2002 --- MDdatacor, inc., an Atlanta-based medical informatics company, today announced the gastroenterology market introduction of MDinsight™, its physician practice-based informatics solution. DIANON Systems (NASDAQ:DIAN), a national provider of cancer and genomic diagnostic services, has exclusive distribution rights for MDinsight in the gastroenterology specialty. Dianon is introducing the product at this week's Digestive Disease Week meeting (Booth # 1047).

MDinsight utilizes a patented process that converts previously non-searchable medical information in the physician practice into a clinical database that can be mined using its proprietary search technology. Results of these searches are presented back to the practice via secure Internet connection and provide them with decision support tools that improve clinical outcomes and enhance the practice's clinical research capabilities.

Martin Stefanelli, senior vice president, Sales, Marketing and Business Development for DIANON Systems, commented, "We believe MDinsight will enhance DIANON's pathology services by integrating our diagnostic results with other clinically relevant patient information, enabling the physician to more effectively assess the clinical utility of various treatment modalities and their impact on patient outcomes."

As a remotely delivered service, MDinsight does not require the practice to purchase, install or maintain expensive software, nor will it change the practice's normal workflow. Practices need only Internet access and electronic copies of patient medical information to be able to fully benefit from this service.

David Finkelman, MD, chief executive officer of Digestive Care Associates, an Atlanta-based gastroenterology practice commented, "As one of the first practices to use MDinsight, we have already seen how this exciting technology improves our ability to recruit patients into clinical trials."