Eva E Sum MD Top Doctor 915 Old Fern Hill Rd West Chester, Pennsylvania, 19380 Phone: 610-664-9700 Company Name: US Digestive Health Doctor Category: Gastroenterology and Internal Medicine Profile Let this business know you found them on Main Line Today's Online Directories. Locations West Chester 915 Old Fern Hill Rd West Chester, Pennsylvania 19380 Claim/Edit Listing