Northcrest Family Medicine Dr. Richard Jackson Canton, 770.720.2113. Asthma and Allergy. Dr. Erinn Gardner Canton, 770.720.8000. Dr. Lily G. Hwang Riverdale, 770.996.1524. ... Patient Portal. Login now! Please Note: To sign up for the new patient portal, you must call the office for an invitation. Pay Your Bill Online..