Home > Find A Doctor Find A Doctor Search for a physician or surgeon with privileges at Passavant Area Hospital below. For healthcare providers: Online Provider Verification Gary Chen, MD, Ph.D. Internal Medicine / Nephrology Central Illinois Kidney and Dialysis Associates 3401 Conifer DriveSpringfield, IL 62711 Phone Number: 217-726-2527 Fax: 217-726-7787 Back to Care Providers