Patient Portal Pay Your Bill. 319-235-5390 1-800-211-9244. 4150 Kimball Ave. P.O. Box 2758 Waterloo, IA 50704. Home; ... We're here for you. Contact Us. Home / Portal Healow. Cedar Valley Medical Specialists is proud to bring our patients the latest in health care management. You can take charge of your own health by having secure access to ....