Dr. Koller is at KU Med Ctr in Kansas City, KS. I don't have the address with me but the phone no. is (913) 588-6970. As I recall, the office staff is in from about 9 am to 4:30 pm central time. My mother sees Dr. Pahwa at KU, and we are very happy with him and the nurses. Mary [log in to unmask]