Medical One Clinic Address 29 NW 1st Lane Lamar, MO 64759 location Get Directions Phone: 417-681-5266 Hours 7 a.m.-7 p.m., Monday through FridayHoliday hours may vary. About The Medical One Clinic at Cox Barton County Hospital has a team of health care professionals to care for you and your entire family. Our services include management of chronic health conditions, women's health care, diabetic care, orthopedic services, preventive care, occupational medicine and more.