Partners In OB/GYN. Nursing (Nurse Practitioner), Obstetrics & Gynecology • 3 Providers. 3421 W 9th St Ste G4500, Waterloo IA, 50702. Make an Appointment. (319) 233-8865. Partners In OB/GYN is a medical group practice located in Waterloo, IA that specializes in Nursing (Nurse Practitioner) and Obstetrics & Gynecology..