Southwest Medical, part of Optum, is a multi-specialty group of Physicians, Nurse Practitioners, and Physician Assistants at clinical locations including health care centers, urgent care clinics, convenient care centers and an outpatient surgery center. Warm weather, 300-plus days of sunshine, championship golf, hiking, skiing, five-star restaurants, endless attractions and entertainment choices are reasons Las Vegas is one of the fastest-growing cities in the United States.