Unscheduled urgent or emergency care is becoming more common.  It is considered unscheduled because it is between the office visits your doctor has scheduled.

In an important report by doctors K. Kocher and B. Asplin (Annals of Internal Medicine volume 158, page 908, 2013), 30% of outpatient visits in the United States are for unscheduled care which occurs either urgent care centers, emergency rooms, at emergency visits with your own  physician, or an emergency visit…

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