Yes, MedStar Urgent Care requires you to book an appointment for Georgetown University Hospital to ensure you get a quick service at the MedStar Urgent Care appointment scheduled time, without the need to wait in line. If you cannot get to your appointment at the scheduled time and date, you are advised to access the MedStar Urgent Care online scheduling system or call MedStar Urgent Care office at (202) 877-7000 to cancel or reschedule.