Patient Portal Login. Contact // For billing q uestions // AshburnWalkInClinic@Yahoo.com. 703.687.4363 Office Locations & Hours. Ashburn Walk-In Clinic & Primary Care. 21001 Sycolin Road. Unit #180. Ashburn, VA 20147. Office Hours: Monday - Friday: 8:00am - 6:30pm Saturday: 10:00am - 4:00 pm Sunday: CLOSED.