Patient Portal. Flower Mound Office 5000 Long Prairie Rd Flower Mound, TX 75028. Northlake / Argyle Office 1234 FM 407, #100 Argyle, TX 76226. Phone: (972) 420-1776. Physical Office: 8:00 AM - 5:00 PM MRI: 7:00 - 5:00 PM Physical Therapy Center(Mon-Thur): 7:00 AM - 7:00 PM.