Pay Your Bill Pay Your Bill Upstate Carolina Radiology is a part of US Radiology Specialists. You will be redirected to their secure online billing portal. Please view your statement as it will have the correct practice on it so that you can make an online payment. To pay online for a date of service on or after 10/1/2020, click here. To pay for a date of service prior to 10/1/2020, call 800-841-4236 or visit the MSNllc.com patient portal.