Is the ART provider a chiropractor?
If so, he/she should be able to do a thorough exam and atleast come up with a differential diagnosis.
The most obvious things to rule out would be rotator cuff injury, bursitis, labral tear or long head of the bicep injury.
If the provider is a doc, if the shoulder does not respond to treatment, then have them refer you for an MRI w/ contrast. If anything shows up on the test that would warrant an ortho consult, then the appropriate referral should be made at that point.
Keep me posted,