Can pt treat 8 mm round ossification medial to the glenohumeral joint-suggesting osteochondral body in the superior subscapular recess?

PT's work with symptoms not structures. Your post does not explain what symptoms you have that lead to the imaging study that found the ossification. You are welcome to start over & describe whatever problem you have but add the finding in your post. Posts here are not linked, so each should contain all relevant info & question.

I, this is a small area of calcified, bony type formation or even a chipped off piece of a bone. Physical therapy does not treat this bony abnormality. However, if this is symptomatic, physical therapy can help strengthen the shoulder joint in general and decrease symptoms.