You would not code the 73510 with an RT and LT as it is a unilateral only, you would not use this if 2 views of each hip are taken. 73520 is a minimum of 2 views, so it will cover even if 2 views of each hip are taken
Here is what the AMA says
AMA Comment
According to the American College of Radiology, an anteroposterior (AP) view of the pelvis, as well as additional views of both hips, is the appropriate method of examination when a bilateral hip study is ordered. In addition to the AP view of the pelvis, at least one more view of each hip, typically a coned-down frog leg lateral view, is obtained amounting to three views: one AP view of the pelvis which includes both hips; one frog-leg lateral of the right hip; and one frog-leg lateral of the left hip.
However, if a bilateral study is performed without an AP view of the pelvis, then code 73520, Radiologic examination, hips, bilateral, minimum of two views of each hip, including anteroposterior view of pelvis, may be reported with modifier -52, Reduced services, appended to indicate that the study was not performed in its entirety. CPT code 73510, Radiologic examination, hip, unilateral; complete, minimum of two views, is not intended to describe a bilateral hip study, but a complete radiological examination with a minimum of two views performed on a single hip.