Medical billing hip MRI rules are not as straightforward as you might assume. There are many variations on how to correcting bill for this service. There are some facts you should keep in mind when doing medical billing for lower extremity MRIs. Unfortunately, there is no specific medical billing CPT code for an MRI of the hip. You need to use the codes 73721-73723 (Magnetic resonance imaging, any joint of lower extremity). The hip joint falls into this medical billing category because it is a lower extremity joint. Doing medical billing for bilateral hip MRIs is also a bit more complicated. Different payers require different modifiers for payment. For example, …