Question Radiology coding questionn

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I am a radiology biller and was wondering if there is a Z code that could be used when the radiology exam is necessary because of another test that is being done the same day. For example, a chest x-ray before a nuclear medicine lung test. An orbital x-ray before a MRI to screen for foreign bodies. A long leg x-ray before or after the MRI to obtain measurements for the prosthesis.