I think we would need more information and to actually see documentation and what happened to help you. There could be a lot more going on here or there may not be anything. In some cases, it matters if you "split bill" meaning bill separate pieces of the encounter split onto different claims. In other cases, it does not matter at all. There is no NCCI edit between 72148 (MRI spinal canal and contents lumbar w/o contrast) and 72110 (4 view spine XR lumbosacral) for example. So, splitting wouldn't matter when it comes to that. What could possibly matter is the MPPR (Multiple Procedure Payment Reduction) for Radiology. It's for the work involved with prep, draping, supplies, etc. done at the same session.
I would also ask why the MRI and X-Ray are being done on the same date, especially if this is an in-office orthopedic service, unless they find something concerning or urgent on XR and need the MRI stat. Or, have to take the patient to surgery urgently.
MRI normally require pre-auth (unless MCR or MCR Advantage), and as suggested above, the X-Rays would normally be done prior to that and not on the same day. It "could" happen but I would ask why.
Is this a non-op spine (physiatry) or spine surgeon office? Is the office billing for the global component, do they own the equipment, is the provider only billing the professional component? (TC/26 modifiers) Does the patient have multiple body areas requiring imaging and they did an XR on one anatomic area and MRI on a totally separate area?
There also could be reasons related to the accession number and the imaging system/EHR used when linking to the claim in the practice management system.
Did you ask the Medical Director, manager, or a supervisor the reason?
Now, if they are trying to get around a MPPR by doing this and the codes would have this policy applied, yet they are billing and being paid 100% for both where they should have gotten 50% for the lower RVU one, that's a problem. You would have to look up the codes, be billing the TC for both, and they would have to be codes that meet the rules for it.
MPPR Example from UHC:
https://www.uhcprovider.com/content...ement/COMM-MPPR-Diagnostic-Imaging-Policy.pdf
"Under the CMS guidelines, when multiple diagnostic imaging procedures are performed in a single session, most of the clinical labor activities and most supplies, with the exception of film, are not performed or furnished twice. Therefore, CMS applies a reduction in reimbursement for secondary and subsequent procedures because payment at 100% for secondary and subsequent procedures would result in duplicative reimbursement for clinical labor activities only performed once. Examples of clinical labor activities, not furnished twice, include but are not limited to: Greeting the patient Positioning and escorting the patient Providing education and obtaining consent Retrieving prior exams Setting up the IV Preparing and cleaning the room"
p.s. - Do not reference PI or PS modifiers. This has nothing to do with your question.