Need Help with billing diagnostic cast for Maxillofacial surgery


I bill for the oral medicine and dentistry dept in a Hospital and we are having patients sent to us by maxillofacial surgery for diagnostic casts and pan's before surgery. We can not bill the dental insurance for these procedures (and most of them don't have dental insurance anyway.)
Pan's are only covered by dental insurance every 5 years and diagnostic cast are only covered for Orthodontics.

So how would I bill the medical, what medical code would I use?
Or are these part of the maxillofacial global billing?