Hi Guest!
Great question - it will depend on the field of view for the xray. Here are the full descriptions of those two codes:
70150 - Radiologic examination, facial bones; complete, minimum of 3 views
70486 - Computed tomography, maxillofacial area; without contrast material
United Healthcare states to use 70486 for CBCT in their radiology medical policy, here is a link to that policy (see page 89):
https://www.uhcprovider.com/content/dam/provider/docs/public/policies/clinical-guidelines/cardiology-radiology-imaging-guidelines.pdfHope this helps!