Is there documentation to support when it is appropriate to bill D0470, Diagnostic Casts? I have a provider that seems to think that he can bill this code when taking impressions and bite registration for a sleep apnea appliance. I would like to have something in writing to support the explanation of this code. Thank you.

According to the ADA D0470 diagnostic casts are billable anytime diagnostic aides are needed or required for the treatment of specific procedures (i.e. orthodontia, TMJ disorders, Orthognathic Surgery, etc.). This code would be inappropriate for impressions and bite registration if diagnostic casts are not created. Impressions and bite registration would be considered an inclusive part of the appliance and therefore not billable as a separate procedure.