Q: Is it possible to add additional providers to cc in the cc box beyond the options (e.g. current provider, referring provider 1, 2, 3, patient etc...) that are currently available?

From Galen Healthcare Solutions - Allscripts Enterprise EHR Wiki

Yes. This can be done in the Patient Profile Dialogue form under Associated Providers. When set up, the providers are defaulted as cc providers per patient.
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