Indicate Default Rendering Provider in Client Profile
I need to be able to indicate which staff member is assigned as the rendering provider for each client.

You can now set a default rendering provider on the client’s Bill to & Insurance info tab, ensuring that you will always bill with that specific provider for their payer. Check out our help article for more information: https://help.theranest.com/en/articles/2305520-submit-claims-with-a-supervisor
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Kris Dohse commented
For "incident to" billing it would be ideal to have a permanent designated "rendering" provider that doesn't have to match the "assigned staff" provider on the invoice. This way the organization can still bill insurance and not have to manually adjust the rendering provider for all "incident to" invoices.