Statements to Insurance Companies

We are still having trouble invoicing insurance companies.
Our clients are all singly invoiced as we do not want them to go in to the collective invoicing like BUPA.
When we want to send a statement of the client’s outstanding invoices to the insurance company, the statement is incorrect in that it gives us the client’s name and not the insurance company. When invoicing the insurance company the dates of treatment are not included.
How can we resolve this problem?