Answer:
See below
Explanation:
The explanation could go as follows
"Hello, sir/madam. We apologize for the inconvenience this may have caused, but there has been a slight change in our insurance policy that you need to be updated with. We require our patients to acquire a second opinion from a doctor of your choosing that supports the first one. Only then will we be able to process your pre-authorization. Thank you for your understanding and cooperation."