After receiving an email requesting a payment of $250. and paying it with a credit card,  I was informed when I checked in that the payment wasn't necessary until the charges were submitted to my insurance providers.  I was also told that it may take up to 3 to 4 months to receive a refund. I think this is ridiculous to be asked for payment before the CT scan and then be told that it would take several months to get a refund.  
PH-CT