Hi everyone, back in febuary of 2010 I had a lumbar puncture done at Anaheim Memorial in California, and now on July 20th I recieved a phone call from the hospital demanding a $500 phone payment or it will go to collections. I have not recieved a bill from the hospital for this procedure in the past 6 months, and now, they are demanding payment. I have never encountered this problem, but is this considered "ok", or has the hospital violated a fair billing law? When I initially paid my co-pay on the day of the procedure I did notice that it had increased from $25 to $50. I was told that my insurance coverage had changed, and that was the reason for the higher co-pay. If I have to pay the $500 then theres nothing i can do, but I dont appreciate never recieving a bill. What are the rules of billing, can they not send me a bill and then demand that I pay over the phone? Or do I sense that the billing department has fouled up and someones trying to not fess up to their mistake. Thanks to all who respond.