Question about unknown medical bills now in collection on my credit report

http://repairbadcreditreports.blogspot.com/2007/07/medical-bill-collection-unknown-inquiry.html

I was doing some research on the internet and i came across this post from last year. I had a question about unknown medical bills and I dont know where to get any other information from. Basically about 5-7 years ago I went to the ER, I am pertty sure I was still in High School for the first case, because I remember being out school...anyway my question is can the hospital send a bill to collections agency with out me ever reciving a bill and not knowing I owed anyone anymoney and its been over 5 years. what do i do?
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many times this is the only way for hospitals to collect. Many people move and they cannot send a proper bill to the proper place so they put it on the credit report. When ever that person wants credit the hospital gets paid. as far as age goes. you may have been younger than 18 and might get out of the bill on that accord. I would dispute the bills. Say they ae not yours and ask for validation the bills.