unknown collections on my credit report

I have a notice on my credit report that I have an account with Medicredit that is in collections. I would like information on what it is for. I have not received any mail or phone notifications and have no idea what it is for. The amount is for $374.00 and it was opened on 12/1/2010. Please get back to me asap and let me know if it actually my debt or an error on your part that needs to be disputed. Thank you.