Here are the mistakes federal inspectors are ready to pounce on. Coding, double-billing, cost reporting, documentation, non-covered services -- when it comes to claims prep, you've got all the basics covered. But despite all of your hard work, the HHS Office of Inspector General says, other liability risks can still leave you vulnerable. New draft compliance program guidance from the OIG raises the red flag on "underappreciated" threats that have emerged in hospital compliance -- threats you'll want to make sure you address. They include: To read the draft guidelines, go to http://a257.g.akamaitech.net/7/257/2422/06jun20041800/edocket.access.gpo.gov/2004/pdf/0412829.pdf.