If you have been a victim of identity theft and have reported this info to the IRS , you should be receiving a letter from them – 4869CS. Please keep this letter safe and take it to your preparer when you get your tax return prepared. It will help speed up the processing of your return.
http://liarcatchers.com/identity_theft_investigation.html
If you have not notified the IRS about your identity theft, please check out this post explaining what forms you will need to fill out.
FYI – the Identity Protection Specialized Unit has changed their FAX number to 978-684-4542.