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I lost my ITIN, how do I get that number again?
Hi and welcome to JustAnswer!
You should not apply for new ITIN number. You may use the same number for filing taxes. If you filed your tax return - check copies - they should have ITIN.
For questions regarding lost or misplaced ITIN information - call the IRS _800_829_1040_ or _866_562-5227_ (Hours of operation are 7 a.m. to 10 p.m., Monday-Friday, your local time - except Alaska and Hawaii which are Pacific time.)
See more information about ITIN 's here - Publication 1915, Understanding Your IRS Individual Taxpayer Identification Number - http://www.irs.gov/pub/irs-pdf/p1915.pdf