That 1099-MISC you received is grossly late.
If you filed electronically and the IRS already accepted your return, you are home free. As long as the income you report equals or exceeds what has already been reported to the IRS it is unlikely that the IRS will question it.
I disagree with Colleen, if you were to paper file you could include a schedule or a statement listing all of your 1099-MISCs. but I would suggest that you wait until you hear from the IRS, if at all. Make any response short and to the point providing documentation and include a copy of the letter they send you.
