Well...in a way.
The per-diem $$ you received will probably be included in your W-2 $$.
You just enter your W-2 data and it's taken care of.
Yeah, any per-diem paid to a W-2 employee ends up being considered as added taxable income.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*