No. Starting in 2018 W-2 job related expenses are no longer deductible. So if the per diem was included in box 1 of your W-2, it's taxable income to you.
You may wish to talk with your employer about an "accountable" reimbursement plan. This is a plan where you provide the employer receipts for your qualified W-2 job related expenses and they reimburse you. Then the amount reimbursed is not included on your W-2 and you therefore don't get taxed on it.
