If you plan to get reimbursed in 2019, don't report them as deductible expenses on your 2018 return.
If you do report them as a deduction, then the reimbursement may become taxable income (a reimbursement of a previous deduction.) It's better to avoid that whole mess and not deduct the expenses now if you know you will get a tax-free reimbursement from an HSA or an insurance company.
