First, remember you can only reimburse yourself for expenses that you incurred after opening the HSA. For example, if you opened the HSA in June 2021, you can't reimburse yourself later for expenses you incurred before that date.
Second, remember that if you list your 2022 expenses as itemized deductions, and you later use your HSA to reimburse yourself, you may have to pay income tax on the reimbursement as a taxable recovery--a reimbursement of a previous deduction.
Then, if you are still planning to count your 2022 HSA withdrawal toward your 2021 expenses, you must enter your 2021 expenses in Turbotax. This is because of how Turbotax handles medical expenses--it expects you to enter all your expenses regardless of how they were paid for, and then it wants to subtract all your reimbursements. Since you loaded the 1099-SSA for withdrawals, you need to enter the corresponding expenses so the math balances, even if those expenses happened in a previous year. The IRS doesn't get details of the expenses, only the final number of the deduction, which (after the HSA and the past expenses cancel each other out) would be the unreimbursed expenses you incurred in 2022.
