As you noted, TurboTax automatically subtracts the amount of HSA distributions used for qualified medical expenses from the medical expenses that you enter when you are itemizing medical expenses on Schedule A. When under Deductions & Credits TurboTax asks you to enter your medical expenses, you must include those for which you obtained an HSA distribution even though they were incurred and paid out of pocket in an earlier year. However, you said that you will be using the standard deduction on your 2023 tax return, so there is no need to enter medical expenses at all.
Just be aware that, with respect to an HSA, qualified medical expenses are only those incurred after the establishment of the HSA. You are not permitted to reimburse yourself from the HSA for medical expenses incurred before you establish the HSA.
