If I understand the question...
First, you report the entire $10,000 as a distribution in 2019, no matter what years the $10,000 came from.Once the contributions are in the HSA, it's just a big pot of money with no clocks.
Second, it is counter-intuitive, but you may probably need to enter the HSA distribution into the Medical Expenses interview for Schedule A.
Ordinarily you would not try to deduct HSA distributions on Schedule A as an Itemized Deduction. However, TurboTax automatically subtracts the amount of HSA distributions from what you report on Schedule A Medical Expenses, so you need to put in a placeholder for HSA covered expenses on Schedule A.
In the miscellaneous medical expense page in the Schedule A interview, add a line that says "HSA covered expenses" and $10,000.
The reason for this is because TurboTax assumes that you have entered ALL medical expenses, included those covered by insurance and HSAs. That is why you are asked about insurance reimbursements. The problem is that you don;t see TurboTax doing the same thing with HSA reimbursements, so you don't think of it.
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