Have you tried going to your HSA custodian's website to see if you can download the 1099-SA? You really need to get the form - besides, the HSA custodian is required to give it to you.
As for making a mistake last year, it's possible but not likely. First your medical expenses that are not reimbursed by insurance or covered by your HSA have to exceed 7.5% of your adjusted gross income to even be entered on to Schedule A.
And, as you know, the amount of Itemized Deductions have to exceed your Standard Deductions to use the Itemized amount.
Since the Standard Deduction doubled starting in tax year 2018, the number of taxpayers about the used Itemized Deductions has dropped to less than 10%.
So, yes, if you entered your medical expenses but didn't include the HSA expenses, the amount of medical and dental expenses would be understated. But for most taxpayers, it wouldn't matter. You would have to redo your return with a single entry under Miscellaneous medical expenses for the amount of the HSA distributions (the 1099-SA) so that your medical and dental expenses are not artificially lowered, to see if it makes any difference on your return.
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