You should enter your CSA 1099-R exactly as shown on the form. The IRS has a copy of it.
If there is no amount in Box 5, that means that no part of your pension was used to pay Health Insurance.
Any amount in Box 5 is transferred to Schedule A, Itemized Deductions, for Medical Expenses.
If you paid your own Medical Insurance Premiums, you can enter this amount yourself in the Deductions & Credits section.
Here's more info:
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