I am completing my 2019 tax returns I am trying to input my Social Security 1099 in the description of box 3 there is a description titled

[marysel-]

I input my Medicare Part B premiums deducted from my benefits. But there is another amount that was withheld titled Deductions for work or other adjustments.  In what box do I report that information.

[ColeenD3]

You don't have to enter the SSA-1099 Box 4 amount because it is already accounted for in Box 5, Net Benefits. 

Specifically, Box 5 = Box 3 - Box 4, or Net Benefits = Benefits minus Benefits Repaid. 

Please see this LINK for more information.