Not sure what the 20 next to Code D in Box 12 of your W-2 would be. Code D indicates contributions to a Retirement Plan, so be sure to enter the amount in TurboTax. Just choose 'D' from the dropdown menu.
It could be an employer designation for the type of Retirement Plan, if your employer offers more than one type of plan. You could verify this with your employer.
Click this link for more info on How to Manually Enter a W-2.
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