Please clarify your question.
Code D in Box 12 on the W-2 is:
D — Elective deferral under a 401(k) cash or arrangement plan. This includes a SIMPLE 401(k) arrangement.
If that is the case, Box 1 (Wages) of the W-2 will be less than Box 5 (Medicare Wages) by that amount because Box 1 took advantage of the 401-K deduction.
There is not a number designation like (20) associated with Box 12. If This is not a 401-k contribution. I suggest you contact your employer for clarification.
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