"D" in box 12 = your 401(k) (or whatever qualified plan federal employees have).
"DD" in box 12 = the amount that your employer (and you) paid towards premiums for health insurance.
Both of these amounts are removed from Box 1 on the W-2.
In your case, you don't appear to have any employer contributions or contributions by means of payroll deduction to your HSA. So in fact, you should not have had a code W in box 12. Your situation is not customary, hence the reason why I reacted the way I did.
Your HSA contributions as "pass-through" were all in that code DD amount, so they WERE removed from Wages in box 1. That is, they were excluded.
You don't need to deduct these contributions on your tax return, because they were excluded already.
You can verify this by asking your HR people to confirm that the pass-through contributions came from your health insurance premiums and therefore were part of the code DD amount.
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