please clarify. are you making the HSA contributions personally or is your employer making them by either making its own contributions for you or deducting them from your paycheck? if it's your employer either making the contributions and/or deduction from your paycheck the amount must be reported on your W-2 code W in box 20. which carries to line 9 of form 8889. if through your employer do not duplicate by entering them as your contributions
you may have money in multiple accounts but for tax purposes, they are considered 1 account and you file only 1 8889 reporting totals.
you should have received form 5498-SA reporting contributions from each trustee.
