On your W-2, Box 12 with code W indicates "Employer contributions to Health Savings Account."
Even though it says "employer" contributions, it is the sum of the amounts that your employer contributed to your HSA AND that you contributed through a payroll deduction plan. There is no breakdown of what you contributed and what your employer contributed.
For more information on the codes listed in Box 12 of your W-2, please see the following FAQ: What do the letter codes in Box 12 of my W-2 mean?
[Edited | 3/10/2020 | 10:22am PDT]
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