The IRS says:
Ask your employer to correct the error. If your employer doesn't correct it by the end of February, you should either:
We'll send your employer a letter asking them to give you a corrected W-2 within 10 days.
We'll also send you instructions for Form 4852, Substitute for Form W-2. You can use it to estimate your earnings.
The nice thing about this is that you can point out to your employer that it puts them on the IRS's radar, presumably something they would want to avoid.
Of course, this will be a slow process (I would try the Taxpayer Assistance Center first if there is one near you). You are likely to need to file an extension. You can do that through TurboTax (form 4868), or you can file a federal extension by going to Extension. Note that you can use IRS File File to file an extension online.
There is an alternative, which would be to reduce your personal (direct) HSA contribution (based on your numbers, I assume that you made one) by $200, so that the excess would go away. But this means that you will have to document this and live in concern that someday this may come out, and then you'll have to explain.
A worse choice would be to change the code W amount to the correct amount as you enter it, because this won't match the W-2 that the IRS got; thus may cause the IRS to write you a letter asking you "what gives?" - most people want to avoid that.
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