TurboTax is calculating your Form 8959 line 9 correctly. According to the instructions for Form 8959, line 19 at this link:
Line 19
Enter the amount of Medicare tax withheld, if any, reported on Form W-2, box 6. If you have more than one Form W-2, add the amounts in box 6 of all your Forms W-2 and enter the total here. If you are filing a joint return, include your spouse’s Medicare tax withheld.
Also include any uncollected Medicare tax on tips from Form W-2, box 12, code B, and any uncollected Medicare tax on the taxable cost of group-term life insurance over $50,000 (for former employees) from Form W-2, box 12, code N. If you have more than one Form W-2, add the amounts in box 12, codes B and N, of all your Forms W-2 and enter the total here. If you are filing a joint return, also include these amounts, if any, from your spouse's Form(s) W-2. However, don't include any amounts reported on Form W-2, box 12, codes B and N, for uncollected RRTA Medicare tax.
Note.
Both Medicare tax and Additional Medicare Tax withholding are reported together on Form W-2, box 6.
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