The code is actually correct per this site but if you e-filed your return, the IRS just needs you to send in an updated copy of Form 5695.
You can print the form directly from TurboTax. Then, follow the instructions on the IRS notice to send the completed updated form to the IRS. If you are using TurboTax Desktop, make sure you check for updates first by going to the top menu, and selecting Online, then Check for updates.
How do I get a PDF of my return
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