I think Turbo Tax did not correctly enter the amount from my W-2 into Line 19 on Form 8959 "Medicare tax withheld from Form W-2, box 6." Can I correct this myself?

It appears Turbo Tax took an amount from box 12 with code "N" for "uncollected" Medicare tax.  It seems like an "uncollected" amount should not be reported as withheld.