That number is the total of the numbers you entered either in the interview or on the Medical Expenses Worksheet (Medical Wks). You should go back and edit your entries in the interview or on the Medical Expenses Worksheet.
In the TurboTax Desktop software, you can override (replace) a calculated figure in Forms Mode. This feature is unavailable in TurboTax Online.
Important: Under normal circumstances, you shouldn't have to override anything. Returns that contain overrides cannot be e-filed and may not be covered under our 100% Accurate Calculation Guarantee.
How do I override an entry?