A 1099-SA shows the amount distributed from your Health Savings Account during the year and is included as income until you enter the information on how much you actually spent for medical expenses.

After you enter the associated medical expenses, this should resolve.  Please see the TurboTax FAQ below for how to accomplish this:

https://ttlc.intuit.com/questions/3894040-where-do-i-enter-the-amount-for-1099-sa