What the other sites are most likely referring to is that only your Medical Expenses in Excess of 7.5% of your AGI can be deducted on your Schedule A. (Last year it was 10% of AGI)
TurboTax automatically does the 7.5% of AGI calculation and reduces your deduction accordingly.
Please check out the TurboTax FAQ below for more details:
https://ttlc.intuit.com/replies/3301457
