Yes, you may still deduct this cost if you are itemizing, and if your total medical expenses exceed 7.5% of your Adjusted Gross Income (AGI). You're doing plenty of math on your own calculating the excess cost, so I would suggest entering this in addition to your other itemized deductions and letting TurboTax determine if it will lower your tax bill.
The calculation example you gave seems like a perfectly reasonable way to determine your excess cost.
Enter the excess cost as a medical expense in any of the categories that makes sense to you. TurboTax asks you various categories to help you remember to capture all of your expenses, but they are added together for your tax return.
Don't forget, too, that you can include mileage driven to go to medical appointments as well in this section of TurboTax. Sometimes those little things add up in the end!
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