Yes, Supplemental Medicare Health Insurance premiums are deductible. (of course they will only be deductible when over 7.5% of your AGI and you Itemize Deductions)
In the desktop versions, click on the Federal tab and then Deductions & Credits along the top.
Scroll down to Medical (first click SEE ALL if necessary)
Click Start for the last choice of that section titled "Medical Expenses"
Continue through the screens to get to "Medical Travel" this is where you enter the miles
The screen that follows Medical Travel is "Insurance Premiums" this is where you enter the Supplemental Health Premiums.
