No. You take your AGI (1040 form line 38) and then 7.5% of that. Subtract the answer from the medical expense and enter that as the exception.
Example: Line 38 = $75,000. 75000 X .075 = 5625,
Medical expenses are $6,600,
6600 - 5625 = 959.
$950 would be an exclusion.