Are Health Insurance Deductible?
Well, the IRS rules are that "if you're an employee and your health insurance premiums are paid under a cafeteria-plan arrangement, then these are pretax dollars and would not count as a medical expense in reaching the 7.5 percent of AGI"
In other words, since the medical premiums paid under a cafeteria plan are not considered wages to you (they are not included in your Form W-2), you can't double dip by claiming a deduction. (Source IRS Publication 502)
If, however, you are not part of cafeteria-plan arrangement, and you are actually paying for these premiums out of your own pocket through payroll deduction, then, these premiums paid would be counted as a medical expense in reaching the the 7.5% of AGI.
In other words, these premiums paid by you should really be included in Box 1 of your W-2, and in these circumstances, they would be deductible on Schedule A.