Are you trying to enter the health insurance premium on Schedule A (Itemized Deductions)? Normally, you cannot deduct the cost of health insurance premiums paid by you or by your employer, because they were already removed from your income on your W-2. The health insurance premiums are shown in box 12 with code DD - this includes both what your employer paid and what you had withheld to cover the premium.
Are are you referring to something else?
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