Who is reimbursing you? A former employer? Current employer? Such payments on your behalf may or may not be taxable income, depending on who is paying and why. We need more information.
Separately, if the reimbursement is tax-free for some reason, you can't deduct your premiums as a medical expense. But if the reimbursement turns out to be includable as taxable income, then you can still list the premiums as a deductible medical expense.
