I received a tax refund check from my health insurer. Is it taxable income or does it reduce the amount of my insurance premiums on my itemized deductions?

I received an answer that it is NOT taxable income but since I itemize I need to reduce the amount of health insurance premiums I deduct.    I wanted to clarify that the check I received was due to tax reform and from tax credits for my health insurance company.  It is NOT for reimbursement of medical bills I paid. 

Is it still NOT taxable income, and I still need to reduce the amount of my health care deductions for the amount of the tax refund?     Thanks