medical insurance deductions for self employed

[JudyC14]

My husband is self employed.  We are both retired.  We have a medical supplement insurance to our Medicare that we have been able to purchase through my former employer as a retired employee.  Is that considered health plan subsidized by employer and not eligible to take the premiums we pay as a deduction?  We pay monthly premiums for medical and dental insurance converage. I know we can take the Medicare Part B.