Medical insurance employer requirements. Is it the responsibility of the employer to provide waiver?

I began working for my current employer 14 months ago. After four months I approached the human resource director and questioned him on the medical insurance I was told I would receive upon hire. At that time I had received no enrollment forms or waivers. I was told that I was outside my ninety days and that i would have to wait for open enrollment, consequently leaving me uninsured. In August of this year I had a major heart attack resulting in a $30,000 bill. Was my employer negligent according to the law, in not delivering the appropriate enrollment information in a timely manor?