Can my employer cancel my health insurance retroactively?

Question Details:

Upon transfer from one job site 09/30/09 to another 10/05/09, I was the victim of an accident. Not job related in the days between in which I sustained a broken leg. Upon getting out of the hospital I informed my job of the incident, in turn I received a layoff. Due to the fact I would not be able to work. I call the insurance company upon getting home from the hospital and they informed me as of that date, 10/12/09, the insurance is good. 3months later I received a letter stating that my insurance had been cancelled 10/02/09 by my job. Is this possible? If I was to report to a job site 10/05/09?

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