can my employer cancel my medical insurance while I am on workman's comp?
No. Employees injured on the job are not supposed to be discriminated against, although it happens often, sometimes just because of ignorance of the law and failure to undnestand when it applies. Technically, you are suppose to be treated as though you had continued working. The employer must continue its payment into the medical plan, as must you. You earn the same seniority, pension, wage increase, vacation, sick leave rights as if you were still at work.