Welcome to the scam known as "Workers Compensation."
The insurance company does not need a "good reason" to cut off your benefits. All they need is a process that is favorable to them. Lobbying by the insurance industry has resulted in laws written as they wish. These laws provide them ample opportunities to stop providing you with medical care.
They are trying to get rid of you by cutting you off financially. It works like this:
1. The insurance company cuts of your benefits for some made up reason.
2. Because you are not physically able to do the job you were hired to do, your employer fires you.
3. Because you have no job and no income, you can't afford medical insurance.
4. Without medical insurance, you have no evidence to take into court and the insurance company increases their chances of winning.
Contact an attorney immediately. Find one that specializes in workers compensation. You should know that Sedgwick Claims Service is one of the worst offenders of this. I would be interested in knowing what company you work for as there are a couple of the big box stores that are in some fairly serious trouble for this type of thing. Feel free to email if you like.
Unfortunately, there are many people that will assume that those in positions of authority are of such high moral character that they will not scheme and lie. You see that in some of the comments that have been written here. Try to ignore this nonsense.

