I would think this is covered under his commercial policy. Whether he can request you pay the deductible is up to him and the company policy, if any.
Report it, cooperate, and then talk to him to see what justification he has for this. Realistically, you're at his mercy most likely.
If you were hurt, you probably have a workers' compensation case.
Stephen L. Hoffman
Law Office of Stephen L. Hoffman LLC
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I would think that as an agent of the company, working on behalf of the company, he would not be able to make you pay the deductable personally. Now, that said, arguing with your boss may create problems.