"I AUTHORIZE [...] having information available as to diagnosis, treatment and prognosis with respect to any physical or mental condition and/or treatment of me or my dependents and any other non-medical information of me or my dependents to give my employer, third party administrator, my third party carrier or its legal representative, any and all such information."

I think this sounds way too all-inclusive. I definitely think you are doing right to question it. I have no legal training or experience though.