authorization for work. comp. carrier

[domks]

My employer's carrier is "investigating the claim". Yesterday I got a form that I am to sign. This form authorizes the carrier to request "all information from physicians, mental health care providers, insurance companies, consumer reporting agencies, employers, and any nonmedical information about me". Why would they need anything more than medical and employer information? Is this legal? Has anyone else ever had to sign such a thing for work. comp.?