Do I have to sign a medical release form for the workman’s comp insurance company that covers my injury?

Comp. carriers usually subpoena all medical records, although they could ask you for a release. I am not sure if they have an absolute right to get a release from you but since they have a right to all medical records related to injury or disability to the same or similar parts of the body, why fight them? It implies you are hiding something. You should demand that it be limited to the same type of disability or parts of the body, but unfortunately Dr. Offices and Hospitals normally give the copy service all the records they have.