Workers' Compensation
If you are injured at work, then your rights and responsibilities will be controlled by Pennsylvania’s Workers’ Compensation law. The Department of Labor periodically puts out a brochure that gives a broad oversight of the law and answers common questions. This can be found by using your favorite search engine to look up LIBC-100.
For more complex questions, you should consult a lawyer, especially if your claim has been wrongfully denied, or if the insurance company has filed a petition against you. The other side is always represented by a lawyer who does not have your best interest at heart, so you should have a lawyer protecting your rights.