The first thing you need to do is to seek medical treatment if necessary for your injury or illness. Keep in mind that if your employer has a list of at least six providers for you to choose to seek initial treatment from, then you must seek care from one of the providers on the list. You must also notify your employer of your injury. Pennsylvania workers’ compensation law requires you to give this notification within 120 days; failure to do so can result in you losing benefits. For occupational illness or disease, you have a time limit of 300 weeks after the last date of occupation in the occupation where you were exposed to the hazard, and you must file a petition for benefits no later than three years after the illness occurs.