In Louisiana, workers injured on the job can choose their own doctor for treatment, although your employer and/or insurer may not necessarily want you to. For example, your employer might give you a printout of doctors it has "approved."
That said, the emergency room is where you might get your first recommendation, from ER personnel. If your injury did not require you to go to the ER, perhaps your employer or primary care physician made recommendations. No matter what, though, state law gives you the power to choose your own doctor for treatment. This choice could end up even more important than you realize.