Will hiring company question positive drug test result with Rx?

It really depends on the position you are applying for. The company is not going to care that you take medication to control pain. But if you are going for a high-stress job, or a job that requires a lot of physical strain or long hours, the company is going to view your use of oxycontin as a risk. The medication could make you drowsy, and they have to protect themselves from any accident that could happen.