Do I have to live in US to work as a medical Transcriptionist ?

I live outside the US , and I want to start my career as a Medical Transcriptionist . I have an excellent Medi9cal background, with resonable spelling & grammer capabilities. My question is : Should I live in The US to work as a Medical Trascriptionist ? Or, simply , I can receive and send the requested information via the web , working frm home , anywhere, worldwide. Please advise