If you don't hold the full medical degree to validate in Arg, you will most likely have to start from zero. If you do hold the degree and no experience ( clinicals ) you will have to do internships ( 3 years in Arg for general practitioner ). Only then you can apply for a specialized internship. Depending on where you have studied, validating your degree will be more or less difficult. Spanish will be tested if it is not your first language as well. An Arg. doctor with a specialty has usually studied for 6 years and hast at least 3 years of internship in a specific field.