The initial medical is issued by an Aero Medical Center (AMC) and is valid for a period for 5 years (regardless of age and class). Meaning during this 5 years period the medical can be renewed by any Aviation Medical Examiner (AME) how is qualified to do so. Usually an active pilot is not affected by this time limit because he needs to see an AME on a regular basis. But if you haven't been flying for 5 years (meaning you haven't been to an AME and your medical lapsed, as well as your pilot license) then you have to go to an AMC again to get a new medical. Usually the country which issued the medical is also the issuing country of your pilot license, you should tell your flight school or the examiner that you already hold an EASA Medical issued by another EASA country.
Last edited by Transsonic2000; 28th Sep 2014 at 14:30.