I have a non resident NIE dated from May 2009 and have used this for any admin purposes up until a few weeks ago when I went to register with my local health centre. They pointed out that my NIE was out of date and that I would need to renew it in order to get a medical number from them.
So, today I went to the police office in Velez Malaga (where original is from) didn't get beyond the person at the door who gives out the tickets as I was too late but I did check with him I had all I needed for a return visit. He informed me that my NIE was valid until May 2014 - 5 years.
As usual in these situations, who do you believe???

The medical centre won't issue a medical number until I renew NIE, police say it doesn't need renewed.
I have searched online for the answer to this with no joy.
Any one else renewed their's recently or have any relevant info?