Is it possible a viral infection (coxsackie) in dec 2012 could be cause of idiopathic dilated cardiomyopathy diagnsd in june 2013? is it reversible?

Yes to both: Viral infection of the heart is relatively common and usually of little consequence. It can, however, lead to substantial cardiac damage and severe acute heart failure. It can also evolve into the progressive syndrome of chronic heart failure. Studies have indicated that viral infections can precepitate cardiomyopathy. It may be reversable with aggresive treatment. Take care.

Yes, and maybe...: Viral myocarditis is usually caused by influenza a or b in the winter and coxsackie a or b in the summer, but can vary. It is considered a "disease of thirds", a third of people get better, a third get worse and often die and a third become chronic. You are either in the first or third group. No treatment is known to cure it, it is mainly supportive treatment. It may still get better, icd needed?