Anyone know of a Post-master's certificate program

Anyone know of a program that offers a post-master's certificate for NP (preferably adult or acute) that is online, that counts the credits of completed CNS course work? I know that there are some differences in CNS versus NP training, but to have to repeat 20-30 credits. I don't think there is that much of a difference. I could be wrong.

In taking this new job as a "NP", I don't have to return to school since in my state a CNS is recognized no differently than an NP- but I would like to, in case title protection, legislation or medicare/insurance billing gets a little stricter. Any help would be greatly appreciated.