Availity vs. NationalERX

tonderin wrote on Sunday, May 22, 2011:

Can someone explain, please, as to why pick one over the other?  I’ve read that Availity EDI has a free e-prescribing product, called CorePrescribe, so if Availity EDI can serve as both the electronic clearing house as well as a free e-prescribing portal, is there still an advantage of using the NationalERX product for e-prescribing?
The same goes for Microsoft HealthVault vs Google Health, what is the advantage of using one over the other?  What is this software used for that OpenEMR can not provide?
Thank You