I got an answer to my email. We need to be using a 2014 certified emr, which we are. The core requirements are essentially the same but are now reduced to 10. Here is the link I was sent by John Erickson at ac. I found it helpful.

https://www.cms.gov/Regulations-and...ms/Downloads/Stage3Overview2015_2017.pdf

I think when we log in for attestation it will be a combination of numerators and denominators and questions...like secure messaging just being yes or no

I hope the link works
Nancy