I'll note that there are (possibly out of date) estimates at the bottom of the Stage III page of ~31 developer months of work to be fully ready for Stage III and an estimate of $22k to cover the cost of certification testing. I suspect the testing hasn't gotten cheaper in the past 2 years, and I don't know how much developer effort has gone into MUIII.
On a quick scan (the spreadsheet file was 300MB and it looks like I wasn't able to load everything on my computer at work), there are at least 300+ OEMR attestations (this is the non-profit organization that represents OpenEMR for MU certification).
Will plan to look into this further and thanks again for pointing this out.
I'll note that there are (possibly out of date) estimates at the bottom of the Stage III page of ~31 developer months of work to be fully ready for Stage III and an estimate of $22k to cover the cost of certification testing. I suspect the testing hasn't gotten cheaper in the past 2 years, and I don't know how much developer effort has gone into MUIII.