"Lots of systems" is a stretch, only a few do. In fact, "support" is a stretch. Most EMRs (Cerner, Epic etc) only support HL7 as much as it gets them their CMMI

"Lots of systems" is a stretch, only a few do. In fact, "support" is a stretch. Most EMRs (Cerner, Epic etc) only support HL7 as much as it gets them their CMMI / Promoting Interoperability certifications which are not relevant for actual use. That being said, it is JSON but much worse