This was just reported in an IHE-Europe news letter. I wanted to stress it here as I am finding many people do not understand that IHE has many Implementation Guides (IHE-Profiles) that leverage FHIR. IHE has published 32 Implementation Guides that use FHIR.
There is very active implementation and testing of these at IHE-Connectathons. This graphic brings the message home
And yet, that graphic is representative of the IHE-Europe Connectathon. Last week was the IHE-USA Connectathon, so this grows even more. Here are my other FHIR articles.