[nradov]

The HL7 Da Vinci Project has defined modern FHIR based standards for many interactions between payers and providers. Some of these standards are now incorporated into CMS/ONC interoperability rules.

https://www.hl7.org/about/davinci/

[thallium205]

Vaporware.

[nradov]

Multiple vendors have literally shipped products which implement those standards. They are being used to production today.