Hello @nigelst
Welcome to the forum and the OpenEMR community!
As a matter of fact several years ago I saw OpenEMR used (may still be for that matter) to do precisely what you propose: manage a health plan. I do not know if the plan is still in business; haven’t heard of the major players for a long time.
This was before FHIR, and it required major customization in data collection forms but that was managed with the native LBF and Nation Notes features, as you mentioned.
I don’t remember if that application connected to an HIE but OpenEMR does have the basic background capabilities to do that; the native portal provides most of the other features to deal with your planned modifications.
Don’t know how familiar you are with OpenEMR’s features or if you’ve seen the OpenEMR wiki yet. But that’d be a good place to see much of what it can do and how much you’d need to mod it to do what you want. It might be helpful to start here:
Then come on back here with any questions you come up with.
Best- Harley