OpenDDX is attempting this:
https://github.com/openddx
Oddx-arch's repo explains this thoroughly:
https://github.com/openddx/oddx-arch/wiki/OpenDDX:-an-open,-distributed-database-of-disease-symptom-observations
concept document (google docs):
https://docs.google.com/document/d/1T05Ao-7uVtOW0rjn_qZray9DK5VtJiIoZ7aU7Q6tA8k/edit#heading=h.xlsnjbxwmwpx

to clarify, I know they are attempting it, not sure what they've accomplished/if its a solution here....

OpenDDX (Open disease x symptom data) is a project "about creating an open, reliable, global database that associates symptoms with diseases, for the good of everyone."
http://openddx.net/

Project on GitHub:
https://github.com/openddx

Oddx-arch's repo explains this thoroughly:
https://github.com/openddx/oddx-arch/wiki/OpenDDX:-an-open,-distributed-database-of-disease-symptom-observations

concept document (google docs):
https://docs.google.com/document/d/1T05Ao-7uVtOW0rjn_qZray9DK5VtJiIoZ7aU7Q6tA8k/edit#heading=h.xlsnjbxwmwpx

to clarify, I know they are attempting it, not sure what they've accomplished/if its a solution here....