I am not actually sure how much, if at all, the Ory user auth has anything to do with the HIPAA data. I guess the idea is that medical professionals will access our system and, through that access, they will be able to see HIPAA-protected medical data.
In the first iteration, at least, I don't think that patients themselves would have accounts or data that lives in Kratos... However, if there was some sort of issue that made it so people could authenticate as the medical professionals, then all the patient data would be then at risk, and that would be very bad.