You misunderstand. We only have a degree of interoperability for patient records due to federal regulation. Regulation in that area actually helps competition.
https://www.cms.gov/priorities/burden-reduction/overview/int...
https://www.cms.gov/priorities/burden-reduction/overview/int...
Lack of health care records interoperability (locks patients into a system).
Much of the well-intended regulation around healthcare ends up getting perverted to prevent competition.