What Okta API allows us to authenticate a US-based healthcare provider against national directory?

I am looking for any Okta API that would allow our system to authenticate any US-based healthcare provider.

Okta Orgs have the ability to register external IdP sources. There needs to be cooperation with these IdPs to setup the integration.

There is also a number of built in connectors for some providers that you could install. Additional steps will be needed for each provider.