How to find if a practitioner is in network for the patient coverage plan?

How to find if a practitioner is in network for the patient coverage plan?
Where we could find the list of networks that a Practitioner is a part of?

There’s guidance here: HL7.FHIR.US.DAVINCI-PDEX-PLAN-NET\Home - FHIR v4.0.1
It’s targeted to the U.S. environment, but the general modeling should be applicable elsewhere.