Here is Optum's policy: https://www.providerexpress.com/content/ope-provexpr/us/en/Important-upates.html

Optum is covering telehealth across the board, but you need to complete this attestation: https://www.providerexpress.com/content/ope-provexpr/us/en/clinical-resources/vv-tmh.html

Optum has a list of acceptable platforms for delivering telehealth: PDF It includes doxy, VSee, Zoom & GoToMeeting, amongst many others.