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's list of acceptable platforms for delivering telehealth [PDF] This may be rendered obsolete by the governor's executive order forbidding payers from limiting acceptable platforms. In any event, the list includes doxy, VSee, Zoom & GoToMeeting, amongst many others.