Governor's Telehealth Coverage Executive Order, March 15, 2020: PDF at mass.gov. Crucial text from the Order:

[Payers] are hereby required to allow all in-network providers to deliver clinically approrpriate, medically necessary covered service to members via telehealth. […]
[Insurers] shall not impose any specific requiresents on the technologies used to deliver telehealth services (including any limitations on audio-only or live video technologies.)
The GIC and all Carriers shall ensure that rates of payment to in-network providers for services delivered via telehealth are not lower than the rates of payment established by the Carrier for services delivered via traditional (i.e., in-person) methods, and shall notify providers of any instructions necessary to facilitate billing for such telehealth services.

MassHealth

BCBSMA - Blue Cross Blue Shield of MA

Optum

Aetna

Cigna