Mass. Gen. Laws ch. 118E § 10O
For the purposes of this section, the following terms shall have the following meanings unless the context clearly requires otherwise:-
"Community-based acute treatment", 24-hour clinically managed mental health diversionary or step-down services for children and adolescents that is usually provided as an alternative to mental health acute treatment.
"Intensive community-based acute treatment", intensive 24-hour clinically managed mental health diversionary or step-down services for children and adolescents that is usually provided as an alternative to mental health acute treatment.
"Mental health acute treatment", 24-hour medically supervised mental health services provided in an inpatient facility, licensed by the department of mental health, that provides psychiatric evaluation, management, treatment and discharge planning in a structured treatment milieu.
The division and its contracted health insurers, health plans, health maintenance organizations, behavioral health management firms and third-party administrators under contract to a Medicaid managed care organization or primary care clinician plan shall cover the cost of medically necessary mental health acute treatment, community-based acute treatment and intensive community-based acute treatment and shall not require a preauthorization before obtaining treatment; provided, however, that the facility shall notify the carrier of the admission and the initial treatment plan within 72 hours of admission.
Mass. Gen. Laws ch. 118E, § 10O