Mass. Gen. Laws ch. 152, § 65C
(1) All losses incurred under policies issued to employers under section sixty-five A shall be equitably distributed among all insurers authorized to transact and transacting workers' compensation insurance in the commonwealth. Such distribution of losses shall be effected through a reinsurance pool constituted by and comprised of all insurers writing workers' compensation insurance in the commonwealth. No insurer, as defined in subparagraph (7) of section one, and including any insurance company, reciprocal or interinsurance exchange which has contracted with an employer to pay the compensation provided for by this chapter, shall be authorized to write or to continue to write workers' compensation insurance in this commonwealth unless such insurer is a member of the reinsurance pool established herein.
The commissioner of insurance shall designate a rating organization, duly qualified under section fifty-two C, to administer the reinsurance pool in such manner as shall be approved by the commissioner. Such rating organization shall adopt a plan of operation, which shall be submitted for approval to the commissioner of insurance and, upon approval by the commissioner, shall be binding upon all members of the reinsurance pool. If a rating organization fails to adopt a plan of operation within a reasonable period of time of its designation by the commissioner, the commissioner may promulgate a plan of operation for the administration of the reinsurance pool. Such plan of operation shall contain rules and procedures for the allocation of losses of the reinsurance pool among its members consistent with this section, and shall otherwise be consistent with law. Amendments to such plan of operation may be made by the rating organization designated by the commissioner or may be made at the direction of the commissioner upon reasonable notice to such rating organization and after a hearing. All amendments to the plan of operation proposed by the rating organization designated to administer the reinsurance pool shall be submitted for approval to the commissioner of insurance.
(2) Notwithstanding the provisions of subsection (1), in order to reduce the number of risks in and the volume of premium in the reinsurance pool the commissioner shall establish and maintain cost containment programs in the reinsurance pool, including a program requiring service carriers to establish and maintain a comprehensive employer safety assistance program, and may take any or all of the following actions: