Mass. Gen. Laws ch. 175 § 162C
No insurer issuing or delivering in the commonwealth either motor vehicle policies as defined in sections thirty-four A and thirty-four O of chapter ninety or homeowner insurance policies insuring individuals against risks of loss to personal dwellings or the contents thereof or the personal liability pertaining thereto, shall demand or make mandatory upon any agent licensed in the commonwealth any system of direct billing to the insured by the insurer with respect to such policies unless such system shall be approved, accepted and endorsed by any such agent in writing on a form prescribed by the commissioner.
No insurer issuing or delivering in the commonwealth either motor vehicle policies as defined in sections thirty-four A and thirty-four O of chapter ninety or homeowner insurance policies insuring individuals against risks of loss to personal dwellings or the contents thereof or the personal liability pertaining thereto shall, with respect to such policies, cancel an agent's book of business with such insurer in its entirety or in part following decision by said agent not to accept a direct billing proposal advanced by such insurer, if such cancellation is attributable to said decision not to accept a system of direct billing to the insured.
Mass. Gen. Laws ch. 175, § 162C