Mass. Gen. Laws ch. 175 § 4E
No insurer engaged in writing private passenger motor vehicle insurance in the commonwealth shall, in connection with underwriting of said insurance, refuse to issue or renew a private passenger motor vehicle insurance policy or bond based on the ownership or operation of a private passenger motor vehicle based upon credit information, including, but not limited to, a numerical credit-based insurance score or other credit rating of an applicant or insured; and provided, that no insurer shall file rates for private passenger motor vehicle insurance, under chapter 175E, based upon credit information, including, but not limited to, a numerical credit-based insurance score or other credit rating of an applicant or insured. Nothing in this section shall be construed to restrict any insurer from obtaining or using its own payment history information or information contained in an insurance claims history report, a motor vehicle or driver history report or any other report from the registry of motor vehicles or its out-of-state equivalent.
Mass. Gen. Laws ch. 175, § 4E