Mass. Gen. Laws ch. 176O, § 7
(a) A carrier shall provide to at least one adult insured in each household upon enrollment, and to a prospective insured upon request, the following information:
(7) a statement:
(b) A carrier shall provide all of the information required under section 6 and subsection (a) of this section to the office of patient protection in the health policy commission and, in addition, shall provide to said office the following information:
(5) a report detailing for the previous calendar year the total number of:
(iv) mental health or substance use disorder claims denied by the carrier; and (v) medical or surgical claims and mental health or substance use disorder claims denied by the carrier because: