Unless otherwise determined by the Commissioner, for the purposes of M.G.L. c. 176J, § 6 and M.G.L. c. 176O, § 21, the MLR of a Health Benefit Plan shall be calculated and reported in accordance with the current NAIC methodology for calculating and reporting MLR and with reference to federal guidance. When calculating MLR, a Third-party Administrator, pharmacy benefit manager or other similar entity shall perform its calculations utilizing data from the Health Benefit Plans it administers in the Commonwealth, and, if applicable, aggregate such data.
211 CMR, § 147.03