Mass. Gen. Laws ch. 176B § 4V
Any subscription certificate under an individual or group medical service agreement, except certificates providing supplemental coverage to Medicare or to other government programs, delivered, issued or renewed by agreement within or without the commonwealth shall provide, as a benefit for all individual subscribers or members within the commonwealth and all group members having a principal place of employment within the commonwealth, coverage for the cost of human leukocyte antigen testing or histocompatibility locus antigen testing that is necessary to establish bone marrow transplant donor suitability. The coverage shall cover the costs of testing for A, B or DR antigens, or any combination thereof, consistent with rules, regulations and criteria established by the department of public health pursuant to section 218 of chapter 111.
Mass. Gen. Laws ch. 176B, § 4V